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@gbj_tester
M5 have been promising these for years, but they never seem to arrive.
@Autti: It's true that DuraAce cranks consistently test as the stiffest road racing cranks, but do we need such stiff cranks? OK, also, do we need <600g chainsets, but it's good to have these choices; not everybody is a 90kg sprinter.
Incidentally, my 1993 CQP cranks are as stiff as any alloy square taper cranks I've ridden, and come in at 620g complete with 50t single ring and BB, could easily be <600g for a 50/36 compact double with some tuning of the heavy duty spider and lighter rings.