Largest gearset available for X1 Pro Gen.4 motor. Includes:

• 40T wide-narrow steel bicycle chainring
• 72T aluminum motor sprocket
• Aluminum chain guard
• All necessary bolts, nuts, and spacers for mounting to freewheel arm

Also includes 46-link wide 219H gold chain.

Technical specifications

• Drive compatibility: X1 Pro Gen.4
• High quality, precision machined
• Material: 6061-T6 aluminum

This gearset enables high-speed riding with increased torque from the large 72T motor sprocket. Check for potential frame interference due to the 170 mm diameter of the 40T chainring.
Note! Spacer kits differ between BSA and BB92. Contact us before ordering to specify bottom bracket type.
Can be purchased separately or as part of full X1 Pro Gen.4 kit instead of standard 53T/32T or 63T/38T setups.
Technical notes: click here.