Convert Octalink V1 to Hollowtech II for a Dura-Ace 7900 crank
11-16-10, 07:20 AM
#1
Senior Member
Thread Starter
Join Date: Sep 2009
Location: Evansville, IN
Posts: 161
Bikes: CAAD10 and TMR01 daily riders
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Convert Octalink V1 to Hollowtech II for a Dura-Ace 7900 crank
Another question on a bike I am helping to upgrade:
It is a 2004 Trek 5200 with a Octalink V1 bottom bracket, Ultegra double crank, 53/39.
https://www.trekbikes.com/us/en/bikes/2004/archive/5200#
We are wanting to put a Dura-Ace FC-7900 crank on it so obviously the BB won't work as is.
Can a Dura-Ace 7900 Hollowtech II bottom bracket (SM-BB7900B) a direct screw in replacement into this frame? (If not that exact one, is there a BB that I can put in this frame to accept the FC-7900 crank?)
Any other gotcha's I need to be aware of?
Thanks!
It is a 2004 Trek 5200 with a Octalink V1 bottom bracket, Ultegra double crank, 53/39.
https://www.trekbikes.com/us/en/bikes/2004/archive/5200#
We are wanting to put a Dura-Ace FC-7900 crank on it so obviously the BB won't work as is.
Can a Dura-Ace 7900 Hollowtech II bottom bracket (SM-BB7900B) a direct screw in replacement into this frame? (If not that exact one, is there a BB that I can put in this frame to accept the FC-7900 crank?)
Any other gotcha's I need to be aware of?
Thanks!
11-16-10, 07:37 AM
#2
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2025 Post(s)
Likes: 0
Liked 1,089 Times
in
736 Posts
Your Trek has standard English bottom bracket threading so all you have to do is remove the Octalink bb completely and thread in the DA (or Ultegra or 105) external bearing cups and install the crank.
The only "gotcha" may be if the bottom bracket shell isn't faced accurately and the crank spindle doesn't align easily when you install it. In that case any decent LBS will be able to face the shell to correct it.
The only "gotcha" may be if the bottom bracket shell isn't faced accurately and the crank spindle doesn't align easily when you install it. In that case any decent LBS will be able to face the shell to correct it.
Thread
Thread Starter
Forum
Replies
Last Post
NachosGrande
Road Cycling
2
09-27-15 02:06 PM
