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

Reply
 
Thread Tools Search this Thread
Old 09-05-11, 09:39 AM   #1
diver88
Newbie
Thread Starter
 
Join Date: Sep 2011
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bottom bracket tight and not smooth turning

2.3 Trek roadbike all 105 with 300 miles and external bearing bottom bracket. take the chain off and turn by hand and it feels like there's some resistance and you can feel the bearings a little, the bike shop where I bought it says it's better components and they are tighter, nothing to worry about.. spin it by hand, let go and it stops instantly...

is this just characteristic of an external bearing bottom bracket?

thanks in advance.
diver88 is offline   Reply With Quote
Old 09-05-11, 09:59 AM   #2
reptilezs
Senior Member
 
Join Date: Sep 2004
Location: boston, ma
Bikes:
Posts: 2,852
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the least they could have done was adjust the preload. takes all of 5-10 mins for some piece of mind. seal drag shouldn't be that tight but depends on many factors. other things to look for, bb chase and face, bb properly tightened
reptilezs is offline   Reply With Quote
Old 09-05-11, 01:00 PM   #3
cyclist2000
Senior Member
 
cyclist2000's Avatar
 
Join Date: Sep 2009
Location: Up
Bikes: Masi (retired), Giant TCR, Eisentraut, Jamis Aurora Elite, Zullo (trainer bike), Cannondale, 84 Stumpjumper, Waterford(N+1), Tern D8 (N+1), looking for a Ti frame
Posts: 3,114
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
My FSA crank was tight and I removed it and reinstalled it to spec for the preload and it is fine now.
cyclist2000 is offline   Reply With Quote
Old 09-05-11, 01:21 PM   #4
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,017
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 393 Post(s)
There's a difference in the feel of seal drag and normal (correct) preload. It's possible you're feeling the effects of seal drag which goes away as the seals wear and some grease bleeds under them, or it could be excessive preload.

If I had it in my hands I'd venture an opinion, but without actually feeling the drag I can't. Either the shop is right, and it's fine, or the mechanic is too lazy to check/correct what he sees as a minor (not on his bike) problem. One thing you might do is ask him to let you feel another bike with the same or a similar BB, and compare them.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 09-06-11, 10:43 AM   #5
diver88
Newbie
Thread Starter
 
Join Date: Sep 2011
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks all, I need to go back to the shop anyway since the front deraileur still works only occasionally. you've given me a general idea of what to do next.
diver88 is offline   Reply With Quote
Reply


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 11:10 PM.