Narrow-wide chainrings are a game changer for single-ring drivetrains. Featuring built-in chain retention technology, the OneUp Narrow Wide Chainring allows you to run a 1x drivetrain without using a chainguide! The trick is the tooth profile consisting of alternating fat/skinny teeth to fit more closely into the narrow and wide plate spacing of a normal chain, "grabbing" the chain and holding it more securely.
This model of the OneUp fits Shimano XTR M9000/M9020 11 speed cranks and features a 12% ovality with a 115 degree clocking from the crank arm to put the major axis of the oval in your power stroke. This efficiently utilizes the strongest muscle groups to increase positive work, while picking up the slack in the weaker zones to reduce the negative work, smoothening out the rotation to a perfect spin.
Threaded for included M9 hardware. No M7 M9000/M9020 bolt pack required
Vital MTB - "The OneUp Traction Ring one of the simplest, most affordable, yet still impactful, upgrades you can make to your ride."
Oneup XTR M9000/M9020 Oval Chainring Features :
Provides more traction by smoothing out the torque delivered to the rear tire
12% ovality (32T is equal to a 30T-34T range)
115 degree clocking from crank arm puts the major axis in your power stroke
Narrow Wide tooth profile eliminates chain drop with the perfect chain mesh fit
Saves over 35g versus stock ring (32T)
Perfect chainline 49mm (corrected from stock 50.4mm) for a quieter drivetrain with improved chain wear and best drop performance
Includes shims to allow compatibility with your stock Shimano 1X or 2X hardware (no need to buy a new bolt pack)
Aggressive crud chamfers for awesome mud shedding performance and extended ring life
Reinforced Wide tooth design provides maximum ring durability when run without a bash
The oval ring - subtle. With the two tooth gain and loss I would recommend downsizing two teeth from what you would normally ride. Totally my opinion, but it's worth the couple extra bucks. Good durability, and not a single dropped chain so far. The included bolts are a huge plus too, mounting to the M9000 crank is a piece of cake.
Oneup does a great job with their rings, well made! There seems to be more machining and attention to details than the Absolute Black rings. It took me several hours before I felt like I was pedaling round circles again, now it feels normal. My single speed friend who uses this same ring says he feel like he's cheating with this oval ring.
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