I think 113mm, however it depend on the chainstay clearance.
Do you have any bottom bracket lying around? (any Shimano UN55 will work perfectly).
I have never really 'done' square taper .. nope :(
it easy, just don't fuck it up.
Best to hand it to a LBS and they'll easily figure out what bb length you need, quite likely to be 118-122.5mm due to the chainstay clearance (which admittedly look fine).
@amey started
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I think 113mm, however it depend on the chainstay clearance.
Do you have any bottom bracket lying around? (any Shimano UN55 will work perfectly).