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You mean crank arm?
If that hits first, you can mill bits off it. Eventually you get to the point where your pedal axle is poking out of the back of the crank. I'd like to do shorter threads, I think large diameter (like FC-7300/PD-7300 but without the bearing-in-crank thing) would keep the stress within reasonable bounds with a 10mm thread engagement, which is about 4mm less than we use with 9/16×20, so 125mm Q looks feasible. Custom pedal axles and custom cranks - only rich people need apply :-)
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gbj_tester
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like FC-7300/PD-7300
How would you wrangle modern pedals in there? Machine an adaptor?
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Is that a real project? It still surprises me that in the years since the zipp vumachrono we haven't had anything much happening in the aero crankset world. I think there is a gap in the market for some very thin metal cranks to fit in a powermeter spider.
Scilly.Suffolk
specialist
You mean crank arm? Incidentally I measured Sugino DD75s to be 132mm q factor