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A system for converting a snowmobile into a wheeled vehicle is disclosed, and comprises a pair of wheel mounting assemblies for each being mounted on one of the front skid support assemblies of the snowmobile, and a swing arm for mounting on the snowmobile in a manner such that the swing arm is pivo

A system for converting a snowmobile into a wheeled vehicle is disclosed, and comprises a pair of wheel mounting assemblies for each being mounted on one of the front skid support assemblies of the snowmobile, and a swing arm for mounting on the snowmobile in a manner such that the swing arm is pivotable with respect to the frame. The swing arm has a forward end and a rearward end, and is mountable on the drive shaft such that the swing arm is pivotable with respect to the drive shaft. An axle is mounted on the swing arm toward the rearward end thereof, and a suspension mounting assembly is provided for mounting on the frame of the snowmobile and controlling pivot movement of the swing arm.

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I claim: 1. A system for converting a snowmobile into a wheeled vehicle, the snowmobile being of the types including a frame, a pair of front skid support assemblies mounted on the frame, and a rotating drive shaft mounted on the frame, the system comprising: a pair of wheel mounting assemblies for

I claim: 1. A system for converting a snowmobile into a wheeled vehicle, the snowmobile being of the types including a frame, a pair of front skid support assemblies mounted on the frame, and a rotating drive shaft mounted on the frame, the system comprising: a pair of wheel mounting assemblies for each being mounted on one of the front skid support assemblies of the snowmobile so that a first wheel is mountable on a first one of the front skid support assemblies and a second wheel is mountable on a second one of the front skid support assemblies; a swing arm for mounting on the snowmobile in a manner such that the swing arm is pivotable with respect to the frame, the swing arm being mountable on the drive shaft such that the swing arm is pivotable with respect to the drive shaft, the swing arm having a forward end and a rearward end; an axle mounted on the swing arm toward the rearward end thereof; and a suspension mounting assembly for mounting on the frame of the snowmobile and controlling pivot movement of the swing arm; wherein the forward end of the swing arm forms a forward sleeve for receiving a portion of the drive shaft, the rearward end of the swing arm forming an axle sleeve; wherein the swing arm comprises: a pair of lateral members extending between the ends of the swing arm; and a plurality of transverse members extending between the lateral members, a forward one of the transverse members forming the forward sleeve and a rearward one of the transverse members forming the axle sleeve. 2. The system of claim 1 wherein the suspension mounting assembly comprises: an upper frame mount structure for mounting on the frame at a spaced location from the drive shaft; a rocker member pivotally mounted on the swing arm at a location spaced from the forward end of the swing arm, the rocker member having a pair of opposite first and second ends; a pivot link connecting the upper frame mount structure to the rocker member towards the first end thereof; and a shock absorber linking the suspension mounting assembly and the upper frame mount structure, the shock absorber being mounted on the rocker member toward the second end thereof; wherein the rocker member is mounted on the swing arm at a location between the pivot link and the shock absorber. 3. The system of claim 2 wherein the upper frame mount structure comprises: a pair of spaced side mounts; and at least one connector member connecting the spaced side mounts together. 4. The system of claim 2 wherein the first end of the rocker member is positioned above the swing arm and the second end is positioned below the swing arm. 5. The system of claim 3 wherein the pivot link comprises: a first link member mounted to the at least one connector member of the upper frame mount structure, the first link member defining a passage receiving the at least one connector member; a second link member mounted to the rocker member, the second link defining a passage receiving a fastener mounted on the rocker member; and a pair of lateral link members connecting the first link member to the second link member. 6. The system of claim 1 wherein the axle extends through the axle sleeve; and additionally comprising: a driven sprocket mounted on the axle shaft; a chain for connecting the driven sprocket to a drive sprocket mounted on the drive shaft for transferring rotational motion between the drive sprocket and the driven sprocket; wherein a distance between the driven sprocket and the drive sprocket when the swing arm is mounted on the drive shaft is substantially constant as the swing arm is pivoted on the drive shaft. 7. The system of claim 1 wherein each of the wheel mounting assemblies comprises: an outboard suspension mount for mounting to outboard ends of upper and lower arm structures of the front skid support assemblies; a shock mount structure for mounting to a shock absorber of the front skid support assembly, the shock mount being mounted on the outboard suspension mount; an upper pivot structure mounted on an upper mount portion of the outboard suspension mount; a lower pivot structure mounted on a lower mount portion of the outboard suspension mount; and an outer wheel mount structure mounted on the upper and lower pivot structures. 