Sigma R3 Speed / Distance / Heart Rate Transmitter - Black Pull_Dual It features a tough aluminium

It features a tough aluminium construction which makes it ideal for handling the most aggressive of the trails

8mm handlebar clamp size

simplified assembly and maintenance: Ultra-Torque™

Rotor: Centerline

All conditions

Sigma R3 Speed / Distance / Heart Rate Transmitter - Black Pull_Dual It features a tough aluminiumSigma R3 Speed Distance Heart Rate Transmitter Black The R3 transmitter enables you to measure your speed, distance and heart rate in a single device. The SIGMA STS Run wireless technology sends digitally coded data packages to the receiver within the running computer. All in One SPEED DISTANCE HEART RATE The R3 transmitter uses an integrated three axis acceleration sensor to measure acceleration throughout the run and accurately measure speed and