• are you sure the BCD is 118? I have some SR cranks on my 80s record sprint with a 110BCD, same as a BMX

    yes, the holes are just under 70mm apart.

    According to Sheldon 69.4mm is 118BCD and apply to Ofmega and SR cranks
    http://www.sheldonbrown.com/gloss_bo-z.html

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