The Gen 3/4 Freewheel and Torque Sensor Assembly is an integrated torque sensor module that is assembled with the freewheel where the casing is a part of the right side bottom bracket cup. 

Compatibility:

• X1 Pro Gen 3 / X1 Pro Gen 4
• X1 Stealth Gen 3

Inclusions:

• Gen 3/4 freewheel
• Gen 3/4 torque sensor
• Gen 3/4 right side bottom bracket cup