The SRM Origin Carbon Track Power Meter combines lightweight carbon composite cranks with an accurate power reading spider. This helps track athletes maintain their ideal speed and use the data to improve. It is compatible with countless spindles and cranks but this one features a 24mm steel spindle. The carbon composite cranks are also incredibly lightweight and stiff to help get the speed you need on the track. Accurate to within 1 percent, you can always count on reliable readings. It also measures left/right balance and pedal smoothness so you can develop a more efficient pedal stroke. The SRM Origin Track Carbon Power Meter helps the fastest track riders go even faster.