absoluteBLACK Road Oval Chainrings For Shimano R9100 / R8000

The absoluteBLACK Premium Oval Road Chainrings are designed for Shimano 110/4 BCD cranksets including Dura Ace R9100, Ultegra R8000 and 105 R7000, and can also be retrofitted to 9000 and 6800 cranks. Engineered for super fast shifting and exceptionally smooth pedalling, these chainrings are widely regarded as some of the most premium oval chainrings available. The optimised oval profile maximises the part of the pedal stroke where riders generate the most power while reducing resistance where less force is applied, resulting in smoother power delivery and improved pedalling efficiency. Compatible with 10, 11 and 12 speed drivetrains, they are available in 50T, 52T and 53T sizes in the distinctive Champagne or Rainbow finish.

Independent testing by the University of Primorska in Slovenia demonstrated measurable performance benefits when using absoluteBLACK oval chainrings. The study recorded up to 9 percent improvement in force effectiveness, 7 percent reduction in oxygen consumption, up to 15 percent lower respiration rate, and up to 10 percent reduction in heart rate. In practical terms, this allows riders to maintain the same power output for longer periods while using less effort, particularly noticeable during sustained climbs where oxygen levels fall and fatigue increases.

Unlike older oval designs such as Shimano Biopace, which used incorrect oval timing, absoluteBLACK chainrings feature precisely optimised ovalisation and clocking specific to each chainring size. This design complements human physiology, improving pedalling efficiency and helping smooth out imperfect pedal strokes. While often associated with professional racing, oval chainrings can offer even greater benefits for everyday riders by improving power delivery, reducing strain on the legs, and making long rides and climbs feel easier and more comfortable.

• One of a kind special oval shape that helps you climb easier and faster (Patent Pending)
• 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%
• Please note : Ramps on big rings are configured for specific combinations: 50/34, 52/36, 52/38, 53/39t. If you wish to use other configurations it will also work, but shifting will be sub-optimal, slower and may require more "adjustments" of the front derailleur to be acceptable.
• Teeth: 34T, 36T, 50T, 52T or 53T (select option)
• Colour: Red, Rainbow or Champagne