MKS BMX Chain Tensioner

These tensioners are compatible with standard 9.5mm and 10mm axles, which covers the vast majority of BMX and track-style hubs.

They are designed specifically for rear-facing horizontal dropouts. As long as your dropout thickness is 8mm or less, these will provide a secure fit.

While horizontal dropouts allow for some adjustment, they can slip under high torque, causing your chain to go slack or your wheel to misalign. These tensioners lock the wheel position in place, ensuring consistent chain tension and preventing the wheel from pulling forward during hard pedaling.

Investment casting creates a stronger, more uniform metal part compared to stamped steel alternatives. This makes the tensioner significantly more resistant to bending or snapping under the heavy stress of aggressive riding.

Yes, it is highly recommended to use one on each side of the rear wheel. This ensures the wheel remains perfectly centered in the frame, which is critical for proper drivetrain alignment and handling.