Osymetric O-14 5-Arm Chainring 130mm BCD $164.50
Power to the pedals.
One of the key ways to maximize power to the drivetrain is to learn to pedal efficiently, or to not pedal in "squares." The most powerful pedal strokes have equal pressure applied to the pedals throughout the entire 360 degrees. Osymetric recognized that the perfect pedal stroke is difficult for even the most skilled professional to perform, so its dual cam chainrings were designed to address the deficiencies in pedal stroke.
The first thing you'll notice about the chainring is that it has an odd shape. The Osymetric chainring is the brainchild of French engineer Jean-Louis Talo. The chainrings use a dual-cam design, with each cam lobe corresponding to the most powerful part of the pedal stroke: the downstroke. This gives it the unmistakable square/oblong shape. The design increases the gear inches of the chainring at the point where you’re able to apply the most force, but as you transition to your least powerful part of the stroke, or dead spot, the chainring reduces in size to speed you back into the power part of the stroke. This is different from an ovalized chainring that merely adds two teeth to maximize stroke in the power phase. An Osymetric 52-tooth chainring would be similar to a 55-tooth in the largest portion of the cam, then gradually reducing to a 49-tooth over the dead spot.
To install the chainrings, you'll need to make adjustments to the derailleur height and width, with the included screw. And you'll also need to spend time fine tuning the rear derailleur. The first ride may seem a bit awkward, but after a few times out you'll feel more power in your stroke and be less aware of any inconsistencies in chainring shape.
The Osymetric O-14 5-Arm Chainring fits any crankset with a 130mm BCD. It is available in 42t, 44t, 52t, 54t, and 56t.