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AbsoluteBlack Premium Oval Road 110x4 BCD Chainring for Shimano Dura Ace / Ultegra Cranks 12 S Grey


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AbsoluteBlack Premium Oval Road 110x4 BCD chainrings are designed for Shimano Dura-Ace 9000, Ultegra 6800 & 105 5800 cranks. Superfast shifting and amazingly smooth pedaling. This is the most premium oval chainring on the market with scientifically proven performance gains.

Oval chainrings don't produce more power, they increase pedaling efficiency through better power transmission. This means that you won't necessarily go further by pedaling harder. But the less force you lose, the more energy you keep, allowing you to pedal harder when you need to and thus reducing your general fatigue. That's why you can ride faster, longer and further with oval chainrings.

Studies conducted by the University of Primorska, Slovenia, show significant differences between the use of AbsoluteBlack Oval chainrings and conventional round chainrings. It is proven that using an oval chainring can provide up to a 9% increase in pedal stroke efficiency, up to 7% less oxygen consumption, 15% less breathing and up to a 10% decrease in heart rate.

Details : 
  • 10 / 11 / 12 Speed compatible.
  • Weight : 34T (31g), 36T (37g), 38T (41g), 50T (120g), 52T (137g), 
  • Color : Grey (inner ring in black only) Screws are available in black only.
  • Compatibility : Shimano Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700. Compatible with Di2 & Pioneer, SRM and other power meters.
  • Screws: For the outer chainring, please order long screws or screw covers. If you change the inner platter to an oval platter, use the original screws.
  • Material : CNC machined 7075 Txxx aluminum. Long life construction. Type II anodizing
  • All Absolute Black products are designed in the UK and manufactured in Poland (EU)
  • Ovality: optimized for each size separately. 34D- 6.5%; 36D- 11.4%, 38D- 11.4%, 50/52D - 10.3%; Timing 108 -109.5° after TDC (top dead center) - Ideal for road climbing. Patent Pending
  • The 34t Premium Series inner chainring is not compatible with power meters that use a circular spider (SRAM Quarq, Power2Max, etc.). For these power meters, please choose the Silver Series 34t oval inner chainring.
  • A unique oval shape that helps you climb easier and faster (patent pending).
  • 15% more stiffness than Rotor Qrings due to a 5mm thicker construction.
  • Absolute Black's ramp and 6-point recess design allows for better shifting than any other brand or model of oval chainring.
  • The slimmest design offers an excellent weight to strength ratio.
  • You won't feel the oval shape when you pedal.
  • Your pedaling action will be smoother.
  • Helps reduce stress on the knees and helps your legs stay cooler longer.
  • You will be able to maintain a better cadence when climbing.
  • Reduces the risk of leg cramps
  • You will reduce chainring and sprocket changes by at least 15%.

To make the adjustment you will need 2 mm and 5 mm Allen keys.

Troubleshooting :
  • If your derailleur is sticking out of the chain from the small chainring to the large chainring, this means that your "gap" is greater than 2 mm when the chain is on the large chainring (see video). You may need to reduce the gap. Your front derailleur may also be too high compared to what is recommended in the video.
  • If your front derailleur is hesitating to move from the small to the large chainring, there may be two problems. The gap may be too small (it should be 2 mm - see video) or your cage is not parallel to the face of the large chainring.


First of all, you need to remove the crank from your bike. Once removed, unscrew the 4 screws that hold the two chainrings together with a T-30 torx key. Remove the two original rings. Locate the new oval inner chainring with the triangular timing indicator positioned behind the crank arm. The screw holes in the small chainring are recessed so the nut heads are flush with the surface of the chainring, these recesses should be facing you when fitting the screws. AbsoluteBlack outer chainrings have a specific recess to accommodate the rear edge of the crank arm - position the outer chainring to align this recess with the crank arm. If you are only replacing the inner plate with an oval plate, use the original screws supplied with your crank. If you are switching to a pair of oval rings, you will need a set of ordinary "double" chainring screws. Tighten the four screws to about 5-7 Nm. Reassemble your crank on the bike. You may also need to adjust the front derailleur upwards by 2-3 mm.

* We always recommend using a new chain when fitting new chainrings.



Position External
BCD 110
Tooth 52
Speed 12




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