Elliptical chainrings are a type of bicycle chainring that are designed to vary the amount of pedaling resistance throughout the pedal stroke. Traditional chainrings are round, meaning that the resistance to pedaling force is constant throughout the pedal stroke.
Elliptical chainrings, on the other hand, are non-circular in shape, typically resembling an oval. This shape is designed to create more resistance during the portions of the pedal stroke where the rider's legs are strongest (i.e. the downstroke) and less resistance during the portions of the stroke where the legs are weakest (i.e. the upstroke).
Advocates of elliptical chainrings claim that they offer a number of benefits, including:
It's worth noting that not all cyclists will benefit from elliptical chainrings, and some riders may find that they prefer the feel of traditional round chainrings. Ultimately, the best chainring shape for a given rider will depend on a number of factors, including their riding style, fitness level, and personal preferences.
All chainrings types you can find here.
Chainrings by specific crank type: SRAM, SRAM 94BCD, Race Face, 104BCD, 96BCD, Shimano direct, Cannondale & FSA chainrings, Bosh CX chainrings, e*thirteen direct, Middleburn direct, Elliptic, Hyperglide+ compatible chainrings
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