Should Bottom Bracket sit flush with the frame?

Undulations
Posts: 5
Joined: Sun Oct 30, 2011 9:12 am

Should Bottom Bracket sit flush with the frame?

Postby Undulations » Sun Sep 09, 2012 9:01 pm

Hi there,

I'm pretty ordinary when it comes to most bike tech so I was just wondering if a press fit BB should sit flush with the frame?
The cranks feel pretty stiff to turn (should be past the initial stiffness of the break in period) and I was wondering if it could be in need of a service.

I've posted a pic below, not sure if the gap is supposed to be there :?
Image

User avatar
Mulger bill
Super Mod
Super Mod
Posts: 28359
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Re: Should Bottom Bracket sit flush with the frame?

Postby Mulger bill » Mon Sep 10, 2012 1:24 pm

The cups have small lips that should sit flush with the edge of the BB shell.
If you're getting some binding then it's possible that the shell has not been properly faced.
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011

Undulations
Posts: 5
Joined: Sun Oct 30, 2011 9:12 am

Re: Should Bottom Bracket sit flush with the frame?

Postby Undulations » Mon Sep 10, 2012 5:34 pm

Took it down to the LBS and all is now well! Had to be pressed in a little bit further to the lip of the BB, should save me a few watts in resistance :)
Thanks for the advice!

Who is online

Users browsing this forum: human909