Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Chain hitting front derailleur

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Chain hitting front derailleur

Old 12-24-13, 09:26 PM
  #1  
chschen
Junior Member
Thread Starter
 
Join Date: Feb 2012
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Chain hitting front derailleur

Hi, we are trying to assemble the Mercier Galaxy SC2 (http://www.bikesdirect.com/products/..._al_xi_sc2.htm) and have hit upon a little problem with our front derailleur. We had to adjust the height of the derailleur and also make it parallel to the cassette. But, in the lowest gears and the highest gears, the chain hits the derailleur, despite us adjusting both limiter screws. Adjusting one may fix the problem on one side (e.g. in highest gear), but then it makes the problem worse on the other side (e.g. in lowest gear). Any ideas on how to fix this? Also, I noticed the cable tension is really tight. Does this affect anything? Should we loosen it and readjust everything?

Thanks in advance for your help.
chschen is offline  
Old 12-24-13, 10:06 PM
  #2  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 214 Times in 178 Posts
Not there , cant see, .. maybe your Bike shop nearby can help.

STI FD's scrapes in the cross chain gears , just avoid them ..





Me? I stick to friction shifting, so, scraping sound? I just move the lever ..

Last edited by fietsbob; 12-25-13 at 12:48 PM.
fietsbob is offline  
Old 12-24-13, 10:11 PM
  #3  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Limit screws don't set the position of the cage. the cable does.

I suggest you watch a few tutorials on adjusting front derailleurs until you have a good sense of the process, then try again.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 12-24-13, 10:14 PM
  #4  
zandoval 
Senior Member
 
zandoval's Avatar
 
Join Date: May 2010
Location: Bastrop Texas
Posts: 1,795

Bikes: Univega, PR-10, Ted Williams,UO-8, Puch, PHLE, UO-18 Mixte

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
little more info here is needed - name the derailuer, hitting upper part, lower part, right left, what gears, how big the casset, how many gears on the crank, pics if possible...
zandoval is offline  
Old 12-24-13, 10:33 PM
  #5  
chschen
Junior Member
Thread Starter
 
Join Date: Feb 2012
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by zandoval View Post
little more info here is needed - name the derailuer, hitting upper part, lower part, right left, what gears, how big the casset, how many gears on the crank, pics if possible...
Derailleur: Shimano FD-2303
It's hitting right and left
Cassette is SUNRACE CSR 12-25T, 8 speed / SUNRACE 8 speed (24 Speed total)
Crank has 3 gears

I will take some pictures soon and post them.
chschen is offline  
Old 12-24-13, 10:36 PM
  #6  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,654

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1731 Post(s)
Liked 45 Times in 32 Posts
There is no linkage between what the limit screws do. One only can effect the outer travel as the other can only change the inner movement. Yes, the cable tension is important. And the front sprockets are usually called chain rings.

So lets get down to basic set up. The first thing i do with Ft ders is to not use the shift lever to move the der during initial set up. I do this by pulling on the cable part way along the down tube. why? Because this separates the "raw' adjustment of the ft der from the lever's built in cable moving function. Set the ft der at the right height off the large ring when the cage is moved so it's outer plate is even with the large ring. The outer cage plate's lower edge is usually about 2-3mm's above the large ring's teeth. Then rotate the der/cage on the frame so it's about parallel to the rings. This is one of the set up aspects that often needs trial and error to get the best position. But this fine tuning starts after the initial set up. Attach the cable to the anchor bolt on the right side of the bolt (The failure to do this correctly will cause all kings of rubbing issues). Then shift into the large cog (easy gear) in back and place the chain on the inner ring. Turn the inner limit screw so the inside or the inner cage plate JUST clears the chain. Shift into the smallest rear cog (high gear) and "shift" (and by this I mean pedal and pull the ft cable by hand to move the ft der outward) onto the large ring. Turn the outer limit screw so the inside of the outer cage plate JUST clears the chain.

