OSYMETRIC CHAINRING SET For Shimano Dura Ace R9100 Ultegra R8000 model 4 Bolt Crank Sets. Osymetric is Celebrating Winning 5 from the last 6 TDF Grand Tours & Vuelta 2017. Osymetric Chainrings Improve Your Pedalling Efficiency. Get the best out of your pedalling power by using the increasingly popular Osymetric chainring set, NOW for new Shimano 4 bolt crank sets Dura Ace R9100 and Ultegra R8000 series cranks. The genuine Osymetric has now improved their functionality with the addition of ramps and pins for improved up shifting.
The new design is made of 3.5mm for small chainrings and 4mm for large chainrings quality anodised aluminium suitable for the above 11 speed Shimano cranks. All chainrings for Shimano 4 bolt designs are 110mm BCD and come in kits with one inner ring and one outer ring. Ring set sizes currently available.Order your preferred chainring set and receive a fitting kit including free chain catcher. 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 stroke. 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 52 teeth Osymetric chainring is equivalent to approximately a 48 teeth round chainring at TDC/BDC and equal to 54 teeth on the downward stroke. The benefits have already been taken up by a number of riders in the pro peloton with great success. 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, ITT and triathlon applications. Check out the information on the manufactures web site. The item "Osymetric Chainring Set Shimano Dura Ace R9100 Ultegra R8000 Road TT Tri" is in sale since Sunday, July 23, 2017. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Chainrings & BMX Sprockets". The seller is "cantravel" and is located in Curtin, ACT. This item can be shipped worldwide.