OVAL Boost DM Cinch Premium chainring for RaceFace
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The Original one and only absoluteBLACK Premium 1X RaceFace Boost compatible, narrow wide Oval chainring designed for RaceFace CINCH direct mount system. This version is for Boost bikes and FAT BIKES (when reversed). It is the most Premium oval chainring on the market with scientifically proven performance gains.
You can also check the same chainring in PVD Rainbow here.
" The oval rings continue to impress me and have made a genuine difference to my riding particularly as suffer from osteoarthritis in both knees. There does not seem to be as much stress on my knees and they don't ache when I have completed my rides. I am super impressed!"
" I had my AB chainring installed last week and after few hours of pedaling, boom, it hit me. This chainring made a big difference. My knees didn’t hurt, I felt faster on flats and uphill. "
" I’ll never go back to round. Super smooth, eased my knee pain, and has helped my climbs on technical ascents ten fold."
" Initially, reluctant. However, after riding my 29er I was very impressed with the power distribution and no knee pain. AB undoubtable got it nailed. You won't even know your are riding an OVAL after 15 minutes time."
" Super pleased with the overall look and performance of the chainring. I can 100% say that it does improve my pedaling while climbing and getting through rough uphill stuff. Each pedal stroke is now more fluid and cadence is better on those longer climbs."
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Size (Mass +/-1g): |
26T (52g), 28T (54g), 30T (58g), 32T (62g), 34T (69g), 36T (75g) |
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Color |
Black, Red, Gold |
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Compatibility |
RaceFace Cinch system cranks. RF Next SL G4, Next SL, Next R, RF SIXC, RF Turbine, RF Atlas, AEFFECT, RIDE CINCH cranks. Not compatible with Shimano HG+ chain and with Sram Flat Top chain |
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Material |
cnc machined 7075 Txxx Aluminum. Long-lasting construction |
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Finish |
type II anodizing |
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Chainline |
52mm. 3mm offset |
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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):
26T: 118mm ; 28T: 127mm ; 30T: 134mm ; 32T: 143mm ; 34T: 151mm ; 36T: 159mm
Advantages of our special Direct mount chainrings:
*We mastered our oval chainrings to perfection, so you can get best possible advantage from the oval/elliptical shape.
*Finest design to provide excellent weight to strength ratio
*One of a kind special oval shape (Patent Pending)
*Greatly improves traction and climbing abilities
*Unique Patent Pending narrow-wide teeth profiles to keep your chain in place for minimum 12 months!
*Special 3D teeth machining for ultimate mud relief decrease wear and noise dramatically
*They save weight because they don't need the spider and chainring bolts.
*The ability of installation of a smaller ring sizes that can't be mounted on regular spider.
*Superb quality and great look.
*You will ride faster using ovals. If you keep using round ring then others will get quicker.
*You will not "feel" the oval shape at all
*Reduces stress on knees
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.
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.
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.
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.
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Chain compatibility |
Not compatible with Shimano HG+ chain |
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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.