Now begins the fine tuning. I still will do the der moving and fine tuning by pulling the bare cable, the coordination with the shift lever waits for now. Shift the rear back into the large cog. Try shifting (pedaling of course) the ft up and down onto and off the middle and small rings. Note how easy the up shift is and how quick the drop down to the small ring is. Shimano ft shifting with STI levers is so abrupt that to prevent overshifting down (and dropping the chain onto the BB shell) you might have to limit the der's inner travel so much that the chain has a slight rub when on both inner cogs (large rear and small ft). Next move to the rear small cog and shift from the ft middle to large and back (yes this means that you'll be holding the cable enough to not shift onto the small ft). What i watch for is how the chain rides up on the large ring's teeth before settling down into them. When i look down from above (my head will often touch the seat) I can see the chain's flexing and side to side movement during the up shift. You want to have a complete up shift with out dropping off to the outside. (Again with STI you sometimes have to accept a BCH of rub when in highest gear to prevent overshift and chain drop). This is the step where ft cage rotation is most sensitive. If you try to slightly change the cage rotation (and parallelness to the rings) then you have to back to the adjustments of the small ring before you can go back to the adjustments of the large ring travel.

You can see how there can be a lot of back and forth between cage rotation and inner/outer limits. Of course with experience this process goes quickly and without it can be frustrating. Especially if you forget to reestablish the inward movement before continuing the outer movement adjustments. Once you think both "ends" of the ft shifting are equally good then move the chain to a Central rear cog and repeat the ft shifting, but now across all three rings.

In an ideal world you won't shift onto the granny ring unless you are already half way up the rear cogs and likewise won't shift onto the large ring unless you're off the easy rear cogs. But the middle ring should hopefully be able to be used with all the rear cogs.

After all this trial shifting by using the cable only and the fine tuning to get the best shifting performance across the ranges now it's time to get the shift lever in play. To use the shift lever before this point often only confuses and hides issues with the basic der set up and fine tunings. Go back to the start with the rear large cog and small ft ring. Reattach the cable (note proper manor) and while tightening the anchor bolt pull the cable tight (of course the lever should be in it's lowest position). Now shift the lever to the middle position while pedaling and release. The chain should climb up onto the middle ring. If your lever has a middle position trim feature the der will likely have a touch of inner cage plate rub. Trimming the lever BUT still maintaining the middle shift position should eliminate all (or the vast majority) of the rub. Many riders don't understand the trim function or can feel it. THIS IS IMPORTANT TO LEARN HOW TO DO. If there is a lot of chain rub after trimming the lever then the cable needs to be slightly looser. If no rub then tighten the cable till is almost does rub. This tension adjustment can be done with a casing barrel adjuster or with the cable anchor bolt. But keep in mind that allowing the cage to move inward now will also keep the cage from moving outward for the large ring's shift. So next shift the chain into the smallest rear cog and try lever shifting the ft onto the large ring. If the cable is tight enough then the shift will go well and little/no rub will be present. Again there might be a trim feature for the large ring so DO UNDERSTAND TRIM.

If you were able to shift the ft der with only pulling the cable well then you should be able to fine tune the cable tension so that with the lever controlling the der movements the same good shifting can be had. Trying the ft shifting with the chain in the small, middle and large rear cogs again before deciding that you've gotten things ASAP.

All of this presumes that all the components are compatible and of the same brand. Wait, did i say the same brand (like crankset or chain)? Yes I did. Any deviation from the system that Shimano intended can cause a drop off of performance/increased rubbing/slower shifting. The off brands of parts will always claim otherwise, that they design to Shimano's spec. But Shimano will never agree to that.

As i said before there is a lot of back and forth then re base lining before going back to where you had to try something different. As the system wears in cable tension needs to be kept on top of. When tapered square cranks are retorqued on the BB spindle the limits and cable tension needs rechecking. If you shift under power (JAM SHIFTING) and don't know how to soft pedal during shifting that all these adjustments will not matter too much. Andy.
Andrew R Stewart is offline  
Old 12-24-13, 10:38 PM
  #7  
chschen
Junior Member
Thread Starter
 
Join Date: Feb 2012
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by FBinNY View Post
Limit screws don't set the position of the cage. the cable does.

I suggest you watch a few tutorials on adjusting front derailleurs until you have a good sense of the process, then try again.
The tutorial I was watching (https://www.youtube.com/watch?v=zLqrhFzW8s0) said that you adjust the limiter screws so that the derailleur is 1 mm from the chain. So it would seem to me that if the derailleur was hitting the chain on the left and right sides, adjusting the limiter screws might help with that. Am I wrong?

