Welcome on ovalchainrings.com!
Here you’ll find everything about the oval chainrings that are available, also concepts that never came in the market, records with oval chainrings etc.
The Oval chainrings wore invented in 1890, but the first well-known brand brought a model out in the 90’s. The older generation of cyclers might remember the Biopace system of Shimano. In the meantime made Rotor his name with the oval blades named Q-rings. Carlos Sastre did win the Tour de France with the Rotor Q-rings in 2008 and in 2012 Ryder Hesjedal won the Giro d’Italia tanks to the Rotor Q-rings. In the same year that Ryder won the Giro the brand O.symetric made his name; great tanks to Bradley Wiggins and Chris Froome who put down a great achievement in both the Tour de France and the Olympic games. They used O.symetric for quit a while before all the publicity but these two event made them great. The multiple Tour de France winner, Bernard Hinault, went for a third brand, in the concept of oval chainrings, named Ogival. He didn’t use it in the time but is working together with the producer of Ogival. Ogival does have a real winner riding with this ring, that is Maas van Beek who improved the world record with this brand.
The theorie that the creators of the ovalchainring used is that you can give most power when the crank is horizontal. That fact is combined with the fact that you don't have to give that much power when the crank is vertical. The combination of these two facts leads to the oval chainring, a ring that is big (for the big amount of power) and small ( for the small amount of power) at the same time. This sound weird but the next picture makes it a bit clearer:
These ovalchainrings are currently available: