SRM Training System Edition Track

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	Made to offer precise power output measurements for training or racing on the velodrome, the SRM Track System has been redesigned for 2011. Now 20 grams lighter with increased stiffness and more frame clearance. The chainring bolts mount directly into the PowerMeter, and the unit accepts Shimano Octalink cranks ranging from 165 mm to 175 mm. Offered Wired and Wireless! NEW: The Powermeter has two reed switches for a shorter lag time until recording data. Crank: SRM Aluminum to fit the Shimano Dura Ace Track FC7710 Cranks are available in lengths of between 165 - 180 mm Chain Rings: Bolt Circle Diameters: 144 mm, 5-arm - not included 41 to 53-tooth chainrings are available, you can mount either one or two chainrings. Bottom Bracket: e.g. BB7700 (173 g) - not included Weight: 931 g with PowerMeter, cranks and bottom bracket (173 g) without chainring Strain Gauges: 8 Cadence Range: 30-255 rpm Wattage Range: 0-4096 Watts Wireless Protocol: Wireless ANT+ Sport Accuracy: +/- 0.5% Battery Life: 1400 hours of use Q-Factor: 141 mm Compatible wireless with PowerControl 7 and PowerControl VI. 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.