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

This has stymied a few mechanics

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.

This has stymied a few mechanics

Old 01-03-19, 05:55 PM
  #51  
2manybikes
Dog is my co-pilot
 
2manybikes's Avatar
 
Join Date: Jun 2003
Posts: 17,561

Bikes: 2 many

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 999 Post(s)
Liked 15 Times in 12 Posts
Originally Posted by Shimagnolo View Post

I thought I was the only one who ever had that happen.
I couldn't believe it when I finally figured out what happened.
(It was a homemade maltodextrin/fructose mix).
Me too. Fruit Punch.
2manybikes is offline  
Old 01-03-19, 07:17 PM
  #52  
nymtber
Senior Member
 
Join Date: Mar 2005
Location: NY state
Posts: 1,311

Bikes: See Signature...

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I don't see mention that you've looked at the shifter or cable guide (if your bike has one), why not? Seems those two points are the only remaining things to check. Or too short of housing somewhere or too long, causing extreme cable bending/binding.
nymtber is offline  
Old 01-03-19, 09:13 PM
  #53  
elmore leonard
Senior Member
 
Join Date: Mar 2015
Posts: 493
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Does this happen on all the chain rings? I read your post and was not clear on that. I was wondering if you are cross chaining when this happens? Or? If you have a light rear derailleur hangar it may be bending.

Last edited by elmore leonard; 01-03-19 at 09:33 PM.
elmore leonard is offline  
Old 01-05-19, 03:54 PM
  #54  
BrocLuno
Senior Member
 
BrocLuno's Avatar
 
Join Date: Nov 2018
Location: Kalifornia Kollective
Posts: 353

Bikes: K2 (Marzocchi/Fox), Trek 6000 (red) MARS Elite up front, Specialized Hardrock Sport -> eBike (R7 Elite up front), lastly TREK 820 loaner. Recently sold Peugeot du Monde Record and 1956 Schwinn (owned since new).

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 75 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm think weak spring ...
BrocLuno is offline  
Old 01-20-19, 02:15 PM
  #55  
Koyote
Senior Member
Thread Starter
 
Join Date: Sep 2017
Posts: 727
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 401 Post(s)
Liked 114 Times in 63 Posts
Here's where we're at:

Shift cables and housing replaced.
Shifter flushed with WD-40, also with degreaser, and then lubed.
Derailleur hanger alignment checked yet again.
New chain yet again.
Derailleur adjusted (H and L limits, B screw) yet again.
And recall that the RD and Cassette have both been replaced for other reasons since the shifting went wonky.

I'm gonna bite the bullet and buy new shifters - they're only available as a pair. At least I can get them from a retailer that will allow me to return them if it turns out to not be the issue...So I will carefully install the right (rear) shifter, try it out, and see if it works. Will post here after I have tried it.
Koyote is offline  
Old 01-20-19, 03:19 PM
  #56  
masi61
Senior Member
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 2,054

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 388 Post(s)
Likes: 0
Liked 9 Times in 9 Posts
Originally Posted by Koyote View Post
I've had this problem with a road bike for a few years, and have asked a couple mechanics to look into - usually when the bike is in a shop for other work. So far, no one has solved it.

Ten-year old Shimano 10-speed groupset with compact crankset. Bike shifts fine on the top 6-7 cogs (biggest cogs/lowest gears). When I try to shift down the cassette past the sixth or seventh cog (so, trying to shift to higher gears), chain won't drop down to next cog immediately, if at all -- usually I have to click the shifter again, and then the chain will drop two cogs. Shifting up the cassette (to smaller gears) works fine.

Following has been tried:
-Derailleur hanger alignment checked (3-4 times).
-New cable.
-New chain (replaced regularly anyway).
-New cassette (normal replacement)
-New RD.

I've even tried a different wheelset. Nothing works.

Ideas from the BF brain trust?

Thanks in advance!
Which specific 10 year old group set components are you using? Just curious - does the rear derailleur housing run out the side of the lever or under the bars?

Also, I can’t recall if you said whether you replaced the bottom bracket cable guide or not - if you haven’t you should do that.

