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Looking at how well mounted the tyres were on the test rig, I think the error bars on their results should maybe be slightly larger.
It looks like they've basically chopped down existing tyres and wrapped it around a 16" diameter wooden disc.
(BTW, I'm not disputing the overall conclusion. It would just be nice if the test could be done rigorously to get data that is definitely representative of real world conditions)
Are 7710 the 9-speed dura ace that take an octalink BB? I might have a set of these cranks, but they're not NJS stamped.