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Promax C-1 Chain Tensioner (BMX)
C-1 chain tensioners are extruded then CNC-machined from 6061-T6 aluminum for optimal strength and low weight. Two mounting holes ensure perfect adjustability on most frames. When used properly, they will protect your frame dropouts and help hold your rear wheel in place.
Available in anodized red, blue, gold and black with laser-etched graphics and stainless steel hardware.