The Alienation Circle Jerks Chain Tensioners work like a reverse chain tensioner. These fill the space in front of the axle, in between that and the frame to hold the wheel straight and prevent it from shifting.

• Solid, non-adjustable chain tensioners compatible with any frame, chain and chainring combination
• Sold in pairs for 3/8″ or 14mm axles in various offset sizes
• Sturdy and dependable 6061-T6 alloy construction