Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-19-14, 04:44 PM   #1
Kruzen
Junior Member
Thread Starter
 
Join Date: Jul 2014
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear cog

Hey folks, I'm new to the forum. I hope I can get an answer to a question. I have a Diamondback response that is a project bike. It is a 7-speed. Can I install a 9 speed rear chain rings and change the shifter as well? It seems difficult to find up-grade parts for a 7 speed.

Thanks
Kruzen is offline   Reply With Quote
Old 07-19-14, 04:56 PM   #2
Willbird
Senior Member
 
Willbird's Avatar
 
Join Date: Jun 2014
Location: Very N and Very W Ohio Williams Co.
Bikes: 2001 Trek Multitrack 7200, 2104 Fuji Sportif 1.5
Posts: 2,442
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Quote:
Originally Posted by Kruzen View Post
Hey folks, I'm new to the forum. I hope I can get an answer to a question. I have a Diamondback response that is a project bike. It is a 7-speed. Can I install a 9 speed rear chain rings and change the shifter as well? It seems difficult to find up-grade parts for a 7 speed.

Thanks
from my limited understanding a 7 speed cassette cannot go 8-9-10, but an 8 can go 9-10 (not sure about 11)

if I understand correctly the wheel needs re dished to go from 7 up.
Willbird is offline   Reply With Quote
Old 07-19-14, 08:32 PM   #3
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,371
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 77 Post(s)
It depends on the Free Hub body that's on it.
8-10 speed bodies are longer than 7 speed bodies to fit the extra cog(s).
However, some recent 7 speeds use an 8-10 speed body with a 4.5mm spacer added before the cassette is installed.
IF you have one of these, just remove the 4.5mm spacer and you are good to go.

The bad news is that most recent 7 speeds seem to use free Wheels instead of Free Hubs.

Freewheel or Cassette?
Bill Kapaun is offline   Reply With Quote
Old 07-19-14, 09:13 PM   #4
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Posts: 19,851
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Quote:
Originally Posted by Bill Kapaun View Post
That is the first order of business.

Then specific information about the actual parts you have.

P.s. Terminology: "Chainrings" are attached to the crankarm, as are the pedals. "Cogs" are on the back wheel, either as a cassette, or part of a freewheel.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike
Homebrew01 is offline   Reply With Quote
Old 07-20-14, 09:43 AM   #5
Miele Man
Senior Member
 
Join Date: Jun 2014
Bikes:
Posts: 1,487
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
If it's a Hyperglide cassette (lockring) and not a Uniglide cassette (smallest cog screws on) then you can use a 9 speed cassette IF you remove a cog and spacer. Some people remove the smallest cog as they don't need to high a gear - 11,12 or even 13 teeth cog but they keep the largest cog. Others remoce the largest cog.

If it's a Uniglide cassette and you have a Dremel type tool you can still use a number of Hyperglids cogs IF you grind the edges off of the large tabs so that it'll fit in the narrower Uniglide slot. You'll still need the smallest Uniglide sprocket to hold all the other cogs in place.

Sometimes you can use a bottom bracket lock ring instead of the smallest cog on a Uniglide cassette body to hold the other cogs in place. Just be sure to really, really tighten the lockring as the pedalling motion does not tighten it as the pedalling motion tightens the screwed on small Uniglide cog.

Cheers from Miele Man
Miele Man is offline   Reply With Quote
Old 07-20-14, 10:51 AM   #6
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: My War
Posts: 26,860
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 304 Post(s)
You can still get ef65 shifters at universal, niagara, etc. 7-sp cassettes and freewheels are still available many places. You can use any shimano 6,7,8,9 speed mtb rear derailleur, might wanna avoid rapid rise ones, though.
LesterOfPuppets is offline   Reply With Quote
Old 07-26-14, 03:28 PM   #7
Kruzen
Junior Member
Thread Starter
 
Join Date: Jul 2014
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hm, thanks, would purchasing a 10 speed rear wheel and new Derailuers and shifters?
Kruzen is offline   Reply With Quote
Old 07-26-14, 03:47 PM   #8
RoadGuy
Senior Member
 
Join Date: Jul 2014
Location: SoCal
Bikes: 89 Schwinn 754, 90 Trek 1100, 93 Trek 2300, 94 Trek 1400 (under construction), 94 Trek 930, 97 Trek 1400
Posts: 1,315
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
To see if you can upgrade to a 10 speed cassette in the rear, you need to check the rear dropout spacing first.

7-speeds were originally 126mm between the rear dropouts. Some manufacturers spaced the rear dropouts at 130mm (compatible with 8, 9, 10 speed cassettes), even on bikes that they supplied with 7-speed cassettes. My 97 Trek 1400 has a 7-speed cassette, and it has dropouts spaced at 130mm.

If you have a bike with a steel frame, although many do not recommend it, if your frame has 126mm rear dropout spacing, you could try having a shop reset the rear dropouts to 130mm, but there is some risk that the joints will pop, and the frame will be ruined (the shop will not be responsible if the frame is ruined). If you have an aluminum or carbon fiber bike, resetting the rear dropout spacing is not possible.

After determining if the rear droputs are wide enough, you need to check your rear wheel axle length to see if you can change the 7-speed freehub body to a 8,9, 10 freehub body and redish the rear wheel, or if the rear axle is 130, and has 8, 9, 10 freehub body and spacer for use with the 7-speed cassette.

