Our Premium Sram compatible Oval chainrings (110/5bcd) are designed specifically for Sram cranks that have 1 hidden chainring bolt behind the crank arm like Sram Red, Red eTap, Red22, Force1, Force22, Rival, Rival1 and more. These are finest shift-able oval chainrings on the market. Both, inner and outer oval chainrings are optimized with smooth shifting in mind. This is why the back of the Absolute Black Oval road chainring does not feature cutouts, like other oval products on the market. Instead, we design smooth angled surfaces, to help chain to slide quickly and precisely between chainrings. Absolute Black outer oval chainrings have 6 up-shifting ramps, for easy and quick gear change, even under load. Each outer chainring also features 12 down-shifting points. Instead of steel shifting pins we use a CNC machined ramp and recess solution. Special raised ramps work in conjunction with the tooth recesses to stabilize the chain when shifting. Our oval chainrings DO NOT require any modification to the (standard) front dérailleur in order to work properly. Absolute Black Road Oval Sram chainring 110bcd Features Material: CNC machined 7075 Txxx Aluminum. Long-lasting construction Mounting: 110 BCD x 5 Bolts: Reuse original Sram bolts except the hidden bolt. AB Outer chainring comes with the hidden bolt in the package. If changing inner chainring only - reuse all original bolts. Ovality: Optimized to each size separately. 34T- 6.5% ; 36T- 11.4%, 50/52 - 10.3% ; Timing of 108 -109.5° after TDC (top dead center) - Ideal for road climbing. Patent Pending. Advantages of Absolute Black Oval chainrings: Size (Weight): 34T (31g) 36T (36g) 50T (119g) 52T (131g) One of a kind special oval shape that helps you climb easier and faster (Patent Pending) Over 15% stiffer than Rotor Qrings due to thicker, 5mm construction Bespoke AbsoluteBlack 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring You will not feel the oval shape while pedaling Your pedaling action will feel smoother Helps reduce stress on knees and helping your legs remain fresher for longer You will be able to maintain better cadence while climbing Reduces possibility of leg cramps