110 BCD Single Outer Chainring Fits: Shimano 4 arm for 9100 & 8000

Your Price: $139.99
Retail Price:$162.99
Your Savings:$23.00(14%)
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Part Number:FC-R9100B

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Mounting Size:

(110 mm BCD)


  • Up to 10% More Power
  • Up to 3 % More Speed
  • Up to 12% Less Lactic Acid Build UP!

  • Steel Shift Pins and ramps for crisper shifting 
  • Patented Design to Enhance Pedal Stroke Efficiency
  • Black Anodized 70/73 Aluminum Alloy hardend to T5
  • UCI Legal
  • Triathlete Magazine 2014 “BEST GEAR”
  •  2017 SHIMANO Dura Ace R9100 & Ultegra R8000 CRANKSET COMPATIBLE
Scientifically proven technology that enables athletes to ride harder, longer and faster with less fatigue.  By increasing the size of the gear when you push the hardest (downward stroke) and then decreasing the size of the gear to get through top and bottom dead zones quickly.  This patented curve enables the force on the pedals to be constantly proportional to the muscular force of the rider.

These new 2017 rings are only compatible with Shimano RC9100 crank arms and are also tuned for optimum shifting with a corresponding small chainring.  The 52 tooth ring is designed to only accept the 38 tooth small ring while the 50 tooth large ring is designed to perform with the 36 or 34 tooth small ring.

The chain rings varying diameter alters the effective gear ratio though out the pedal stroke, producing a higher gear on the downstroke when the rider has more power and then reducing the gear on the upstroke.  The ovalization factor is extreme, a 52 tooth ring equates to pushing a 54-55 tooth ring on the down stroke and a mere 49 tooth at the “dead spot” this translates to up to a 10% increase in power output which can result in up to a 3% increase in speed!

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