Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Front derailleur - how to increase travel?
#1
How do I increase the travel of the front derailleur?

I had to replace the bottom bracket. The new spindle is longer than the one I replaced. Now, I can't get sufficient travel to move the chain to the outside chainring (of a double).

I've backed the limit screw out as far as it will go. The arm of the derailleur hits the body of the derailleur itself. There is no more room to give.

Do I need to replace the derailleur? If so, what kind of information do I need to find a derailleur with sufficient travel.

Thanks,
Reply
#2
I suspect you'll probably have to find a shorter spindle. I assume some derailleurs have slightly more travel than others, but I don't know of any way to determine it other than trial and error.

If your BB is a three piece cup and spindle type, you might be able to just put it in the other way. A lot of spindles are longer on the drive side so reversing it would bring the crank closer to the frame. It would push your left leg out farther which isn't ideal, but not that big a deal.
Reply
#3
Dave has it covered.

You may be able to find a MTB front derailleur intended for a triple that will go far enough out, but most are limited to 48T is the biggest chain ring.

There is a reason that crank sets suggest a certain length of BB axle......

If you have a "sealed" bottom bracket, you'll need to get another one, the correct length.
http://www.amazon.com/Shimano-BB-UN54-Square-Bottom-Bracket/dp/B0014C4G58/

Here is an example of what Dave mentioned:
http://www.amazon.com/Pyramid-Bottom-Bracket-Axle-Type/dp/B000BMNQVW/
they are available in different lengths and offsets.
Nigel
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Front derailleur shifting problem dventura 1 6,388 02-28-2017, 06:07 PM
Last Post: nfmisso
  Front derailleur won't shift into third (largest) gear bruin1989 1 6,880 08-01-2016, 07:14 AM
Last Post: Joe_W
  Front derailleur can't shift from inner chainring to outer...sometimes Ptero 2 4,657 07-19-2016, 02:15 PM
Last Post: Joe_W
  Front derailleur drags on middle chainring? fionn88 1 4,699 06-09-2016, 08:56 PM
Last Post: DaveM
  Remove chain from front derailleur rider2 1 3,979 05-13-2016, 04:16 PM
Last Post: DaveM
  Chain Coming off Randomly / Front Derailleur Jlpicard440 12 6,691 09-07-2015, 06:29 PM
Last Post: painkiller
  Blocked front derailleur? dude 2 3,451 08-27-2015, 06:38 AM
Last Post: dude
  A Front Derailleur mounting and matching problem. qipow 0 3,594 08-08-2015, 11:53 AM
Last Post: qipow
  Front derailleur adjustment dude 3 5,984 07-26-2015, 04:38 PM
Last Post: painkiller
  Removed front derailleur. elmore leonard 22 13,422 04-26-2015, 04:13 PM
Last Post: elmore leonard

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed