absoluteBLACK Oval Premium Shimano R9100/8000 110BCD 4 Bolt Double PVD Coated Chainring

absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings in PVD Rainbow (oil slick) color are designed for new type of Shimano cranks Dura-Ace 9100, Ultegra 8000 & 105 R7000. Super fast shifting and amazing smoothness of pedaling. (They can be also retrofitted to 9000 and 6800 cranks). It is the most Premium oval chainring on the market with scientifically proven performance gains. 10/11/12spd compatible.

Specifications

• Size (Mass +/-1g): 34T (31g), 36T (37g), 39T (42g), 50T (120g), 52T (137g), 53T(139g)
• Colour: PVD Rainbow
• 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 / 11 / 12spd compatible.
• BOLTS: For Outer chainring please order "Long bolts" from us OR Bolt Covers.  Changing Inner chainring to oval only? use original bolts.
• Material & Finish: cnc machined 7075 Txxx Aluminum. Long-lasting construction. Physical Vapour Deposition
• Ovality: Optimized to each size separately. 34T- 6.5% ; 36T, 38T, 39T- 11.4%, 50/52/53T - 10-11.2% ; Timing of 108 -110.5deg after TDC (top dead center) - Ideal for road climbing. Patent Pending.

Important

• Ramps on big rings are specially configured for combinations: 50/34, 52/36, 52/38, 53/39T
• 34t Premium Series inner chainring is not compatible with power meters which use circular spider (SRAM Quarq, Power2Max, etc) . For those power meters please choose our Silver Series 34t inner oval.
• 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.
• Absolute Black always recommends using a new chain when fitting new chainrings.

Advantages :

• 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
• educes possibility of leg cramps
• *You will reduce chainring/cog shifts by at least 15%