Need info on Bottom Bracket for Biopace Triple

[Mike K.]

Hey all,

I'm trying to find the appropriate bottom bracket for a Biopace triple, model number FCR-124 or FC-R124, depending on who you ask.

Anyone familiar with it and what length spindle to use?

- Mike

[Garth]

When in wonder google just may help !  A quick search of this model number revealed this link :
http://www.velobase.com/ViewComponent.aspx?ID=799B9408-3493-4BC2-BAAD-CE435E385B78&Enum=115&AbsPos=0

For use with a D3-SS 121.5 mm bottom bracket with 5 mm drive side offset axle, or the more readily available symmetrical UN54 127.5 mm cartridge bottom bracket

 So a current UN55 127.5 would work just fine, or Tange and other brand equivalent.  Most disposable cartridges follow the Shimano offsets per given axle length.

cheers !

[Michael Kaiser]

Beautiful! I actually found that page but didn't read the comments closely.

Thank you!

[Ginz]

I am using a 119 or 121mm (can't remember which) asym Phil Wood on an XT triple that came with biopace.   Chainline is perfect. 

[Michael Kaiser]

Sounds dreamy. My crankset isn't XT, though, unfortunately. Might just ditch this crankset and pick up a new one. We'll see. I'd like to make the set work if I can determine appropriate bb length and potentially swap out the biopace. I've heard such disparaging information about them, but no one seems torn about round rings, and I'm not the type to run with the different set to test out how they effect my knees. I'd rather go with round, which I know are fine, and save the knees.