The original, one and only
Narrow Wide AbsoluteBlack Boost Direct Mount Oval Chainring for Race Face 12V Cranks, a narrow and wide oval chainring designed for the RaceFace CINCH Direct Mount System. This version is designed for Boost and Fat Bikes. It is the most premium oval chainring on the market with scientifically proven performance gains.
Oval chainrings do not produce more force, they increase pedaling efficiency through better force transmission. That is, you won't necessarily go farther by pedaling harder. But the less force you will lose, the more energy you will keep, allowing you to pedal harder when necessary and thus reducing your general fatigue. That's why you can ride faster, longer and farther with oval chainrings.
Studies conducted by the University of Primorska, Slovenia, show significant differences between using
AbsoluteBlack Oval chainrings and conventional round chainrings. It is proven that using an oval chainring can provide up to a 9% increase in pedal stroke efficiency, up to 7% less oxygen consumption, 15% less breathing and up to a 10% decrease in heart rate.
Details
- Weight: 26D (52g), 28D (54g), 30D (58g), 32D (62g), 34D (69g), 36D (75g)
- Color: Gold
- RaceFace Cinch crank compatibility. Cranks RF Next SL G4, Next SL, Next R, RF SIXC, RF Turbine, RF Atlas, AEFFECT, RIDE CINCH.
- Compatible with all SRAM GXP / BB30 Largo / DUB cranksets with direct mount.
- Not compatible with Shimano HG+ chain.
- For 10 / 11 / 12 speeds.
- CNC machined 7075 Txxx aluminum material. Long life construction. Type II anodized finish.
- Chain line 52 mm.
- 3 mm offset
- The most advanced patent pending tooth profile on the market guarantees a minimum of 12 months of excellent chain retention capabilities.
- Designed in the UK. Made in Poland (EU).
- Ovality: optimized for each size separately. Range: 10.2-14.4% and 110.5-116.3° after TDC (top dead center) Patent pending.
The difference between Boost148 chainrings and non-Boost chainrings is only the offset and dip of the chainring itself. You will use the same crank on both Boost and non-Boost bikes, but the offset of the chainrings must be different to accommodate the chainstay clearance. Boost chainrings only have a 3mm offset while non-Boost chainrings have a 6mm offset.
If you would like to check the frame clearance with a new oval plate, below is the measurement of the largest dimension of the oval (tip to tip of the tooth): 26D: 118 mm; 28D: 127 mm; 30D: 134 mm; 32D: 143 mm; 34D: 151 mm; 36D: 159 mm.
BENEFITS OF OUR OVAL PLATE FOR 12V RACE FACE CRANKS
- We've mastered our oval platters to perfection, so you can get the best possible benefit from the oval/elliptical shape.
- Very slim design for an excellent strength-to-weight ratio.
- Unique special oval shape (patent pending).
- Greatly improves traction and climbing ability
- Unique narrow and wide tooth profiles (patent pending) to keep your chain in place for at least 12 months!
- Special 3D machining of the teeth for ultimate mud relief, which greatly reduces wear and noise.
- They save weight because they don't need the spider and chainring bolts.
- The ability to install a smaller ring size that cannot be mounted on the regular spider.
- Exceptional quality and look.
- You will ride faster using the ovals. If you continue to use round rings, the others will be faster.
- You won't feel the oval shape at all.
- Reduces stress on the knees
- The oval chainring does not compromise the work of the rear derailleur clutch mechanism. It also does not require a chain tensioner when used in Singlespeed
HOW TO MOUNT THE ABSOLUTEBLACK OVAL PLATE TO THE RACEFACE CINCH:
The plate has a mark on the back that you need to align with the center of the crank arm to get the main/recommended position. Once this is done, use the BB key to lock the platter. If you want to try a more aggressive configuration, rotate the chainring from the main position clockwise one notch on the splines. This will rotate the oval an additional 22 degrees. We do not recommend the second position for beginners. Before you start experimenting with chainring timing, make sure you have ridden at least 5 months in the main position.
HOW TO MOUNT THE ABSOLUTEBLACK OVAL ON A FAT BIKE:
On Fat Bikes using 26 or 28D chainrings, it is necessary to reverse the chainring dish. The 26 and 28D chainrings have a double recessed mark on the front that you must align with the center of the crank arm to get the correct position. All other steps are identical to the instructions above.
OPTIMAL PLATE ADJUSTMENT:
Our main/recommended timing position is a fantastic setup for everyone. However, some more experienced racers may prefer a slightly more aggressive timing position. The RaceFace oval platter allows you to change the timing position 22 degrees in either direction from the initial setting. It's the only chainring in our lineup that offers this adjustability.
Is a chain guide necessary? No. But if you want one, the guide bar must be 2 teeth larger than the nominal size of the oval chainring.
* Always use a new chain with a new chainring.
MORE INFORMATION