In a saddle riding vehicle including: a swing arm that supports a rear wheel; a sprocket disposed at the rear wheel; and a chain that meshes with the sprocket to thereby drive the rear wheel, the rear wheel includes a rear wheel-side protruding portion that protrudes from the sprocket to an outside in a vehicle width direction, a chain cover fastening portion, to which a chain cover for covering the chain is fastened, is disposed on the outside in the vehicle width direction with respect to the rear wheel-side protruding portion and protrudes to an inside in the vehicle width direction, and the chain cover fastening portion is disposed at a position at which the chain cover fastening portion overlaps the rear wheel-side protruding portion in a vehicle side view.

In a saddle riding vehicle including: a swing arm that supports a rear wheel; a sprocket disposed at the rear wheel; and a chain that meshes with the sprocket to thereby drive the rear wheel, the rear wheel includes a rear wheel-side protruding portion that protrudes from the sprocket to an outside in a vehicle width direction, a chain cover fastening portion, to which a chain cover for covering the chain is fastened, is disposed on the outside in the vehicle width direction with respect to the rear wheel-side protruding portion and protrudes to an inside in the vehicle width direction, and the chain cover fastening portion is disposed at a position at which the chain cover fastening portion overlaps the rear wheel-side protruding portion in a vehicle side view.

A cover member configured to cover a drive-power transmission member is fixed to a swing arm with a simple structure. A saddle-ride type vehicle includes a swing arm swingable up and down, a rear wheel supported at a rear end portion of the swing arm, an endless drive-power transmission member extending along the swing arm in a front-rear direction and configured to transmit drive power of a power unit to the rear wheel, a cover member fixed to the swing arm and covering the drive-power transmission member, and a slider provided on an upper face of the swing arm and configured to receive the drive-power transmission member. The cover member includes a fastening portion that is fastened to the swing arm by a fastener and an engagement portion that engages with the slider.

A cover member configured to cover a drive-power transmission member is fixed to a swing arm with a simple structure. A saddle-ride type vehicle includes a swing arm swingable up and down, a rear wheel supported at a rear end portion of the swing arm, an endless drive-power transmission member extending along the swing arm in a front-rear direction and configured to transmit drive power of a power unit to the rear wheel, a cover member fixed to the swing arm and covering the drive-power transmission member, and a slider provided on an upper face of the swing arm and configured to receive the drive-power transmission member. The cover member includes a fastening portion that is fastened to the swing arm by a fastener and an engagement portion that engages with the slider.

A track racing bicycle having a head tube and/or down tube with asymmetrical left and right sides. A left side of the head tube and/or down tube may be closer to a central plane of a frame of the track racing bicycle for aerodynamic purposes. Moreover, the drivetrain may be disposed on the left side of the frame instead of the right side. Also, a rear wheel of the track racing bicycle may have a mechanism for mitigating or prohibiting forward slip of the rear wheel in the rear dropouts.

A track racing bicycle having a head tube and/or down tube with asymmetrical left and right sides. A left side of the head tube and/or down tube may be closer to a central plane of a frame of the track racing bicycle for aerodynamic purposes. Moreover, the drivetrain may be disposed on the left side of the frame instead of the right side. Also, a rear wheel of the track racing bicycle may have a mechanism for mitigating or prohibiting forward slip of the rear wheel in the rear dropouts.

A snowmobile tunnel stop protection system to provide protection to a tunnel from a studded endless track used on a snowmobile. The tunnel includes at least one slot formed into an undersurface of the tunnel. At least one protection rail extends from a first end to a second end and includes a plurality of holes passing through the protection rail. A plurality of fasteners are used to attach the protection rail to the tunnel where each fastener has a first fastener portion that passes through the at least one slot. Each fastener includes the first fastener portion that passes through one of the plurality of holes and a second fastener portion that couples to the corresponding first fastener portion to couple the protection rail to the slot formed in the tunnel.

A snowmobile tunnel stop protection system to provide protection to a tunnel from a studded endless track used on a snowmobile. The tunnel includes at least one slot formed into an undersurface of the tunnel. At least one protection rail extends from a first end to a second end and includes a plurality of holes passing through the protection rail. A plurality of fasteners are used to attach the protection rail to the tunnel where each fastener has a first fastener portion that passes through the at least one slot. Each fastener includes the first fastener portion that passes through one of the plurality of holes and a second fastener portion that couples to the corresponding first fastener portion to couple the protection rail to the slot formed in the tunnel.

A belt housing assembly includes a first shaft with a first bearing that is mounted in a fixed bearing retainer and a second shaft with a second bearing mounted in a rotatable eccentric bearing retainer. A center of the second bearing is offset from a center of the eccentric bearing retainer. A distance between the first shaft and the second shaft is adjustable by rotating the eccentric bearing retainer. A method of adjusting a distance between a first sprocket attached to a first shaft of a drivetrain operatively interconnecting an engine to a ground engagement member of an all-terrain vehicle via a drive belt interconnected with a second sprocket attached to a second shaft of the drivetrain is also provided.

A snowmobile tunnel stop protection system to provide protection to a tunnel from a studded endless track used on a snowmobile. The tunnel includes at least one slot formed into an undersurface of the tunnel. At least one protection rail extends from a first end to a second end and includes a plurality of holes passing through the protection rail. A plurality of fasteners are used to attach the protection rail to the tunnel where each fastener has a first fastener portion that passes through the at least one slot. Each fastener includes the first fastener portion that passes through one of the plurality of holes and a second fastener portion that couples to the corresponding first fastener portion to couple the protection rail to the slot formed in the tunnel.