Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take Part in the February Giveaway for a Chance to Win 2x METRO Hybrid Bikes


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...

Forum Jump:

[-]
10 Latest Posts
How to keep your bicycle safe?
Today 10:40 AM
Please help! Identifying this ol' gal.
Today 12:53 AM
New Wheel Question
Yesterday 10:21 PM
1990 Specialized Rockhopper How to Fluff...
02-26-2024 10:07 PM
Flat Repair Tools
02-26-2024 03:49 PM
Top 3 Bibshorts in terms of value
02-26-2024 03:07 AM
Why do spokes break?
02-25-2024 10:35 PM
New Wheel Question
02-25-2024 10:32 PM
Hello to all. I a just introducing mysel...
02-25-2024 10:29 PM
Chain sits on top of chainring when shif...
02-25-2024 10:16 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. GirishH
25 posts
no avatar 2. enkei
23 posts
no avatar 3. ReapThaWhirlwind
15 posts
no avatar 4. Jesper
14 posts
no avatar 5. meamoantonio
14 posts