PROMAX C-1 chain tensioners are designed for wheels with 10mm axle and for classic frame dropouts. They prevent derailment during your acceleration during BMX races. The 2 fixing holes and the tension adjustment by screw allow you an even more precise adjustment of the chain tension thanks to the control marks.
• CNC machined 6061-T6 aluminum
• Axle: 10mm
• 2 fixing holes
• Adjustment by a single screw with lock nut
• Weight: 64g
• Sold in pairs
• All classic frames with open rear dropouts