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@andypancake
Have to disagree... porn worthy in my book. You just have to read the specs!
The SRM training system track version was designed for use on cycling tracks to measure true power output in watts during your training sessions or competitions under real conditions. The system also helps you choose the best possible aerodynamic sitting position. The SRM Training System track version is available in the Professional model only. NEW: The Powermeter has two reed switches for a shorter lag time until recording data
Measurement accuracy:
The track Powermeter is only available as a Professional model (8 strain gauges) with a measurement accuracy ±0.5%.
Cranks:
165mm to 175mm to fit the Shimano Dura Ace Track FC7710
Chainrings:
5-arm with a 144mm bolt circle. 41 to 53-tooth chainrings are available, you can mount either one or two chainrings.
Weight:
The track Powermeter with a 53 chainring and a 175mm crank weighs 640g.
Special:
The Vario bore holes on the outer side of the Powermeter allow you to mount two chainrings. With this option and the respective crank you can also use the track Powermeter for training on the road. Shimano track cranks also fit on Shimano Octalink 109.5mm road inner-bearings.