Osymetric Chainring Shimano/SRAM 130mm BCD


Item # OSY0005

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  • Black, 130x42 ($159.95)
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Item # OSY0005

More speed for less effort.

If you watched so much as one stage of one Grand Tour this year, you saw some of the riders occupying the top spots riding the Osymetric Chainrings. But, if you're like most people, you were scratching your head every time the camera panned to the drivetrains. Not quite an oval, and certainly not an ellipse, the Osymetric Chainring is its own shape — and we're happy for that. Oysmetric delivers greater efficiency, increased power, and requires less user effort than standard round rings.

Now, before we get into explaining the Osymetric, we want you to abandon any preconceptions or memory comparisons of failed experiments like Biopace. This isn't to say that those engineers were wrong to pursue these designs, they simply never perfected the technology. We think that this is due to a fear of breaking free from the parameters and presets of what cycling componentry is supposed to look like. However, Osyemtric has realized that the best look for a bike is crossing over the finish line in first place. That's why Osymetric isn't afraid to appear obtuse in its aesthetic.

The concept behind Osymetric is relatively easy to grasp. On a standard chainring, power isn't applied equally throughout a revolution of the crankarm. For simplicity's sake, let's divide a revolution into four quadrants. We'll call twelve and six o'clock Top Dead Center (TDC) and Bottom Dead Center (BDC), respectively. The horizontal position of three o'clock can be called just that. It is within the angle between the horizontal position and BDC, that power is most predominately exerted. However, the acute radii between the horizontal position and TDC and BDC are relative dead spots for power. Osymetric's shape directly reflects this data. It works on the objective of minimizing the time spent in dead spots, while maximizing the time spent within the radii of efficient power exertion -- horizontal. Basically, this means that, as the operator, you can apply more force while spending less energy. In fact, Osymetric's design minimizes torque and effort by creating a nearly constant angular velocity. This means that while your gear inches are maximized and extended in the power position, the ring changes shape at the dead spot to speed you back to the power position.

Osymetric's testing has shown that its Twincam shaped rings provide an average of 10% increase in watts per revolution. Also, with the near elimination of 'rest' in dead spots, Osymetric claims an average of 12% reduction in lactic acid buildup. And despite the Twincam shape, Osymetric does not require a special chain. Osymetric acknowledges that it takes around one hour for 95% of users to 'get used to it.' So, we suggest resigning your final judgement till your muscle memory adjusts.

The Osymetric Chainring Shimano/SRAM 130mm BCD is available in the color Black and in 42, 44, 52, 54, and 56 tooth options. Please note that this is designed for Shimano and SRAM cranksets with 130mm BCDs. We are also offering the Osymetric in a compact, 110mm BCD chainring size.

Tech Specs

Number of Rings:
42 - 56 t
Bolt Circle Diameter:
130 mm
Compatible Components:
Shimano and SRAM cranksets with 130mm BCDs
Recommended Use:
road cycling and racing
Manufacturer Warranty:

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