Wolf Tooth Elliptical 107 BCD Chainring for SRAM 42T Chainring

PowerTrac Elliptical (PTE) Elliptical Chainring Wide/Narrow for SRAM 107BCD Spider. The unique design makes it an elliptical ring that provides the benefit of 112 degrees top dead center after 10% (ellipticity) timing. Idle rotation in the "power zone" is reduced and natural pedaling in the "recovery zone" is possible. Wolf Tooth patented chainring. The wide side of the teeth has maximum contact on the drive side, distributing the load and extending chainring life. Narrow sides allow clearance for mud and debris and reduce friction. Alternating wide/narrow tooth pattern prevents the chain from falling off. Compatible chains: 9-10-11spd or 12spd SRAM Eagle, SRAM Flattop, Campagnolo, KMC, Connex, or Wippermann chains Drop-Stop B Weight: 86g Material: 7075-T6 aluminum Compatibility: SRAM 107BCD Spider (not compatible with PM-RED-D1 / PM-RED-1-D1 / FC-RED-D1 / FC-FRC-1W-D1 / FC-FRC-W-D1 / PM-RIV-W-D1 / PM-RIV-1W-D1 / FC-RIV-W-D1 / FC-RIV-1W-D1 / PM-RIV-D1 / FC-RIV-D1)