Alternating tooth chain ring

1. A chain ring, comprising:

a plurality of teeth, each tooth having an end face having a centerpoint,

wherein centerpoints of at least four adjacent teeth form a substantially undulating pattern that is substantially regular around a circumference of the ring;

wherein at least a portion of the end face of each tooth laterally overlaps the lateral position of each adjacent tooth; and

wherein each of the plurality of teeth has a thickness and the thickness of each of the plurality of teeth at its respective thickest point is substantially identical.

2. The chain ring according to claim 1 , wherein the chain ring is configured to be secured to a bicycle adjacent at least a second chain ring.

3. The chain ring according to claim 2 , wherein the plurality of teeth is configured to allow the drive chain to shift between a position engaged with the plurality of teeth and a position disengaged from the plurality of teeth and engaged with the second ring.

4. The chain ring according to claim 1 , wherein the substantially undulating pattern is substantially a triangle wave.

5. The chain ring according to claim 1 , wherein at least one centerpoint of at least one of the at least four teeth is positioned away from a peak or a valley of the substantially undulating pattern.

6. A drive system for a vehicle, comprising:

a drive chain having a plurality of inner links and a plurality of outer links, each link comprising an inner plate and an opposite outer plate, each inner plate having a first inner surface facing the outer plate and each outer plate having a second inner surface facing the inner plate; and

a chain ring having a plurality of teeth joined to one another and serially arranged;

wherein each of the plurality of teeth is configured to interfit with a respective one of the plurality of links of the drive chain;

wherein each of the plurality of teeth has a thickness, the thickness of each of the plurality of teeth at its respective thickest point being substantially identical;

wherein the plurality of teeth comprises a first set of teeth and a second set of teeth, wherein about half of the plurality of teeth comprises the first set of teeth and about half of the plurality of teeth comprises the second set of teeth;

wherein each of the plurality of teeth has a first outer surface and a first inner surface;

wherein each of the inner surface and the outer surface of each of the first set of teeth is permitted to contact a corresponding inner surface of one of the inner or outer plate of a respective chain link with which it interfits in operative position when the chain interfits without shifting between rings; and

wherein at least one portion of one of the first outer surface and the first inner surface of each of the second set of teeth remains spaced from only one of the first and second inner surfaces of the respective link with which each of the second set of teeth interfits in operative position when the chain interfits without shifting between rings.

7. The drive system for a vehicle according to claim 6 , wherein the at least one portion of the second set of teeth is spaced from the outer plate.

8. The drive system for a vehicle according to claim 6 , wherein the at least one portion of each of the second set of teeth is spaced from the inner plate.

9. The drive system for a vehicle according to claim 6 , wherein each of the second set of teeth is configured to contact only one of the inner plate and the outer plate.

10. The drive system for a vehicle according to claim 9 , wherein each of the second set of teeth is configured to contact the inner plate.

11. The drive system for a vehicle according to claim 9 , wherein each of the second set of teeth is configured to contact the outer plate.