Wolf tooth Oval Shimano DM 12-speed Chainring Shimano's new XTR 12-speed Hyperglide+ chain works a little differently than any other chain on the market. In order to ensure perfect operation, Wolf Tooth developed a completely new tooth profile to provide optimal chain retention and durability when using the new chain technology. Oval rings spin smoother and promote optimal power transfer, eliminating dead spots in the pedal stroke. Features The new HG+ chain interacts with the chainring much differently than a traditional wide/narrow design. Wolf Tooth engineers spent the time to understand how the system works and designed a new tooth profile that is optimized for this system. Engineered proprietary tooth profile maintains the quiet and smooth performance of the HG+ drivetrain with legendary Wolf Tooth chain retention. Prevents premature ring and chain wear that can come from non-optimized profiles. Specifications Compatible with Shimano 12-speed Hyperglide+ chains Compatible with Shimano DM cranksets Material: 7075-T6 Aluminum | Wolf Tooth Components | Oval Dm Shimano 12Spd Ring 32T, Boost | Aluminum