NOTE: Secondary images are intended as examples of the benefits Absolute Black Oval chainrings in general and do not necessarily represent colour and configuration of chainring selected. Please refer to product code and description. Our premium 1X Sram Direct mount Oval GXP chainrings are designed for GXP and LONG BB30 spindle cranks. Fits Sram XX1, X01 and others. Also replaces 76bcd chainrings to convert to direct mount solution. Size (Mass +/-1g): 26T (48g), 28T (50g), 30T (55g), 32T (59g), 34T(66g), 36T?(look at CX category) Color: Black Compatibility: SRAM XX1, XX1 Eagle, X01, X01 Eagle, X1-1400, GX-1400, X0, X9, X7, S2210, S1400 and Truvativ Descendant cranks. GXP® and Long spindle BB30 models (15mm spacer on drive side) 9-10-11-12spd. Material: cnc machined 7075 Txxx Aluminum. Long-lasting construction Chainline: perfect 49mm (improved) Ovality: Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3° after TDC (top dead center) Patent Pending Oval chainrings work because a rider does not produce power evenly through a pedal stroke; they maximize the part of the stroke where power is produced and minimize resistance where it isn't. Oval rings make the spin cycle a lot smoother and are easier on legs while climbing. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. You will actually feel your stroke to be more "round" with an Oval shape than with a round chainring. Why it matters? Traction, Traction and Traction. With oval rings rear tire traction improves greatly on loose and slippery terrain. Your legs will be less tired and your speed improved. Climbing will become easier then ever before. It is world's best oval chainring. 34T Oval chainring has an ovality of 32/36T and is best for someone who uses currently 33 or 34T round ring. The most advanced, Patent Pending narrow/wide tooth profile ever produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.