Old 12-30-09, 09:18 PM
  #4  
bigvegan
Senior Member
 
bigvegan's Avatar
 
Join Date: Feb 2009
Posts: 658
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Silkworm View Post
Are these parts compatible? I've heard in some cases that ISO cranks and JIS bb's and vice-versa are compatible. Any know if these two are?
I CANNOT believe this, but they may be.

http://www.sheldonbrown.com/bbtaper.html - " if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length."

Since your Messenger crank needs a 103mm JIS BB, and your Sugino BB is a 109mm ISO BB, the extra length and the narrower taper may cancel each other out and leave you with a chainline that's within 1-2mm of perfectly straight.

Unbelievable.

I'd still buy a new 103mm JIS bottom bracket for $25, but you just may be in luck.
bigvegan is offline