O.Symetric Shimano Dura Ace 9000 BCD 110mm

O.Symetric Shimano Dura Ace 9000 BCD 110mm

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A Termék ára: 188 €
The "O.Symetric philosophy", the biomechanical concept:

It has been studied so that the radius of the plateau varies in proportion to the force produced by the leg of the TDC to bottom dead center.
Indeed: to dead leg is 2 times lower than when the crank is horizontal, which implies a slower angular velocity at top dead center which produced a choking muscles, including triceps because torque resistant too strong for the leg, not a recovery zone as it is commonly admitted.

The aim of the plate geometry has been to facilitate the work where the leg is low (top dead center and bottom dead implying a small radius) and provide jobs where the leg is strong (crank around horizontally which implies a large radius.

In summary, where the leg is small radius is low, where the leg is strong radius is high among both the radius increases proportionally to the strength of the leg which can never be the case or with an oval and either with an elliptical (preload curve as symmetrical lines perpendicular to 2).

Specifically O.Symetric trails of 54 teeth at top dead center and bottom dead center, its radius is equal to the resistance of a plateau of 50 teeth round.
Between the 2 points death grows proportionally to the strength of the leg to reach a radius of 58 teeth around the crank horizontal and declining thereafter again be equal to a plateau of 50 teeth at bottom dead center, the gear is obviously equivalent to a round tray of 54 teeth. Thus a plateau of variable geometry that behaves like a 3rd derail either according to the gradient but the strength of the leg. 
Product Name: O.Symetric Road Kit R Chainring Set 110mm for Shimano Dura Ace 9000 - black
Manufacturer: O.Symetric
Item Code: OYM171650
Material: 7075 T6 aluminum
Weight: approx. 150 gram (per set 38-50)
approx. 155 gram (per set 38-52)
approx. 40 gram (38 teeth)
approx. 110 gram (50 teeth)
approx. 115 gram (52 teeth)
Chainwheel, number of teeth: 38-50 or 38-52
Fitting for derailleur: Shimano Dura Ace 9000 - 11-speed
Bolt Circle (mm): 110
Color: black
Included in delivery: chainring set incl. chain catcher and mounting material