Patent ID: 7462120

Claim:
A chain ring gear set adapted for attaching to spider arms, the spider arms disposed along a vertical axis, the spider arms attached to and extending outwardly from a bicycle gear crank, the bicycle gear crank disposed along a horizontal axis, the ring gear set is adapted for receiving a bicycle chain thereon, the chain transferred on the ring gear set using a chain derailleur, the ring gear set comprising: a first ring gear adapted for attachment to the spider arms, a radially outermost perimeter of said first ring gear having a first warped portion; and a second ring gear adapted for attachment to the spider arms, said second ring gear disposed in a spaced relationship to said first ring gear, said first warped portion of the radially outermost perimeter of said first ring gear extending parabolically toward a radial outermost perimeter of said second ring gear and at an angle to the vertical axis; whereby the first warped portion of the perimeter of said first ring gear reducing a horizontal distance periodically between the perimeter of said first ring gear and the perimeter of said second ring gear.