1992 Marin Bear Valley BB

Dickie66

Dirt Disciple
I've been give a 92 bear valley that must have been used little & then stored a long time? after a full strip it seems that the bottom bracket is needing replacement, no play, but feels rough. It's a shimano BB-CS20 BC1.37x24 about 124mm in length and screws in from the left with the plastic support from the right. what modern replacement do i need?

thanks
 
Re:

I would say probably 122.5 in length and a 68mm shell width. Bikes either came with a 68 or 73 shell width, 68 being more common. Double check by simply measuring the width of the shell. A Shimano UN55 is lx quality and readily available off ebay. :D
 

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