Do you have tutorials you recommend?
chschen is offline  
Old 12-24-13, 10:47 PM
  #8  
zandoval 
Senior Member
 
zandoval's Avatar
 
Join Date: May 2010
Location: Bastrop Texas
Posts: 1,795

Bikes: Univega, PR-10, Ted Williams,UO-8, Puch, PHLE, UO-18 Mixte

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You bet - The 2303 is a good derailuer for allot of travel - This is good - Take the cable off completely and use thumb pressure to get through all the gears - If it works then follow Stewarts instructions closely...

Enjoy yourself while your doing this - Remember its all fun...
zandoval is offline  
Old 12-24-13, 10:50 PM
  #9  
rekmeyata
Senior Member
 
rekmeyata's Avatar
 
Join Date: Sep 2010
Posts: 8,348
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 555 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Without being there is difficult to assess what's happening. I would have assume the bike should have left the Bikes Direct already adjusted for derailleur height because a pro set alignment block needed to be used to make sure the front gear was set properly for height. Like any front derailleur you need to put the chain in the largest rear gear and the smallest front chain gear before adjusting your low screw and that the clearance is no more than 0.5mm between the chain and the chain guide inner plate of the derailleur, then put the chain in the smallest rear gear and the largest front chain gear and adjust the high screw so that the clearance is no more than 0.5mm between the chain and the chain guide outer plate of the derailleur.

A bike shop will probably charge about $20 to do it, but if you take it in have them do a basic run through checking everything, it might cost you $40 to do that but worth the piece of mind. I would also contact Bikes Direct about the issue, they may reimburse you or the bike shop for any money you're out especially on the front derailleur issue.
rekmeyata is offline  
Old 12-24-13, 11:04 PM
  #10  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by chschen View Post
The tutorial I was watching (https://www.youtube.com/watch?v=zLqrhFzW8s0) said that you adjust the limiter screws so that the derailleur is 1 mm from the chain. So it would seem to me that if the derailleur was hitting the chain on the left and right sides, adjusting the limiter screws might help with that. Am I wrong?

Do you have tutorials you recommend?
Imagine your derailleur is an elevator, which hangs from cable. For safety there are switches at the top and bottom of the shaft to keep it from hitting the end. These can also be set to stop the elevator to stop in the right place at the top and bottom floors, but it's really the cable that determines the height of the elevator at each floor.

Likewise, the derailleur limits prevent overshifting beyond the chainrings, but the cage position depends on the cable. However on the innermost chainring the cable is slack so the inner limit also sets the cage for low, much as the lower elevator might set the basement stop position.

I hope that helps.

I can't suggest any single tutorial, but I always suggest watching a few. Sometimes something not covered well on one becomes clear on the second. The point is you want to have a sense of the job in your head, rather than simply following steps by rote.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 12-24-13, 11:32 PM
  #11  
chschen
Junior Member
Thread Starter
 
Join Date: Feb 2012
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wow, thanks for all that detailed, good information! We're going to give it a try and see what happens! Happy holidays, everyone.
chschen is offline  
Old 12-25-13, 10:01 AM
  #12  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 6,230

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 651 Post(s)
Likes: 0
Liked 46 Times in 42 Posts
Follow Andrew Stewart's instructions or this one: http://www.parktool.com/blog/repair-...ur-adjustments

When adjusting the low limit be sure not to leave more clearance than necessary; if you do you may find that you are running out of cable pull on the high end.

Merry Christmas!
dsbrantjr is online now  
Old 12-25-13, 10:59 AM
  #13  
BLYTZPK
Banned
 
Join Date: Dec 2013
Location: none
Posts: 101

Bikes: '78 Raleigh rebuilt to 21C...Redline Monocog cyclocross in steel redone to 8 spped trekker

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
clean your ear canals out so to ear the rrrrrrrrrrrrrr.....

screws should be set even....parks covers this right ? as if screws have 5 turns total set screws even at 2.5 turns from bottom.

deray gate set to the large ring should almost touch chain and so for the small ring...install a chain preventer on the seat tube.

but the deray's seat tube mounting position determines the gates total effectiveness in passing the chain thru as chain angle to rear cogs varies from 32 teeth to 14 teeth.

