How do Osymetric chainrings work

A chainring adjusted to the bio mechanical possibilities and restrictions of the human cycling movement. That was the thought during the development of Osymetric chainrings. So “How do Osymetric chainrings work?” That brings us almost automatically to the dead spot in the pedal movement. The 6 o’ clock and 12 o’ clock position of the crank is the place where pushing hard makes no sense. But on the other side: Not pushing at all also doesn’t make any sense because in that case you won’t move forward. Sounds silly right? True, but this is just to illustrate that there are forces in the dead spot otherwise the chainring won’t spin and the bike won’t move, simple.

I’d like to push trough the dead spot with as little effort as possible. Oh, and by the way: When I am able to push really hard (3 o’clock position) give me some extra power please!

The frenchmen Jean-Louis Talo must have heard this non pronounced wish of every cyclist almost literally while he and the italian Sassini were working together on their revolutionary chainring. The principle is so simple that is cost Talo only 12 days to work the concept out to a usable product in real world.

They mounted the chainring on a road bike and went into the hills at the French Riviera and they felt that their idea worked. When several tests were done in a sports lab to determine the performance enhancing effect scientifically, Prince Albert of Monaco made the Monaco sports science lab available for this innovative project.

Testing in the lab showed that the design was technically perfect. Nevertheless, they tried various other forms but they did not work.

Why did Osymetric worked so well?

We will try to explain this here later. We have to put more words on this page to make it clear for you and me