A vehicle with a traction mechanism unit, a method for assembling a vehicle, a method for avoiding pedal kickback in a vehicle, a method for transmitting a drive torque of a single-track or multi-track vehicle via a traction mechanism unit, and a method for eliminating interaction between a drive train with a traction mechanism unit and a suspension/damping device in a single-track or multi-track vehicle, and a corresponding traction mechanism unit.

A vehicle with a traction mechanism unit, a method for assembling a vehicle, a method for avoiding pedal kickback in a vehicle, a method for transmitting a drive torque of a single-track or multi-track vehicle via a traction mechanism unit, and a method for eliminating interaction between a drive train with a traction mechanism unit and a suspension/damping device in a single-track or multi-track vehicle, and a corresponding traction mechanism unit.

The disclosed embodiments include a drive structure. The drive structure includes a first sprocket and a second sprocket. Each of the first and second sprocket has a shape with two points and four sections of teeth where two sections of teeth are inline and two sections are curved. Attached to the first sprocket are slap crank arms, which contains a slap crank arm lever to move and cause an impact force when the first sprocket is rotated. A drive chain travels in a loop between the first sprocket and second sprocket. Embodiments of the drive structure include other elements of a bicycle frame and rear derailleur structure.

The disclosed embodiments include a drive structure. The drive structure includes a first sprocket and a second sprocket. Each of the first and second sprocket has a shape with two points and four sections of teeth where two sections of teeth are inline and two sections are curved. Attached to the first sprocket are slap crank arms, which contains a slap crank arm lever to move and cause an impact force when the first sprocket is rotated. A drive chain travels in a loop between the first sprocket and second sprocket. Embodiments of the drive structure include other elements of a bicycle frame and rear derailleur structure.

A conversion bicycle apparatus includes a chassis. The chassis includes a main tube. The chassis additionally includes a head tube. The chassis additionally includes a seat tube. The chassis additionally includes a rear fork. The rear fork includes a first fork arm and a second fork arm. The chassis additionally includes an attachment receiver. The attachment receiver is located proximate to a junction of at least the main tube and the rear fork. An attachment assembly is reversibly couplable to the attachment receiver via one or more protrusions and one or more corresponding apertures. The attachment assembly is additionally reversibly couplable to the attachment receiver via one or more fasteners.

A conversion bicycle apparatus includes a chassis. The chassis includes a main tube. The chassis additionally includes a head tube. The chassis additionally includes a seat tube. The chassis additionally includes a rear fork. The rear fork includes a first fork arm and a second fork arm. The chassis additionally includes an attachment receiver. The attachment receiver is located proximate to a junction of at least the main tube and the rear fork. An attachment assembly is reversibly couplable to the attachment receiver via one or more protrusions and one or more corresponding apertures. The attachment assembly is additionally reversibly couplable to the attachment receiver via one or more fasteners.

A protective cover for a drive chain of a bicycle includes a plurality of protective elements. The plurality of protective elements encompass the drive chain of the bicycle. The protective elements are movable together with the drive chain. At least one stationary cover element also is provided, which covers a gap between a sprocket of the bicycle and the bicycle drive chain. The bicycle drive chain is protected and risk of injury at the gap is reduced by the protective cover.

A protective cover for a drive chain of a bicycle includes a plurality of protective elements. The plurality of protective elements encompass the drive chain of the bicycle. The protective elements are movable together with the drive chain. At least one stationary cover element also is provided, which covers a gap between a sprocket of the bicycle and the bicycle drive chain. The bicycle drive chain is protected and risk of injury at the gap is reduced by the protective cover.