the gate/seat post mounting position should clear...when shifted to large ring...to the small rear cog...and from small ring to large cog when shifted.

and remeber...you can hammer and file.

when the system drrrrrrags in transit, loosen the clamp, turn the mount for immediate silence

Last edited by BLYTZPK; 12-25-13 at 11:00 AM. Reason: spel
BLYTZPK is offline  
Old 12-25-13, 11:32 AM
  #14  
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 477 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BLYTZPK View Post
clean your ear canals out so to ear the rrrrrrrrrrrrrr.....

screws should be set even....parks covers this right ? as if screws have 5 turns total set screws even at 2.5 turns from bottom.

deray gate set to the large ring should almost touch chain and so for the small ring...install a chain preventer on the seat tube.

but the deray's seat tube mounting position determines the gates total effectiveness in passing the chain thru as chain angle to rear cogs varies from 32 teeth to 14 teeth.

the gate/seat post mounting position should clear...when shifted to large ring...to the small rear cog...and from small ring to large cog when shifted.

and remeber...you can hammer and file.

when the system drrrrrrags in transit, loosen the clamp, turn the mount for immediate silence
Better to give no instructions at all than ones like the above, which are garbled, inaccurate, and suggest radical procedures (hammer and file) to a novice.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

Last edited by cny-bikeman; 12-25-13 at 12:13 PM.
cny-bikeman is offline  
Old 12-25-13, 11:45 AM
  #15  
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 477 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I don't know how you found that video but don't use it. He leaves a lot out, and anyone who talks about "tuning" brakes and "gears" is starting you off behind by using non-standard terms. That's also part of the lack of clarity in your original post. Rather than talking about "lowest/highest gears" you need to tell us the front/rear (chainwheel/rear cog) combo you are in when adjusting and when the problem occurs.

The low limit screw is set ONLY for the innermost front/rear combo, likewise the high limit is for the outer front rear combo. On both large and small chainwheels it is normal for rubbing to occur by the time you shift to the 8th cog away from the one where the adjustment is made - not all combos are necessarily useable.

I would echo the previous advice that you look and think about what you are doing, observe how things move and interact, rather than following rote instructions. As already mentioned, lots of resources available, most notably at sheldonbrown.com and parktool.com/blog. They will show up near the top of almost any Google search you do for repair procedures. Start though with a search for bicycle parts diagram, so that you can search using the right terms and communicate more clearly when asking questions.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

Last edited by cny-bikeman; 12-25-13 at 05:35 PM.
cny-bikeman is offline  
Old 12-25-13, 02:23 PM
  #16  
Duane Behrens
Senior Member
 
Duane Behrens's Avatar
 
Join Date: Mar 2010
Location: Minnesota and Southern California
Posts: 628

Bikes: Specialized Tarmac (carbon), Specialized Roubaix (carbon, wifey), Raleigh Super Course (my favorite), and 2 Centurion project bikes.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You've gotten plenty of advice here - both kinds - so I won't add a lot more except this: You yourself touched on the importance of initial cable tension, and you were correct. Attempts to "adjust" around an improperly tensioned cable will be frustrating at best. The first time I installed a FD, I actually wore out a cable getting that tension right. But when I DID get it right, the rest of the adjustments became responsive to my touch and tolerant of slight inaccuracies.

Watch the videos - they're helpful - but don't be afraid to start over by re-setting initial cable tension, then going through the steps again. Like me, you may not get it on the first try . . . but you'll get it.
Duane Behrens is offline  
Old 12-25-13, 07:56 PM
  #17  
cobba
Senior Member
 
Join Date: Aug 2006
Posts: 1,677
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 93 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
What gear combo is the chain rubbing?

Big front & big rear ?
Small front & small rear ?

