Box One™ Chain Tensioners are extruded then CNC-machined from 7075 aluminum for an optimal balance of strength and weight. A minimalist design adds style while reducing their overall mass. Laser-etched graphics that include wheel position guides and two 10mm mounting holes ensure perfect adjustability on most frames every time you remove and replace your wheel. When used properly, Box One tensioners will protect your frame dropouts and hold your rear wheel in place. Keep in mind, however, they aren’t indestructible (neither are your dropouts). Install these lightweight chain tensioners with care and leave the 15-inch breaker bar in your toolbox.
Profile Racings 10mm Axle chain tensioners are the perfect fit for racers looking to add a little flash to their chain tensioners
Surly SingleatorSpring loaded chain tensioner for running Single Speed on non-adjustable chain tension frames.Fit to rear mech hanger position.Surly Singulator features CNC alloy body variable chainline floating tension pulley stainless steel pivot bushing Triple sealed reversible spring.Compatible with 1/8' and 3/32' chains.11T jockey and slotted alloy chain rejection side plates.All in all... the mutts nutts of SS chain tensioners.