And can you tell us the brand of cable and housing you are using? My LBS mechanics that I have talked to all say the same thing about the current crop of polymer coated “slick” cables - they suck royally. The plastic coating starts degrading right away and they have been known to fail in as little as 500 to 1000 miles. Also did you replace the housing yourself or did the bike shop do it? Could you post a picture of the rear housing loop? And are you certain that the ferrules were installed correctly (housing ends cut square, any burrs filed smooth, proper compressionless housing used and ferrule seated fully on ends of housing?

i had crap shifting with my Dura Ace 7700/7703 9 speed set-up with symptoms very similar to yours. Jagwire LE-X housing, Jagwire stainless “polished” (not coated in any way) inner wire and a new bottom bracket guide restored perfect operation. The guide might look OK and appear to slide OK but lubing it with oil or grease will not cure it. Remove it and look at it - mine had grooves eroded in it from cable inner wire strands that acted on the inner wire in a bad way. Once this little $3 part was replaced things got noticeably better immediately.

Last edited by masi61; 01-20-19 at 03:26 PM.
masi61 is offline  
Old 01-28-19, 09:46 AM
  #57  
Koyote
Senior Member
Thread Starter
 
Join Date: Sep 2017
Posts: 727
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 401 Post(s)
Liked 114 Times in 63 Posts
Originally Posted by masi61 View Post


Which specific 10 year old group set components are you using? Just curious - does the rear derailleur housing run out the side of the lever or under the bars?

Also, I can’t recall if you said whether you replaced the bottom bracket cable guide or not - if you haven’t you should do that.

And can you tell us the brand of cable and housing you are using? My LBS mechanics that I have talked to all say the same thing about the current crop of polymer coated “slick” cables - they suck royally. The plastic coating starts degrading right away and they have been known to fail in as little as 500 to 1000 miles. Also did you replace the housing yourself or did the bike shop do it? Could you post a picture of the rear housing loop? And are you certain that the ferrules were installed correctly (housing ends cut square, any burrs filed smooth, proper compressionless housing used and ferrule seated fully on ends of housing?

i had crap shifting with my Dura Ace 7700/7703 9 speed set-up with symptoms very similar to yours. Jagwire LE-X housing, Jagwire stainless “polished” (not coated in any way) inner wire and a new bottom bracket guide restored perfect operation. The guide might look OK and appear to slide OK but lubing it with oil or grease will not cure it. Remove it and look at it - mine had grooves eroded in it from cable inner wire strands that acted on the inner wire in a bad way. Once this little $3 part was replaced things got noticeably better immediately.
I've now even tried another 10-speed brifter (one which is known to function properly) and the problem remains...so that little BB cable guide is the last item. I'll try it. And if that doesn't fix the problem, I'm gonna just ride the bike as-is, since I have a couple other bikes. It'll become my "foul weather, beat-the-s**t outta it" bike.
Koyote is offline  
Old 01-28-19, 12:17 PM
  #58  
masi61
Senior Member
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 2,054

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 388 Post(s)
Likes: 0
Liked 9 Times in 9 Posts
Originally Posted by Koyote View Post
I've now even tried another 10-speed brifter (one which is known to function properly) and the problem remains...so that little BB cable guide is the last item. I'll try it. And if that doesn't fix the problem, I'm gonna just ride the bike as-is, since I have a couple other bikes. It'll become my "foul weather, beat-the-s**t outta it" bike.
Good luck! That would be great if changing the bb cable guide would restore smooth shifting. Let us know the outcome.
masi61 is offline  
Old 01-28-19, 01:08 PM
  #59  
wphamilton
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 14,550

Bikes: Nashbar Road

Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 2505 Post(s)
Liked 55 Times in 33 Posts
Maybe fudge it: alternate cable routing to the DR clamp to increase travel.
wphamilton is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
CliffordK
Pacific Northwest
0
05-09-18 03:02 PM
Kovalski
Introductions
4
01-30-12 05:51 AM
Jersh
Clydesdales/Athenas (200+ lb / 91+ kg)
13
08-29-09 11:54 AM

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


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.