Bottom bracket size

[dallas95]

I am rebuilding a 1991 alpinestars cro-mega dx and wondered if someone could tell me the bottom bracket axle length I need. Square taper shimano triple chainset to be fitted.

Build thread started: http://www.retrobike.co.uk/forum/viewtopic.php?t=181446

 

[drystonepaul]

The BB spindle will depend on what cranks you are using.

If you're going for the same cranks in the above picture from your build thread, then you'll need a 122.5mm BB spindle. I think that 91 Al-Megas have a 68mm BB shell width too.

 

[We_are_Stevo]

68mm BB width, spindle length will depend on the crankset you intend to use; the info for which you will find here...

http://sheldonbrown.com/bbsize.html

 

[dallas95]

Cheers Drystonepaul & Stevo thanks for the link.