
Bare cranks, 175mm, compact 110 BCD - 565 g:

Batteries - 21 g:

Rotor chainring bolts - 12 g:

11 mm spacer needed for BBright:

Praxis 52-36 compact rings - 157 g:

Full ensemble of cranks and rings - 761 g:

Same ensemble measured on Ultimate scales (5 g precision) - 760 g:

Is it good for Weight Weenie power measurement? Rotor claims that it is the "market’s lightest real power measurement product". However, Fairwheel measured the THM M3 SRM at 671 g with 53/39 Praxis rings, so neglecting the 11 mm spacer about 80 g lighter than my Rotor with 52-36 Praxis compact - http://fairwheelbikes.com/cycling-blog/?attachment_id=2906. Obviously the Rotor is substantially cheaper. (I suspect that the Cannondale SI Hollowgram SRM would be similarly light as the M3 SRM.)