A bicycle includes a chainstay protector having an upper surface including a valley, a first peak, and a second peak. The first peak extends upwardly from the valley toward the chain and has a first contact surface positioned to contact the chain a first height above the valley. The second peak extends upwardly from the valley toward the chain and has a second contact surface positioned to contact the chain a second height above the valley. The first contact surface is spaced from the second contact surface by a gap that is at least 5 times the first height. Each of the first and second contact surfaces has a length that is less than the length of the gap and less than two times a pitch of the chain.

A bicycle includes a frame, a motor, a battery, a key interface, a crank set, and a shell. The frame defines a cavity and an opening providing access to the cavity. The motor is coupled to frame beneath the cavity. The battery extends at least partially into the frame. The battery is configured to power the motor. The key interface is positioned along an exterior of the frame. Turning a key in the key interface releases the battery to facilitate removing the battery from the frame. The crank set is coupled to the motor. The crank set includes crank arms. The shell extends at least partially over the opening.

A bicycle includes a frame, a motor, a battery, a key interface, a crank set, and a shell. The frame defines a cavity and an opening providing access to the cavity. The motor is coupled to frame beneath the cavity. The battery extends at least partially into the frame. The battery is configured to power the motor. The key interface is positioned along an exterior of the frame. Turning a key in the key interface releases the battery to facilitate removing the battery from the frame. The crank set is coupled to the motor. The crank set includes crank arms. The shell extends at least partially over the opening.

A bicycle includes a frame, a cover, a door, a first key interface, and a second key interface. The frame defines a cavity, a first opening providing access to the cavity, an interior compartment, and a second opening providing access to the interior compartment. The cover extends across the first opening. The door extends across the second opening. The first key interface is positioned along the frame proximate the first opening. Turning a key in the first key interface releases at least a portion of the cover from the frame. The second key interface is positioned along the frame proximate the second opening. Turning a key in the second key interface releases at least a portion of the door from the frame.

A bicycle includes a frame, a cover, a door, a first key interface, and a second key interface. The frame defines a cavity, a first opening providing access to the cavity, an interior compartment, and a second opening providing access to the interior compartment. The cover extends across the first opening. The door extends across the second opening. The first key interface is positioned along the frame proximate the first opening. Turning a key in the first key interface releases at least a portion of the cover from the frame. The second key interface is positioned along the frame proximate the second opening. Turning a key in the second key interface releases at least a portion of the door from the frame.

A bicycle includes a frame, a storage compartment, a battery pack, a pedal assist unit, and a lighting system. The frame includes a head tube, a stem, a down tube, a central hub, and a pair of chain stays. The central hub defines an internal cavity. The down tube and the central hub cooperatively define a battery opening connected to the internal cavity. The storage compartment includes a door positioned to selectively enclose an opening in the down tube. The battery pack is releasably received by the battery opening. The pedal assist unit is disposed within the internal cavity. The lighting system includes one or more taillights integrated into the chain stays, a conspicuity lamp integrated into the head tube, and/or a headlight integrated into to at least one of the stem or the head tube.

A bicycle includes a frame, a storage compartment, a battery pack, a pedal assist unit, and a lighting system. The frame includes a head tube, a stem, a down tube, a central hub, and a pair of chain stays. The central hub defines an internal cavity. The down tube and the central hub cooperatively define a battery opening connected to the internal cavity. The storage compartment includes a door positioned to selectively enclose an opening in the down tube. The battery pack is releasably received by the battery opening. The pedal assist unit is disposed within the internal cavity. The lighting system includes one or more taillights integrated into the chain stays, a conspicuity lamp integrated into the head tube, and/or a headlight integrated into to at least one of the stem or the head tube.

A bicycle includes a frame, a motor, a battery, a key interface, a crank set, and a shell. The frame defines a cavity and an opening providing access to the cavity. The motor is coupled to frame beneath the cavity. The battery extends at least partially into the frame. The battery is configured to power the motor. The key interface is positioned along an exterior of the frame. Turning a key in the key interface releases the battery to facilitate removing the battery from the frame. The crank set is coupled to the motor. The crank set includes crank arms. The shell extends at least partially over the opening.

A bicycle includes a frame, a motor, a battery, a key interface, a crank set, and a shell. The frame defines a cavity and an opening providing access to the cavity. The motor is coupled to frame beneath the cavity. The battery extends at least partially into the frame. The battery is configured to power the motor. The key interface is positioned along an exterior of the frame. Turning a key in the key interface releases the battery to facilitate removing the battery from the frame. The crank set is coupled to the motor. The crank set includes crank arms. The shell extends at least partially over the opening.

The invention relates to a propulsion system (1) for a pedal vehicle. The propulsion system (1) comprises a power unit (1) allowing the power originating from a bottom-bracket axle (2) to be combined with the power from two motors (40, 50), a first deformable transmission element (23) allowing the transmission of power to the rear wheel (73) and a casing assembly (19) enclosing particularly the first deformable transmission element (23) and the power unit (1), with the exception of part of the bottom-bracket axle (2).