Box One Chain Tensioner 10mm X 2 Axle Hole

Box One™ chain tensioners are extruded and then CNC machined from 7075 aluminum for the optimal balance of strength and weight. A minimalist design adds style while reducing their overall mass. Laser-etched graphics include wheel position guides and two 10mm mounting holes with 15mm of adjustment to ensure a perfect fit. They fit most frames every time you remove and replace your wheel.

When used correctly, Box One chain tensioners will protect frame dropouts and hold your rear wheel in place. Keep in mind, however, that they are not indestructible (just like your frame legs). Install these lightweight chain tensioners with care and leave the 15-inch breaker bar in your toolbox.