U.S. Patent No. 8,092,329
A long time in the works, this U.S. Patent “Bicycle Chain Rings with Ramps” covers elements of the shifting technology we at Synthesis are working on for several years. The patent was finally awarded Jan, 2012 after several years in incubation.
This is one of several patents on the technology behind the World’s Fastest Shifting Chainrings. Originally known as Radical Ramp technology, you can see the WickWerks Web Site to see how it works. The new name is BRIDGE Shift Technology.
If by some chance you think the technology is not for real, look who’s using it. Some of the fastest riders around — particularly in Cyclocross — where these rings adorn many a bike ridden to World Cup and World Championship podiums. Moreover, it’s our belief that if others had adopted this technology, the 1X craze would never have started — there would be no reason since with this technology the front shifting is quick, exact, and pleasurable.
Bicycle chainrings with this technology are available for sale at your local bike shop, or at WickWerks.com. If you ‘re a cyclist, you owe it to yourself to see what you’re missing.
Follow on patents include U.S. Patent No. 8,617,015 covering more parts and variations of the shift technology.
How It Works
As shown in the U.S. Patent image, the special design of shift ramps are key to shifting improvements. The old technology lifts a bicycle chain using contact at the narrow portion of a chain link. (Lifting between the chain link pivot points.) The new technology of this U.S. Patent shows how the chain is lifted under the chain link pivot points.
The pivoting points of the chain are also the widest portions of the chain. These are the “Load Points” in the chain, because all the chain force goes through each and every pivot point. By lifting under these pivoting points control of the chain is much more stable during a shift. This makes it less likely to grind or miss the shift.
Secondly, by having a lot of shift ramps around the face of the chainring, the shifts become almost instant. Basically, it shifts when the rider “says” shift.
Those 2 things are the key inventive elements shown in the patent. Though there are a lot of other important details, too.