's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )


Apr 30, 2003 3:21 PM
I just bought a dura-ace DOUBLE crank set and front derielleur. I removed a TRIPLE CRANK SET from my machine to put this DOUBLE on. The bottom bracket I have is a SHIM. 105. When I put the front dereielleur on it doesn't appear that the the outer edge of the chain guard aligns with the largest chainring. According to what I have read, this should be the case. My quesion is this, do I have to get another bottom bracket because I went from TRIPLE to DOUBLE? OOOORRR, am I just not understanding something about putting the front der. on? If i continue to install the der. in this fashion, i don't see out in the world the chain guard of the der. would ever go over the largest chainring. It looks like it will never get past the first chainring. PLEASE HELP ... I CAN'T RIDE UNTIL this is fixed!

Also, If i have to get a new bottom bracket can I get one other than the shimano? I heard the Dura-ace bb is a pain to adjust and setup.
Get double bbNessism
Apr 30, 2003 3:40 PM
You need to get a double bb to work with a double crank. Go for a Ultegra bb if you don't want to hassle with DA. Quite a few people are using this setup with good results. As far as I know, there are no aftermarket bb's for Shimano Octalink cranks.

Get double bbgrettm
Apr 30, 2003 4:49 PM
Thanks man. Big saver there. I will check with performance...
You need a double and you need a Shimano.russw19
May 1, 2003 1:02 AM
Specifically you need a Shimano BB with a 109.5 spindle. The triple uses a 118mm spindle. It's too long for the double crank.

Also you have to use a Shimano BB. NOBODY elso makes an Octalink compatible BB. ISIS is not the same pattern. ISIS uses a 10 spline pattern, Octalink, as the name implies, is an 8 spline pattern.

The Dura-Ace BB is not hard to set up... it's just like any other adjustable BB. The one thing that has to be right (and should be anyways...) is that you have to make sure your Bottom Bracket shell is faced. If it wasn't done when the bike was new, you may not have the needle bearings line up correctly which would cause them to wear out faster than normal.

If you have no idea what I just said, get yourself the Ultegra sealed unit. Just get the 109.5 spindle and make sure the shell width matches your old BB.

Have fun,