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MAHLE Smartbike Systems X20 TCS Bottom Bracket BB86 With Torque Cadence Sensor Weight 105 Competition grade derailleur with the 210000161822 Competition grade derailleur with the Yaw design which does not to be trimmed as chain moves across rear cogs Model Demon II ADD Black Flag Ep Description Axle (Alloy) 135 142mm MAHLE TCS (torque and cadence sensor) bottom bracket helps riders conserve battery by measuring the power input from the rider and adjusting the support from the motor accordingly 95% (+ 5% of tolerance)
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