absoluteBLACK Premium Round Road 110BCD 4B 39t Chainring Black

. Size (Mass +/-1g): 34T (30g), 36T (38g), 38T (43g), 39T (45g), 50T (114g), 52T (129g), 53T(136g) . Colour: Black, Grey (inner ring in black only) . Compatibility: In short EVERY Shimano 4 bolt crank. Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2 & all 9000 series, Ultegra 8000, R8020, R8050 & 8070 Di2 & 6800, 105- R7000, R7020, R7070, 5800, 4700. Di2 compatible. 10 / 11 / 12spd compatible. Use bolt covers for best appearance. . BOLTS: o For Outer chainring please order "Long bolts" from us OR our Bolt Covers o Changing Inner chainring only? use original bolts . Material & Finish: cnc machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing IMPORTANT: . Ramps on big rings are specially configured for combinations: 50/34, 52/36, 52/38, 53/39T . If you wish to use other configuration it will also work, but shifting will be slower and may require more "adjustments" of front derailleur to be acceptable. Also remember that front derailleur can only accept max 16T difference between 2 chainrings - this is how Shimano and Sram designed them. ADVANTAGES OF ABSOLUTE BLACK ROAD ROUND CHAINRINGS: . One of a kind look . Super stiff design due to thicker, 5mm construction . Bespoke Absolute Black 4 / 6 point ramp and recess shifting design shifts as crisp as original . Finest design that provides excellent strength to weight ratio