Trainsharp Recommended Products
Osymetric Chainrings - UK distributor
-
10% more power output for the same efforts!
-
10% increased efficiencies and speed
-
10% less muscle acidity
Better long term muscle development and recovery
-Improve your Climbing,Sprinting and Time Trial Ability .
-
£205 per 'Standard' pair
-
£240 per TT Specific pair
- single rings available
"Round rings are biomechanically wrong for you – they have dead spots!” – Jean-Louis Talo (inventor and founder of O’Symetric)
for all enquiries - please call 0044 (0)1892 731367
TT specific rings 44–54T
Compact rings 38–50T and 38–52T Colours Black or Silver
* NEW - 3mm specific Time Trial ring - 52,54 or 56 - £130
Latest Achievements with Osymetric Chainrings
- David Millar won Criterium International TT and The 3days de Pann with O’Symetric 2010.
- David Millar won Common Wealth Gold in the TimeTtrial, Common Wealth Silver in the Road Race and World Time Trial Championship Silver using O’Symetric.
- Bradley Wiggins ~ 4th in the 2009 TDF and wins the Giro D’Italia opening TT stage 2010 using O’Symetric rings
- Geraint Thomas wins the British National Road Race Championships and has an outstanding Tour De France performance 2010.
- The Swedish Elite Time Trial champion Alex Wetterhall wins the notoriously difficult Irish Stage Race – RAS 2010 on O’Symetric.
-
Team Radio Shack Rider and lieutenant to Lance Armstrong in the mountains - Janez Brajkovic - rides O’Symetric in the 2010 Tour De France.
-
TrainSharp, the cycle coaching company set up last year by Jon Sharples, has reached a distribution agreement with the French company O.Symetric to sell their unique chainrings in the UK.
O.Symetric first rose to prominence when Bobby Julich used their chainrings to land a bronze medal in the 2004 Olympic Time Trial and later to contribute to his CSC’s team time trail win in the 2005 Tour of the Mediterranean. More recently they have been spotted on Bradley Wiggins’ bike in this year’s Tour of Mercia fitted to his new Pinarello time trial bike. Wiggins finished the 22km time trial stage in third place behind Frantisek Rabon and Denis Menchov. He also used them to good effect in last year’s Paris-Nice.
The O.Symetric chainrings are asymmetric and are designed to eliminate the ‘deadspot’ in a rider’s pedal stroke. The idea is that the sector of the pedal stroke where the crank is horizontal, or nearly so, is where you can push hardest, so it makes sense to increase the gear at that point, then drop it to get your foot through top and bottom dead center quickly. The principle is that the force on the pedal is constantly proportional to the muscular force of the rider.
Osymetric Chainring Efficiency
The chainring’s varying diameter alters the effective gear ratio throughout the pedal stroke, producing
a higher gear on the downstroke where the rider has more power, and reducing the gear on the upstroke. The ovalisation factor is quite radical on O.Symetric chainrings and a standard 52T ring equates to pushing a 57T on the downstroke and a mere 47T at the ‘deadspot’. Figures for the 42T inner ring equate to 46T and 38T respectively.
As a consequence, O.Symetric claim a 5 to 15% increase in power output which corresponds to a 3% speed increase. Laboratory and road tests have been carried out to quantify the benefits, including one where Christophe Moreau and Laurent Brochard rode a 30.5km route from Bourg St Maurice to the Val d'Isere ski station. Comparing conventional round rings with the asymmetric chainrings, they both rode over a minute quicker with O.Symetric’s Harmonic rings.
O.Symetric chainrings are available for Shimano, SRAM, FSA and all other cranks with a BCD of 130mm in the following configurations:
Road specific rings 42–52T
TT specific rings 44–54T
Compact rings 38–50T and 38–52T Colours Black or Silver
* NEW - 3mm thick specific TT ring - 52,54 or 56 - £130
The O.Symetric chainrings are available to buy now and are currently available from stock in the UK.
trainsharpcyclecoaching