Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
Wrong BB with new chainset?
#1
Hello,

I have a 2009 Trek 7.3fx. I recently bought a new BB, chainset and front mech for it. All of the parts (Shimano Alivio and UN-26 BB) are supposed to be compatible, but now that I have installed them all, the front mech doesn't work.

No matter how hard I pull it without the cable on, it only ever comes level with the biggest chain ring, and won't encompass it - so I can't change into top.

Is it possible that even though I got exactly the same size BB (68x122), that the new FM needs a shorter BB?

Many thanks!!
Reply
#2
Yes.

It may be the FD or the crankset. What does the chainline look like (alignment of the cogs at there rear versus the chain rings at the front)?
Nigel
Reply
#3
Have you adjusted the limit scews on the front mech?
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  1977 Raleigh 26tpi BB and Chainset Flying Scot 2 2,933 11-23-2013, 10:16 PM
Last Post: WinterRider
  Wrong size BB losemoneyg 13 10,488 08-10-2011, 06:28 AM
Last Post: losemoneyg

Forum Jump:



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

feed