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

Thread Tools Search this Thread
Old 07-21-08, 05:50 PM   #1
Junior Member
Thread Starter
Join Date: May 2005
Location: Bellevue, WA
Bikes: Trek 7200FX
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Upshifting issues (in the front)

I've put together a bike on Nashbar Touring frame and I have an issue with from derailleur.

The derailleur is Tiagra, and the crank is Nashbar Trekking crank (48/38/28)
Everything works ok, except:

When upshifting from middle to large, chain "binds" between derailleur inner plate and large chainring - so there is high resistance for rotation of cranks - and when I "force" it through, chain is picked up by large ring and everything is normal from that point on.
The derailleur is adjusted by Shimano instructions... I can't figure out what's wrong. The only thing that I suspect is that it's too low on a chainring.. but it doesn't appear so. Could that cause this kind of behavior ?

I'd really appreciate some advice on this

Maestro is offline   Reply With Quote
Old 07-21-08, 07:46 PM   #2
Senior Member
joejack951's Avatar
Join Date: May 2004
Location: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
Posts: 11,502
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 896 Post(s)
Are you finding this binding while working on the bike on a repair stand? The first time this happened to me I thought something must be wrong and fiddled and fiddled and got nowhere. Finally, I tried shifting out on the road and it was fine. I've since learned not to care too much about how a bike shifts on a repair stand and always make my final adjustments out on the road.
joejack951 is offline   Reply With Quote
Old 07-21-08, 10:38 PM   #3
t0t4l n00b
theShiba's Avatar
Join Date: May 2007
Location: Washington Heights, NYC
Bikes: Cannondale CAAD3 R800... Old Nishki MTB that I might try to turn into a fixie...
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Too little clearance could cause this problem, as you rightly suspect. See if moving things up a couple of mm fixes things...
theShiba is offline   Reply With Quote
Old 07-22-08, 11:15 AM   #4
Senior Member
Join Date: Sep 2007
Posts: 1,152
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is the big chainring facing the right way, with the chain-peg facing out?

This can also happen when u shift while pedaling too slowly as mentioned.
jsmithepa is offline   Reply With Quote
Old 07-22-08, 11:59 AM   #5
Senior Member
DannoXYZ's Avatar
Join Date: Jul 2005
Location: Saratoga, CA
Posts: 11,633
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
Make sure your FD is aligned correctly. That is, the outer-cage is just 2-3mm above the large chainring (I prefer 1-2mm). If your outer-cage is rotated correctly to be parallel to the chain in the highest gear (big-chainring/smallest-cog), it helps shifting up to bend the tip of the inner-cage outwards slightly. This helps shove the chain upwards and outwards.

Also use lower gears and spin faster. The higher speed and lower chain-tension will help it shift much better. Experienced riders learn to lighten up on the pedals slightly when shifting the front.
DannoXYZ is offline   Reply With Quote

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 04:51 PM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.