8 speed gear combinations that Shimano doesn't recommend using:

Attached Images
File Type: jpeg
Shimano 8 Gear Drivetrain.jpeg (40.1 KB, 10 views)
cobba is offline  
Old 12-26-13, 05:25 AM
  #18  
migrantwing
Senior Member
 
migrantwing's Avatar
 
Join Date: Sep 2011
Location: UK
Posts: 496

Bikes: '07 Carrera TDF / 2011 Ghost Race Actinum 5000

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
Liked 3 Times in 2 Posts
Originally Posted by FBinNY View Post
Limit screws don't set the position of the cage. the cable does...
+1

Often overlooked and misunderstood
migrantwing is offline  
Old 12-26-13, 06:52 AM
  #19  
BLYTZPK
Banned
 
Join Date: Dec 2013
Location: none
Posts: 101

Bikes: '78 Raleigh rebuilt to 21C...Redline Monocog cyclocross in steel redone to 8 spped trekker

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
writing a post or instruction converting words to action is difficult. Instructions here are too dense.

moving the cage on the seat tube both radially, around the tube, and vertically for clearance before or after or during setting screws so the chain 'almost touches' ...

is not dense, just do it.

when you get there at that time or space then you can spin the cranks adjusting the screws so the chain moves onto outside or inside CR.

if you can't read it don't read it

where's the crit for 'screws are not interrelated ?
BLYTZPK is offline  
Old 12-26-13, 08:19 AM
  #20  
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 477 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BLYTZPK View Post
1. if you can't read it don't read it

2. where's the crit for 'screws are not interrelated ?
1. I comment on other members' postings when incorrect information is given, and especially if it may cause rather than cure problems.

2. I don't see those words on any post in this thread, so have no idea what you mean.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!
cny-bikeman is offline  
Old 12-26-13, 09:01 AM
  #21  
BLYTZPK
Banned
 
Join Date: Dec 2013
Location: none
Posts: 101

Bikes: '78 Raleigh rebuilt to 21C...Redline Monocog cyclocross in steel redone to 8 spped trekker

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by cny-bikeman View Post
1. I comment on other members' postings when incorrect information is given, and especially if it may cause rather than cure problems.

2. I don't see those words on any post in this thread, so have no idea what you mean.
rrrrrrrrrrrrrrrrrrrrrrr....
BLYTZPK is offline  
Old 12-26-13, 11:46 AM
  #22  
chschen
Junior Member
Thread Starter
 
Join Date: Feb 2012
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I think we were able to make the adjustments so that the bike works properly. It rubs a little on the extremes--biggest crank ring and smallest sprocket, biggest sprocket and smallest crank ring--but I guess that will happen? My husband tested it out yesterday on some big hills and thought it was fine. Thanks again for all your posts!
chschen is offline  
Old 12-26-13, 12:29 PM
  #23  
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 477 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It really should not rub in those combos, as they are the very ones that one uses to make the front derailleur adjustments. Please make sure brakes are properly adjusted and that everything is properly tightened.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

Last edited by cny-bikeman; 12-26-13 at 06:12 PM.
cny-bikeman is offline  
Old 12-26-13, 12:40 PM
  #24  
BLYTZPK
Banned
 
Join Date: Dec 2013
Location: none
Posts: 101

Bikes: '78 Raleigh rebuilt to 21C...Redline Monocog cyclocross in steel redone to 8 spped trekker

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
rrrrrrrrrrrrrr.....


almost there...look at the cage when chin rubs in large CR/small cog and small CR/large cog.

either twist the small CR/large cog screw 1/4 turn..pedal...does the chain fall off ? NO ?

if no then ad lines 8 and 14 thru 9...

If NO then does the noise cease ?

if not or before twisting the screw, look and think about the cage position as it relates to turning the cage with the seat post mount or raising or lowering the mount.

This is important, requires a little special reasoning.

If you can only eliminate 1 rub position then probably go for the small CR/large cog...

when do you use the large CR/small cog ?

move the cage around experimentally with the seat post mountjust to see what goes on there at the large CR...you know...

rrrrrrrrrrrrrrrrerk clang
BLYTZPK is offline  
Old 12-26-13, 01:01 PM
  #25  
gsa103
Senior Member
 
Join Date: May 2013
Location: SF Bay Area
Posts: 4,166

Bikes: Bianchi Infinito (Celeste, of course)

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 629 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by chschen View Post
I think we were able to make the adjustments so that the bike works properly. It rubs a little on the extremes--biggest crank ring and smallest sprocket, biggest sprocket and smallest crank ring--but I guess that will happen? My husband tested it out yesterday on some big hills and thought it was fine. Thanks again for all your posts!
That would be typical unless the derailuer has a trim adjustment (essentially a half-click).
gsa103 is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.