BB91

Ask for advice or share your fettling tips
lef
Posts: 672
Joined: Sun Jun 20, 2010 12:31 pm

BB91

Postby lef » Sun Jan 20, 2013 13:52 pm

Anyone familiar with BB91? I'm thinking of getting a new frame with this type of BB. I take it all cranksets that fit bb86 fit BB91? I have a rotor 3d quarq so want to be sure its going to fit. Also are there any reports of creaking?

Did some searching but couldn't really find that much info.

User avatar
Monty Dog
Posts: 20389
Joined: Thu Dec 14, 2006 14:31 pm

Re: BB91

Postby Monty Dog » Sun Jan 20, 2013 21:35 pm

BB91 is Specialized proprietary version of BB86 and is for a regular 24mm dia spindle eg Hollowtech 2.
Make mine an Italian, with Campagnolo on the side..

lef
Posts: 672
Joined: Sun Jun 20, 2010 12:31 pm

Re: BB91

Postby lef » Tue Jan 22, 2013 23:49 pm

How does it compare to other BB types? Is it any good, and bad reports? Cannot find much to suggest there are common problems.

User avatar
Vinnyc19
Posts: 197
Joined: Sun May 16, 2010 17:59 pm

Re: BB91

Postby Vinnyc19 » Wed Jan 23, 2013 01:30 am

Its ok, they don't last that long and are a pain to change if you don't have the right tools

TheRealGuybrush
Posts: 123
Joined: Wed Aug 29, 2012 20:40 pm

Re: BB91

Postby TheRealGuybrush » Sat Jan 26, 2013 00:41 am

The BB91 is identical to other Press-Fit BB's however the bearing cups are (as Monty Dog said) a proprietary design with a slightly different ID. They are made for Specialized by Shimano so getting replacements are slightly harder as you'll have to get them from a Specialized dealer.

You will need the right tools to fit them and you can't take them out and put them back in as the cups are only plastic and are damaged (even with the correct tools) when you remove them from the frame. However this isn't just the BB91, this applies to all Press-Fit sizes. The correct tools are a little expensive but a good LBS can do this fairly cheaply.

ricky1980
Posts: 840
Joined: Wed Aug 15, 2012 18:37 pm

Re: BB91

Postby ricky1980 » Sat Jan 26, 2013 11:38 am

bloody cons i say! all these pressfit BBs are made out of cheap plastic. if they use alloy or steel they will last a long time guess then they won't make any money on them.

threaded BBs for me...thank your very much
Road - Cannondale CAAD 8 - 7.8kg
Road - Chinese Carbon Diablo - 6.4kg


Return to “Workshop”

Who is online

Users browsing this forum: No registered users and 6 guests