RACEFACE CINCH OVAL BOOST – FOR HG+ 12 SPEED
This particular chainring will ONLY work with CN-M9100, 8100 & 7100 Hyperglide+ 12spd chain due to different thickness and shape of the teeth. 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 specific bikes and FAT BIKES (when reversed).
Size (Mass +/-1g):
30T (58g), 32T (62g), 34T (69g)
RaceFace Cinch system cranks. RF Next SL G4, Next SL, Next R, RF SIXC, RF Turbine, RF Atlas, AEFFECT, RIDE CINCH cranks. Shimano 12spd Hyperglide+ chain only
cnc machined 7075 Txxx Aluminum. Long-lasting construction
52mm. 3mm offset
Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3Â° after TDC (top dead center) Patent Pending
Difference between Boost148 and non-boost chainrings is in the offset/dish of the chainring itself only. You would use same crank in both boost and non-boost bikes, but chainring offset has to be different to accommodate chainstay clearance. Boost chainrings have only 3mm offset while non-boost ones 6mm.
If you wish to check for frame clearance with new oval ring, below you can find measurement of biggest dimension of the oval (tip to tip of tooth):
30T: 134mm ; 32T: 143mm ; 34T: 151mm