Oval chainrings have been shown to improve traction and reduce leg fatigue Narrow/Wide tooth profile helps prevent dropped chains Ideal for 1x 9/10/11 system and single speeds 11 percent ovality Compatible with Sram X01, X1 and GX as well as other 94mm spaced cranks 7075 Aluminum construction 94mm 4-bolt 30T 7075AL Black 1/9/10/11/12sp Narrow/Wide ...