A retrofit electric drive apparatus is provided for converting a fossil fuel fitted motorcycle into an electric-powered motorcycle. In an embodiment, the apparatus includes a housing supporting electric drive train components. At least a portion of the housing is shaped to congruously match a portion of the motorcycle frame and reside within an envelope defined by the motorcycle frame.

In another embodiment, the retrofit electric drive apparatus comprises a housing including a first side element and a second side element, the first side element connected to the second side element at a predetermined spacing to create an internal space. The housing is shaped to reside within an envelope defined by the motorcycle frame and has at least a portion congruous with a portion of the motorcycle frame defining the envelope.

In another embodiment, the retrofit electric drive apparatus comprises a housing kit.

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first tooth has a first radial-tooth height. The at least one first tooth has a first chain-engaging axial width which is smaller than a first distance defined between opposed outer link plates of a bicycle chain and which is larger than a second distance defined between opposed inner link plates of the bicycle chain. The at least one second tooth is adjacent to the first tooth and is disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth is configured to engage with inner link plates of the bicycle chain. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height.

A bicycle sprocket comprises sprocket teeth. The sprocket teeth include at least one first tooth and at least one second tooth. The at least one first tooth has a first radial-tooth height. The at least one first tooth has a first chain-engaging axial width which is smaller than a first distance defined between opposed outer link plates of a bicycle chain and which is larger than a second distance defined between opposed inner link plates of the bicycle chain. The at least one second tooth is adjacent to the first tooth and is disposed on a downstream side in a rotational driving direction of the bicycle sprocket. The at least one second tooth is configured to engage with inner link plates of the bicycle chain. The at least one second tooth has a second radial-tooth height. The first radial-tooth height is greater than the second radial-tooth height.

Two-wheeled motor-driven vehicles are disclosed. In one embodiment, a two-wheeled motor-driven vehicle includes a chassis, a central unit including a drive unit and a seat carrier, and a cockpit including a steering mechanism and an operating unit. Front and/or rear wheels are carried on respective wheel mounts that rotatably carry the wheels via a roller bearing. The wheel mounts have a first toroidal wheel bearing rim and a second toroidal wheel bearing rim mountable to a wheel rim.

Two-wheeled motor-driven vehicles are disclosed. In one embodiment, a two-wheeled motor-driven vehicle includes a chassis, a central unit including a drive unit and a seat carrier, and a cockpit including a steering mechanism and an operating unit. Front and/or rear wheels are carried on respective wheel mounts that rotatably carry the wheels via a roller bearing. The wheel mounts have a first toroidal wheel bearing rim and a second toroidal wheel bearing rim mountable to a wheel rim.

A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and at least one chain-supporting portion. The plurality of sprocket teeth includes at least one first tooth and at least one second tooth. The at least one chain-supporting portion is arranged on the sprocket body to face the bicycle chain in an axial direction parallel to a rotational center axis of the bicycle sprocket without being received within an outer link space and an inner link space in a state where the plurality of sprocket teeth engages with a bicycle chain. The at least one chain-supporting portion is spaced apart from at least one of at least one first tooth and the at least one second tooth in the axial direction.

A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and at least one chain-supporting portion. The plurality of sprocket teeth includes at least one first tooth and at least one second tooth. The at least one chain-supporting portion is arranged on the sprocket body to face the bicycle chain in an axial direction parallel to a rotational center axis of the bicycle sprocket without being received within an outer link space and an inner link space in a state where the plurality of sprocket teeth engages with a bicycle chain. The at least one chain-supporting portion is spaced apart from at least one of at least one first tooth and the at least one second tooth in the axial direction.

The present invention relates to a suspension system for bicycles or other similar vehicles, said suspension system comprising a main triangle (1) or frame connected at one end to a front wheel (6) and connected at the other end to a damper (2) and a swinging element (3) serving as support means of a rear wheel (7); and wherein it incorporates a lower connecting element (5) comprising a first connecting shaft or point (5a) connected to the main triangle (1) and a connecting shaft or point (5b) connected to the swinging element (3), and where said system incorporates an upper connecting element (4) where there is located the first connecting shaft or point (4a) connected to the main triangle (1) and another second connecting shaft or point (4b) connected to the swinging element (3) and the damper (2).

The present invention relates to a suspension system for bicycles or other similar vehicles, said suspension system comprising a main triangle (1) or frame connected at one end to a front wheel (6) and connected at the other end to a damper (2) and a swinging element (3) serving as support means of a rear wheel (7); and wherein it incorporates a lower connecting element (5) comprising a first connecting shaft or point (5a) connected to the main triangle (1) and a connecting shaft or point (5b) connected to the swinging element (3), and where said system incorporates an upper connecting element (4) where there is located the first connecting shaft or point (4a) connected to the main triangle (1) and another second connecting shaft or point (4b) connected to the swinging element (3) and the damper (2).

Provided is a tricycle including: a tricycle body having a first frame pivoted to a second frame, the first frame having a crank, at least one wheel shaft being rotatably arranged on the second frame; a first linkage assembly arranged on the first frame, the first linkage assembly having a first chain sleeving a first and a second chain wheels, the first chain wheel being coupled to the crank; a second linkage assembly arranged on the second frame, the second linkage assembly having a second chain sleeving a third and a fourth chain wheels, and the fourth chain wheel being coupled to the wheel shaft; and a transmission module having a first and a second universal joints connected to two ends of a telescopic cylinder respectively, the first universal joint being connected to the second chain wheel, and the second universal joint being connected to the third chain wheel.