Absoluteblack Black Absolute Premium Oval Dura Ace 9100 110/4Bcd Chainring - / 34 / 4 Arm, 110Mm / 12 Speed

AbsoluteBLACK

AbsoluteBLACK Premium Oval Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100 & Ultegra 8000 & 105 R7000. Compatible with Di2 These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. Same esthetically as older model.    IMPORTANT: These chainrings are also Backwards compatible for 9000, 6800. Mounting tabs are a little different in appearance from older model, but with use of dedicated 9000 or 6800 Bolt covers they look perfect. This is especially important for 53/39 combination as we only provide it under this category but can be retrofitted to 9000 and 6800 cranks.   Specification Size (Weight +/-1g): 34T (31g), 36T (37g), 38T (41g), 39T (42g), 50T (120g), 52T (137g), 53T(139g). Material: cnc machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing. Ovality: Optimized to each size separately. 34T- 6.5% ; 36T, 38T, 39T- 11.4%, 50/52/53T - 10-11.2% ; Timing of 108 -110.5° after TDC (top dead center) - Ideal for road climbing. Patent Pending. Bolts: For Outer chainring please order "Long bolts" OR Bolt Covers Changing Inner chainring to oval only? use original bolts.   Compatibility Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2 and Ultegra 8000, R8020, R8050 & 8070 Di2, 105- R7000, R7020, R7070. They can also retrofit all 9000 and 6800 series cranks but use bolt covers for best appearance. 10 / 11spd compatible..