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absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100 & Ultegra 8000 only. These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. (They can be also retrofitted to 9000 and 6800 cranks). 10/11/12spd compatible.
Compatibility:Shimano Dura-Ace 9100, R9150 Di2 and Ultegra 8000, R8050 Di2. They can also retrofit 9000 and 6800 cranks but use bolt covers for best appearance. 10 / 11 / 12spd compatible.
Materials: CNC machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing
Mounting: 110 BCD x 4
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.
Advantages of Absolute Black Road Oval chainrings:
IMPORTANT: amps 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 dérailleur to be acceptable. Also remember that front dérailleur can only accept max 16T difference between 2 chainrings - this is how Shimano and Sram designed them.
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Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.
Incredible piece of engineering ! Pedaling is more efficient, holding watts and cadence has never been easier. Going farther and quicker with no extra effort. And they are beautiful ;-) Love my ovals.
The chainring is great and look great but doesn’t fit stage power meter (right side obviously). I had to re-machined the ring in order to accommodate the head of the stage power meter. AB should have looked into it when designing the ring. Beside that, it is very nice, light and well made. I will need a bit more time to see if it improves anything on the performances side.