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@branwen
I think they might be just that custom-milled crank arm from the study? I know we have 150 mm ones on the Rollapaluza kids bikes, and I think GB track team have a couple of them at least to practice high cadence stuff.
I'm sorely tempted to try the shorter cranks for my road bike, I'm guessing I could just put a 3/32" chaining on my On-One track cranks?