Box One™ Chain Tensioners are extruded then CNC-machined from 7075 aluminium for an 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 perfect adjustability. Fits most frames every time you remove and replace your wheel.

New and Improved
45mm of Adjustment
XO Skeleton Design
Dual-Sided Adjustment Grid
Dual-Colour Adjustment Block

Axle Size: 10mm (3/8") only
Material: 7075-T6 Aluminium
Hardware: Stainless Steel