I would think that if you need to buy a freehub body, and pay a shop to redish the rewheel, it may be less expensive to buy a replacement rear wheel.

If you have a newer rear wheel, and has a 10speed freehub, you're all set.

Remember that you will need to buy a new rear derailleur, new chain, and a new right side (rear) shifter (I don't know if your 7-speed front derailleur and left side shifter will work, or if they need to be replaced).

There are still plenty of 7-speed replacement and upgrade parts available. While your LBS may not actively be restocking 7-speed parts as they are sold, you may be able to swing a sweet deal with a bike shop that has the parts sitting in inventory gathering dust. You can also find 7-speed parts all day on eBay.

Last edited by RoadGuy; 07-26-14 at 03:52 PM.
RoadGuy is offline   Reply With Quote
Old 07-26-14, 03:51 PM   #9
hueyhoolihan
Senior Member
 
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
Posts: 6,401
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
lots to do. i'd just get some nice 7 speed stuff.
hueyhoolihan is offline   Reply With Quote
Old 07-26-14, 03:59 PM   #10
RoadGuy
Senior Member
 
Join Date: Jul 2014
Location: SoCal
Bikes: 89 Schwinn 754, 90 Trek 1100, 93 Trek 2300, 94 Trek 1400 (under construction), 94 Trek 930, 97 Trek 1400
Posts: 1,315
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Quote:
Originally Posted by hueyhoolihan View Post
lots to do. i'd just get some nice 7 speed stuff.

Out here in SoCal, you can find Major Brand Name 14, 16, 18, & 20 speed road bikes priced anywhere from $175-$400 on CraigsList. There's a Trek 2100 (16-speed STI) Composite Carbon Fiber bike selling for $180, with an extra set of wheels and tires. I think it would be less expensive to buy a newer bike for the parts, than try to buy all the parts separately. The bonus is that you could ride the newer bike and see how you like it, before you strip it. You might find that you actually like it better than the old bike you're planning on upgrading.

Do you actually have a use for the extra gears, or are you planning an ungrade for the"cool" factor? I hate to break it to you, but nobody is counting the cogs on your rear wheel.

Last edited by RoadGuy; 07-26-14 at 04:05 PM.
RoadGuy is offline   Reply With Quote
Old 07-26-14, 04:15 PM   #11
Darth Lefty 
Disco Infiltrator
 
Darth Lefty's Avatar
 
Join Date: May 2013
Location: Orangevale CA
Bikes: '76 Paramount, 02 Hardrock, '98 C'Dale XR800, '04 Burley Samba, '15 Priority Classic
Posts: 5,836
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 150 Post(s)
Quote:
Originally Posted by Kruzen View Post
Hey folks, I'm new to the forum. I hope I can get an answer to a question. I have a Diamondback response that is a project bike. It is a 7-speed. Can I install a 9 speed rear chain rings and change the shifter as well? It seems difficult to find up-grade parts for a 7 speed.

Thanks
I guess my question is, what is it you are trying to accomplish, what needs upgrading about it? Is something broken or does it not shift properly?
Darth Lefty is online now   Reply With Quote
Old 07-26-14, 04:24 PM   #12
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: My War
Posts: 26,860
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 304 Post(s)
The Response has 135 mm rear spacing. It's a mountainbike.
LesterOfPuppets is offline   Reply With Quote
Old 07-26-14, 04:28 PM   #13
SkyDog75
Senior Member
 
Join Date: May 2011
Location: Upstate NY
Bikes: Bianchi San Mateo and a few others
Posts: 2,247
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 80 Post(s)
Quote:
Originally Posted by Kruzen View Post
It seems difficult to find up-grade parts for a 7 speed.
Repair parts for 7-speed bikes are easy to find. Shifters, derailleurs, and freewheels are readily available and cheap from places like Niagara Cycle. You could probably get this thing riding like a new bike without spending a fortune. Upgrade parts, on the other hand... Well, what exactly are you trying to upgrade?
SkyDog75 is offline   Reply With Quote
Old 07-26-14, 08:22 PM   #14
RoadGuy
Senior Member
 
Join Date: Jul 2014
Location: SoCal
Bikes: 89 Schwinn 754, 90 Trek 1100, 93 Trek 2300, 94 Trek 1400 (under construction), 94 Trek 930, 97 Trek 1400
Posts: 1,315
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Kruzen,

I would have sent you a PM, except, I'm a new forum member, and can't PM until I get to 50 messages.

If you're interested in a whole set of parts from a highend aluminum mountain bike, I recently stripped down a Trek 8000 mountain bike for the parts after the SL (SuperLight) aluminum frame cracked up around the bottom bracket.


It has Alexrims DM18 Upgrade Wheels with a 9-speed cassette and good used tires, RockShok Judy front suspension fork, Bontrager seatpost, Deore LX 9-speed brake levers with integrated shifter, Deore Triple FD, Deore XT RD, KM 9-speed chain, Avid Series-3 V-brakes (needs new brake pads), Bontrager Comp triple crankset, and a sealed bottom bracket. The parts are dirty (have not been cleaned), but they are serviceable. The price would be $125, plus shipping for everything.

Would you be interested in buying the parts in a lot, or buying individual parts?
RoadGuy is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:44 PM.