8. The system of claim 7 wherein the outer wheel mount structure includes: a wheel mount member attached to each of the upper and lower pivot structures; a stub axle rotationally mounted on the wheel mount member; a brake disc mounted on the stub axle; a brake caliper attached to the wheel mount member for acting on the brake disc; and a stud support member mounted on the stub axle to rotate with the stub axle. 9. A snowmobile converted to a wheeled vehicle, comprising: a snowmobile including a frame, a pair of front skid support assemblies mounted on the frame, and a rotating drive shaft mounted on the frame; a pair of wheel mounting assemblies each mounted on one of the front skid support assemblies of the snowmobile and configured so that a first wheel is mountable on a first one of the front skid support assemblies and a second wheel is mountable on a second one of the front skid support assemblies; a swing arm mounted on the drive shaft of the snowmobile in a manner such that the swing arm is pivotable with respect to the drive shaft, the swing arm having a forward end and a rearward end; an axle mounted on the swing arm toward the rearward end thereof; and a suspension mounting assembly mounted on the frame of the snowmobile, the suspension mounting assembly controlling pivot movement of the swing arm; wherein the forward end of the swing arm forms a forward sleeve for receiving a portion of the drive shaft, the rearward end of the swing arm forming an axle sleeve; wherein the swing arm comprises: a pair of lateral members extending between the ends of the swing arm; and a plurality of transverse members extending between the lateral members, a forward one of the transverse members forming the forward sleeve and a rearward one of the transverse members forming the axle sleeve. 10. The system of claim 9 wherein the suspension mounting assembly comprises: an upper frame mount structure mounted on the frame at a spaced location from the drive shaft; a rocker member pivotally mounted on the swing arm at a location spaced from the forward end of the swing arm, the rocker member having a pair of opposite first and second ends; a pivot link connecting the upper frame mount structure to the rocker member towards the first end thereof; and a shock absorber linking the suspension mounting assembly and the upper frame mount structure, the shock absorber being mounted on the rocker member toward the second end thereof; wherein the rocker member is mounted on the swing arm at a location between the pivot link and the shock absorber. 11. The system of claim 10 wherein the upper frame mount structure comprises: a pair of spaced side mounts; and at least one connector member connecting the spaced side mounts together. 12. The system of claim 10 wherein the first end of the rocker member is positioned above the swing arm and the second end is positioned below the swing arm. 13. The system of claim 11 wherein the pivot link comprises: a first link member mounted to the at least one connector member of the upper frame mount structure, the first link member defining a passage receiving the at least one connector member; a second link member mounted to the rocker member, the second link defining a passage receiving a fastener mounted on the rocker member; and a pair of lateral link members connecting the first link member to the second link member. 14. The system of claim 1 wherein the axle extends through the axle sleeve; and additionally comprising: a drive sprocket mounted on the drive shaft of the snowmobile; a driven sprocket mounted on the axle shaft; a chain connecting the driven sprocket to the drive sprocket for transferring rotational motion between the drive sprocket and the driven sprocket; wherein a distance between the driven sprocket and the drive sprocket when the swing arm is mounted on the drive shaft is substantially constant as the swing arm is pivoted on the drive shaft. 15. The system of claim 9 wherein each of the wheel mounting assemblies comprises: an outboard suspension mounted on outboard ends of upper and lower arm structures of the front skid support assemblies; a shock mount structure mounted to a shock absorber of the front skid support assembly, the shock mount being mounted on the outboard suspension mount; an upper pivot structure mounted on an upper mount portion of the outboard suspension mount; a lower pivot structure mounted on a lower mount portion of the outboard suspension mount; and an outer wheel mount structure mounted on the upper and lower pivot structures. 16. The system of claim 15 wherein the outer wheel mount structure includes: a wheel mount member attached to each of the upper and lower pivot structures; a stub axle rotationally mounted on the wheel mount member; a brake disc mounted on the stub axle; a brake caliper attached to the wheel mount member for acting on the brake disc; and a stud support member mounted on the stub axle to rotate with the stub axle. 17. A system for converting a snowmobile into a wheeled vehicle, the snowmobile being of the types including a frame, a pair of front skid support assemblies mounted on the frame, and a rotating drive shaft mounted on the frame, the system comprising: a pair of wheel mounting assemblies for each being mounted on one of the front skid support assemblies of the snowmobile so that a first wheel is mountable on a first one of the front skid support assemblies and a second wheel is mountable on a second one of the front skid support assemblies; a swing arm for mounting on the snowmobile in a manner such that the swing arm is pivotable with respect to the frame, the swing arm being mountable on the drive shaft such that the swing arm is pivotable with respect to the drive shaft, the swing arm having a forward end and a rearward end; an axle mounted on the swing arm toward the rearward end thereof; and a suspension mounting assembly for mounting on the frame of the snowmobile and controlling pivot movement of the swing arm; wherein the suspension mounting assembly comprises: an upper frame mount structure for mounting on the frame at a spaced location from the drive shaft; a rocker member pivotally mounted on the swing arm at a location spaced from the forward end of the swing arm, the rocker member having a pair of opposite first and second ends; a pivot link connecting the upper frame mount structure to the rocker member towards the first end thereof; and a shock absorber linking the suspension mounting assembly and the upper frame mount structure, the shock absorber being mounted on the rocker member toward the second end thereof; wherein the rocker member is mounted on the swing arm at a location between the pivot link and the shock absorber; wherein the upper frame mount structure comprises: a pair of spaced side mounts; and at least one connector member connecting the spaced side mounts together; wherein the pivot link comprises: a first link member mounted to the at least one connector member of the upper frame mount structure, the first link member defining a passage receiving the at least one connector member; a second link member mounted to the rocker member, the second link defining a passage receiving a fastener mounted on the rocker member; and a pair of lateral link members connecting the first link member to the second link member.