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O.Symetric Osymetric Chainrings - NEW 2017

Price AU$240

Barry (Private Seller)

Canberra, ACT

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Osymetric Chainrings - Improved Pedalling Efficiency.
Get the best out of your pedalling power by using the increasingly popular Osymetric chainring set. New design now with ramps and pins for improved upshifting.

Product Details

  • Discipline: Road
  • Improves pedalling efficiency
  • Different size kits available
  • Fit Shimano (4 & 5 Bolt) Sram etc
  • Easy to fit


Available kit sizes include:
38-50 teeth 110mm (BCD 5 bolt) (compact )
38-52 teeth 110mm (BCD 5 bolt) (compact )
42-52 teeth 130mm (BCD 5 bolt)
42-54 teeth 130mm (BCD 5 bolt)
44-56 teeth 130mm (BCD 5 bolt) TT

KITS ARE ALSO AVAILABLE FOR SHIMANO DURA ACE 9000, ULTEGRA 6800 and 105 5800 4 BOLT CRANKS - CONTACT FOR DETAILS & PRICING (ring sizes include 34, 36, 38, 42, 44, 50, 52, 54 & 56)

Osymetric chainrings are not symmetrical as with other non-round chainrings. The radius of the chainring varies in proportion to the amount of power available from a riders legs at various pedal positions. It looks unusual, but it works.
Studies have shown that the power of the leg is two times lower at the top dead centre (TDC) and bottom dead centre (BDC) than available on the power downward strike. The aim of an Osymetric chainring is to reduce the radius of the chainring at TDC and BDC so that it is easier to pedal through these positions and the leg has some time to recover during each pedal stroke.
A 54 teeth Osymetric chainring is equivalent to approximately a 50 teeth round chainring at TDC/BDC and equal to 58 teeth on the downward stroke. Likewise, a 52 teeth chainring is approximately equivalent to 48 at TDC/BDC and 56 on the downward stroke.
The benefits have already been taken up by a number of riders in the pro peloton.
My own tests have confirmed the benefits. I tested the Osymetric 50T against a round 50T chainring, with a 5 minute constant power test (at 60% of maximum power). The results were:
1 - Heart Rate on the round chainring at constant power was 5.4% higher than on the Osymetric.
2 - Cadence on the round chainring at a set constant power was 8.7% higher than on the Osymetric.

As you can see, using the Osymetric chainring requires substantially less energy to maintain the same power output than on a same size round chainring. Ideal for road, TT or track applications.
Made from 3mm and 4mm quality anodised aluminium suitable for all 10 or 11 speed chain combinations. Fitting and derailleur adjustment instructions provided. Black only.
Check out the information on the manufactures web site , search for Osymetric.
$240 delivered to any Australian address