Oneup 104 BCD Oval Narrow Wide ChainringNarrow-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 is compatible with 9, 10, 11 Speed Chains and 104 BCD cranks. It also 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 requiredREVIEWSVital MTB - "The OneUp Traction Ring one of the simplest, most affordable, yet still impactful, upgrades you can make to your ride." Oneup 104 BCD Oval Narrow Wide Chainring Features :Provides more traction by smoothing out the torque delivered to the rear tire12% ovality (32T is equal to a 30T-34T range)115 degree clocking from crank arm puts the major axis in your power strokeNarrow Wide tooth profile eliminates chain drop with the perfect chain mesh fitSaves 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 performanceIncludes 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 lifeReinforced Wide tooth design provides maximum ring durability when run without a bashMade from 6mm hard wearing 7075-T6 aluminum plateReuse your existing 8-10mm long ring hardware. No new bolt packs required, saves you $15Oneup 104 BCD Oval Narrow Wide Chainring Specifications :Material: 7075-T6Weight: 49g (32T)Compatible with: 9, 10, 11 Speed Chains and 104 BCD cranksColors: Black