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.)
redhed18 wrote:Please post a picture of the crank when you have the chainrings fitted?
I'm dying to see what the MAS spider looks like with something other than Rotor aero rings.
Here you go:
Would look better without the missing chunk in the MAS spider, but seems they had to make that for the ANT+ communication.
Also note the chainring bolt on the left. On the 130BCD version this is nicely exposed. However on this 110BCD version it is half hidden by the power unit. Inserting and tightening the chainring bolt was a right PITA! I just about managed to squeeze a ball head 5 mm allen key through the gap, and tightened with the 6 mm bolt the other side.
roselend wrote:I (SRM user) installed one today. Although installation is not much different from a normal 3D crank, I must say, I'm impressed!
I also have been on SRMs for a few years, an old rock-solid PC5 SRM Pro. At the moment Wattage list feedback on the data from the Rotor Power has been mixed, so will be interested to see what mine produces.
Comparison unfair since that one is with Fiberlight chainrings. But definitely other Quarq options are lighter, for example S-Works (138 gram spider) or Cannondale versions, and this SRM is 698 grams.
Rotor gives you both sides, however. I'd like that since I have some physical assymetry (fitter gave me footbeds to help with that). But it won't help with pacing.
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Maybe they were coasting. They should try pedaling.micky wrote:On an italian forum some guys (4) are complaining about some issue; it seems the powermeter would happen to read 0 for long sections during the rides.
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