HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Fri Apr 27, 2012 6:54 am 
Offline

Joined: Sun Sep 27, 2009 9:54 am
Posts: 359
Location: Australia
Hi all,

Sorry if this has come up before. I can't find it in the search.

I've crashed my Foil 20 so I'm buying a Scott Foil Premium and DA Di2 groupset to go with it.


The groupset i purchased comes with a standard external BB shell and i will need to purchase a BB86 BB that will work with the 7900 DA crankset (24mm O.D. spindle).

Shimano makes a BB86 adaptor for the DA7900 crankset but it looks like it's made out of plastic. It's called the BB91-B.
I've used a similar (plastic) BB86 adaptor for a Sram Red crank and it was crap.

My questions are,
1. Can anyone confirm that the BB91-B BB made from plastic?
2. Can anyone recommend a better BB that works on a BB86 BB shell and a DA7900 crankset?

thanks guys

_________________
2012 Scott Foil Premium


Top
 Profile  
 
Posted: Fri Apr 27, 2012 6:54 am 


Top
  
 
PostPosted: Fri Apr 27, 2012 8:35 am 
Offline
User avatar

Joined: Mon Jan 15, 2007 5:27 pm
Posts: 334
Location: Switzerland
1. Yes, it is made of plastic.

2. Better... Hard to tell, the Shimano is working flawlessly (but those BB86 BB may need loctite to prevent creaking). There are options from Enduro (XD-15), which is made of alu if I am correct. I think FSA is an option too.


Top
 Profile  
 
PostPosted: Fri Apr 27, 2012 11:31 am 
Offline
User avatar

Joined: Wed Feb 25, 2009 7:58 pm
Posts: 303
Location: Lancaster, UK
I've run the Shimano pressfit (plastic) and the Endura ceramic on my BB86. The Enduro is lovely and smooth, and well made, but actually creaks a tad more than the Shimano, as the internal surfaces are metal.


Top
 Profile  
 
PostPosted: Fri Apr 27, 2012 3:07 pm 
Offline

Joined: Sat Jun 06, 2009 7:28 am
Posts: 479
The shimano product works well. It is made of plastic, so is your frame.


Top
 Profile  
 
PostPosted: Fri Apr 27, 2012 5:21 pm 
Offline

Joined: Sun Aug 23, 2009 10:38 am
Posts: 413
The problem with these BB30 and other type of huge BB bearings that you press into the shell is that they are very prone to massive creaking noises when the bike flexes. The old steel skinny-tubed bikes of the past never had as many issues with BB creaking due to flex of the BB/downtube because the older cartridge bearings were housed in a singular unit with cups that were pressed into the frame. These newer huge BB30 and other bottom brackets press the bearings right into the frame. Big difference.


Top
 Profile  
 
PostPosted: Fri Apr 27, 2012 6:02 pm 
Offline

Joined: Sun Sep 27, 2009 9:54 am
Posts: 359
Location: Australia
Thanks for all the replies guys.

I've just realised that the TokenBB i have for my Sram Reds will work with the DA 7900 crank.
Sram cranksets has a tapered axle which go from 24mm on the drive side to 22mm on the non-drive side. The Token BB uses an alloy shim to make that reduction. If i don't use the alloy shim the BB will be 24mm on both side, which is what i need.

The biggest problem that i had when i used a plastic type BB on the Reds was serviceability. I found it really hard to remove without damaging it in one way or another.

If i had to buy one i would probably just go with the BB91-B just because it's cheap and may help with unwanted creaking.

Thanks to the weight of Di2 i've given up on being a true WW so no ceramic bearings for me.

_________________
2012 Scott Foil Premium


Top
 Profile  
 
PostPosted: Wed May 02, 2012 4:48 pm 
Offline

Joined: Sun Aug 23, 2009 10:38 am
Posts: 413
Can you adjust the chainline with BB86 the same way you could with the older English-threaded BBs?


Top
 Profile  
 
PostPosted: Wed May 02, 2012 5:34 pm 
Offline

Joined: Thu Feb 10, 2011 8:58 pm
Posts: 155
bones wrote:
Can you adjust the chainline with BB86 the same way you could with the older English-threaded BBs?


I'm not sure you can adjust them. Mine sits flush against the frame. You might be able to use spacers out side the BB too move the crank left or right but I would think you'd want the crank against the bearing.


Top
 Profile  
 
PostPosted: Wed May 02, 2012 5:41 pm 
Offline

Joined: Sun Aug 23, 2009 10:38 am
Posts: 413
civdic wrote:
bones wrote:
Can you adjust the chainline with BB86 the same way you could with the older English-threaded BBs?


I'm not sure you can adjust them. Mine sits flush against the frame. You might be able to use spacers out side the BB too move the crank left or right but I would think you'd want the crank against the bearing.



not if you are running a singlespeed or fixed gear bike. You want the chainring to match up with the rear cog.


Top
 Profile  
 
Posted: Wed May 02, 2012 5:41 pm 


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 


Who is online

Users browsing this forum: Bing [Bot], jby, Jdrsvin, mcy, sluggo, Yahoo [Bot] and 55 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. BB86 tools

in Road

SDP

2

598

Sun Aug 25, 2013 4:21 pm

SDP View the latest post

There are no new unread posts for this topic. BB help bb30 quarq into bb86

in Road

carbon337

5

221

Wed Jun 25, 2014 12:33 pm

grover View the latest post

There are no new unread posts for this topic. Can Hollowgram SISL2 crankset be used with a BB86 or 386EVO?

in Road

mambo

3

566

Tue Nov 05, 2013 12:44 am

deltree View the latest post

There are no new unread posts for this topic. Press fit venge headset bearings?

in Road

USPS

2

471

Mon Aug 19, 2013 2:07 pm

wingguy View the latest post

There are no new unread posts for this topic. Homemade bottom bracket cup press

in Road

robhall2003

5

906

Wed May 07, 2014 10:18 pm

audiphile View the latest post


It is currently Thu Jul 31, 2014 9:37 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB