• Is there any way of finding out before hand what spacers I'll need to run the Si Cranks in with a RF 73mm spindle in a BSA BB?

    Also we know if the RF drive side self extracting bolt will work with Hollowgrams?

    Would be amazing if it does because you will no long need the cannondale tool to pull them!

  • Is there any way of finding out before hand what spacers I'll need to run the Si Cranks in with a RF 73mm spindle in a BSA BB?

    Maths!

    Cannondale publish PDFs listing the spacers required for various applications.

    Scalpel PF30x73mm:
    137mm spindle
    DS: bearing shield (2mm?), 14mm spacer
    NDS: bearing shield (2mm?), wave washer, 1-3 shims (0.5mm), 19mm spacer

    So for BSA30x73mm, lose the bearing shields, make space for 10.5mm external cups:
    134.5mm RF spindle (call it 134mm for calculations)
    DS: 4mm spacer
    NDS: wave, shims, 9mm spacer.

    Your chainline will be ~1.5mm narrower than the same spider/ring on a Scalpel.

  • Great work thanks very much, now to find some where to get the spacers from...

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