Absolute Black

RaceFace BOOST Direct Mount Chainrings for 12SPD Hyperglide+ Chain

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  • MSRP $78.00


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)

Color

Black

Compatibility

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 oonly

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


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


    HOW TO MOUNT RACEFACE CINCH OVAL CHAINRING:

    The chainring has a mark on the backside that you need to line up with the center of the crank arm to achieve the main/recommended position. Once this is done use BB key to lock the lockring. If you wish to try more aggressive setup, rotate the chainring from main position clockwise by one notch on the splines. This will rotate oval by further 22deg. We do Not recommend second position for beginners. Before you start experimenting with the clocking of the ring, make sure you ridden minimum 5 months in the main position first.

    raceface cinch oval how to mount the oval chainring to RF cinch cranks

     

    HOW TO MOUNT RACEFACE CINCH OVAL CHAINRING ON FAT BIKE:

    On Fat Bikes using 26 or 28T chainrings, it is necessary to reverse the chainring dish. 26 and 28T chainring has a double-dimple mark on the front that you need to line up with the center of the crank arm to achieve proper position. All other steps are same to the instruction above.

    raceface cinch oval how to mount the oval chainring to RF cinch fat bike cranks

     

    OPTIMUM CHAINRING ADJUSTMENT (OCA):

    Our main/recommended clocking position is a fantastic setup for everyone. However some more seasoned riders may like a bit more aggressive clocking position. RaceFace oval chainring allows you to change clocking position by 22deg both ways from initial setup. This is the only chainring in our line offering this adjustability.

    It is ideal for 1x 9/10/11/12 system and Singlespeeds!. Oval (elliptical) chainring does not compromise the work of clutch mechanism in rear derailleur(video at the bottom). It also does not require chain tensioner when using in Singlespeed application. It is the most advanced oval chainring currently on the market.

    The most advanced, Patent Pending narrow/wide tooth profile on the Market guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.

     

    Chain options

    10, 11 or 12spd chain for geared bike or 6-9 spd for SS. If used in 1x9 drivetrain - 10spd chain must be used to obtain the performance. (yes - 10spd chain will work great on 9spd cassette)

    Chainguide needed?

    No. But if you want one then chain guide should have 2 teeth more capacity than nominal oval ring size.

     

    Designed in UK. Manufactured in Poland (EU).

    PRESS REVIEVS:

    PINKBIKE Review - Oval Chainring for Race Face Cinch

    Bikerumor - ovalized Race Face Cinch direct mount narrow/wide chainring

    RaceFace is trademark of RaceFace corporation

    The World's lightest oval (elliptical) RaceFace spiderless traction chainring - period!. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings. Traction chainring.


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