Our premium 1X RaceFace Boost 148 direct mount narrow wide Oval chainrings are designed for CINCH system RaceFace uses to mount chainring directly to the crank. This version is for BOOST 148 specific bikes and FAT BIKES (when reversed). Optimized to work perfectly with Eagle 12spd. It also works great with 10/11spd. .
Specifications:
– Size (Mass +/-1g): 28T (54g)
– Material:cnc machined 7075 Txxx Aluminum. Long-lasting construction
– Finish: type II anodizing
– Chainline: 52mm. 3mm offset
– Ovality: Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3° after TDC (top dead center) Patent Pending








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