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  [ 4 posts ] 
Author Message
PostPosted: Tue Mar 04, 2014 2:20 pm 
Offline

Joined: Sat Jan 23, 2010 1:24 am
Posts: 98
Location: Evansville, IN, USA
I'm building up an Madone 7 for a friend and installing an FC-9000 (Dura-Ace) crank in the BB90 bottom bracket. With the bearings fully seated, it appears that the leftside arm does not slide onto the crank axle quite as far as I have experienced on other bikes I have built in the past.

Researching BB standards, the BB90 appears to be the widest at 90.5mm for road.

Thus on a related note, Shimano also sells two (2) different crank fixing bolts. (Version 1 and Version 2). The difference is thread length. Version 1 thread length is approx 8.5mm and version 2 is approx 16mm. I am assuming the version 2 is for these situations where the slightly wider bottom bracket causes the crank arm to engage on the splines slightly less.

Waiting on the crank fixing bolt to arrive (ver 2), but asking for input to see if I'm interpreting this correctly. Engagement of the arm on the splines seems to be about half, although that appears to be per design?

_________________
2013 BMC TMR01 custom build
2013 Cannondale F-Series 29'er, Carbon 3
2012 Cannondale CAAD10-1 custom build, 14.06 lbs
2011 Specialized Crux, Alloy
2009 Specialized Roubaix Pro SL SRAM Red
1980 Palo Alto custom build


Top
 Profile  
 
Posted: Tue Mar 04, 2014 2:20 pm 


Top
  
 
PostPosted: Tue Mar 04, 2014 6:34 pm 
Offline

Joined: Tue Oct 25, 2011 4:50 am
Posts: 63
Strange.

Give the DS crankarm a light tap with a rubber mallet--make sure it's all the way in there.


Top
 Profile  
 
PostPosted: Tue Mar 04, 2014 8:12 pm 
Offline

Joined: Wed Jan 30, 2013 6:10 pm
Posts: 6
The crank fixing bolt is not designed to lock the crank arm in place. It's only used to apply the right amount of 'pre-load' on the bearings. The two smaller bolts in the crank arm fixate the crank arm on the axle.

So, basically, if the thread on your version 1 bolt engages, you should be fine. Just give the crank a tap like crimsonbadger says.


Top
 Profile  
 
PostPosted: Tue Mar 04, 2014 9:04 pm 
Offline

Joined: Tue Sep 11, 2012 6:07 pm
Posts: 653
Location: The Taint of the USA!
I recently did this on my 2013 Madone 5 (same BB dimensions). Give the crank a tap with a rubber mallet, and once through, secure the crank (as mentioned above).

_________________
2013 Madone 5, Superfly
2012 SpeedConcept 7, Cobia


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 


Who is online

Users browsing this forum: Baidu [Spider], Bing [Bot], Google [Bot], Majestic-12 [Bot], Timmy269 and 29 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. Campagnolo Ultratorque and Trek BB90

in Road

Calnago

1

198

Mon Oct 20, 2014 6:40 am

ehudk View the latest post

There are no new unread posts for this topic. Which PF 30 bottom bracket

[ Go to page: 1, 2 ]

in Road

mattlawro

21

2053

Wed Jun 25, 2014 2:28 pm

topflightpro View the latest post

There are no new unread posts for this topic. Colnago Bottom Bracket

in Road

ironman1

9

966

Sat Nov 22, 2014 6:03 pm

kmenon610 View the latest post

There are no new unread posts for this topic. Truvativ FP-30 Bottom Bracket

in Road

Krull

6

220

Wed Oct 22, 2014 3:37 pm

goodboyr View the latest post

There are no new unread posts for this topic. Shimano 6870 or Shimano 9000?

[ Go to page: 1, 2, 3 ]

in Road

Ahillock

33

4261

Sat Aug 23, 2014 1:48 pm

Stats View the latest post


It is currently Fri Nov 28, 2014 12:17 pm

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