absoluteBLACK oval rings are the only scientifically proven oval chainrings on the market. Oval chainrings don't produce more power, they increase your pedalling effectiveness. This means they reduce the component of your pedal pushing force, which doesn't contribute to moving your bike forward. The less force you waste the more energy you preserve, allowing you to push harder when it counts or simply reduce tiredness. 

absoluteBLACK Premium Shimano 9100/8000 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace R9100, Ultegra R8000 & 105 R7000. Super fast shifting and amazing smoothness of pedaling. (They can be also retrofitted to R9000 and R6800 cranks).10/11 spd compatible.

Features:

• One of a kind special oval shape (Patent Pending) - Superb quality and great look.
• Helps you climb easier and faster
• Number of teeth: 52T
• Compatible with: Shimano Dura-Ace R9100, R9120, R9150 & R9170 Di2 and Ultegra R8000, R8020, R8050 & R8070 Di2, 105- R7000, R7020, R7070. They can also retrofit all 9000 and 6800 series cranks but use bolt covers for best appearance.
• Bolts: for Outer chainring please order "Long bolts" from us OR Bolt Covers. Changing Inner chainring to oval only? Use original bolts.
• Ovality: 50T - 10-11.2%
• Ideal for 10/11 spd systems
• Over 15% stiffer than Rotor Qrings due to thicker, 5mm construction
• Bespoke Absolute Black 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring
• Finest design that provides excellent strength to weight ratio
• 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
• You will reduce chainring/cog shifts by at least 15%
• Material: cnc machined 7075 Txxx Aluminum.
• Long-lasting construction
• Weight: 137g
• Ramps on big rings are specially configured for combinations: 50/34 (and 52/36, 52/38, 53/39)
• 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.
• Absolute Black always recommends using a new chain when fitting new chainrings

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