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.

A bicycle sprocket comprises a sprocket body and 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 driving surface, a non-driving surface, a first maximum chain-engaging width, a first tooth center plane, and a first chain-facing surface. The first tooth center plane is defined to bisect the first maximum chain-engaging width in the axial direction. The first chain-facing surface is provided between the driving surface and the non-driving surface in a circumferential direction and is inclined with respect to the first tooth center plane in the circumferential direction. The at least one second tooth has a second maximum chain-engaging width defined in in the axial direction. The first maximum chain-engaging width is larger than the second maximum chain-engaging width.

A bicycle rear-wheel drive mechanism comprises a fixed shaft, a hollow toothed disc shaft, a wheel shaft, a sprocket shaft, an end cap and pin posts, the hollow toothed disc shaft is composed of a shaft cylinder and a toothed disc arranged at one end of the shaft cylinder, the toothed disc is provided with an array of semi-circular slots located at the edge of the disc body; in this design, the structure is stronger, the torque transmitted is greater, and the driving ability is stronger; replacing the original ball bearings used in bicycles with standardized tapered roller bearings allows the mechanism to be adjusted to the optimal axial and radial positions after installation, while also improving sealing performance and durability.

Various motorized mid-drive units are disclosed. The motorized mid-drive unit can be configured to drive a vehicle, such as a bicycle, having one or more cranks and a driven wheel. The motorized mid-drive unit can include an electric motor, a reducer, a gearbox (which can include one or more gears), a first one-way bearing, and a second one-way bearing. The first one-way bearing can enable power from the electric motor to be delivered to the driven wheel. The second one-way bearing can enable power from the one or more cranks to be delivered to the driven wheel. The reducer can reduce a rotational speed output from the electric motor which may be delivered to the driven wheel. The motorized mid-drive unit can propel the vehicle with the one or more cranks, with the electric motor, and/or simultaneously with the one or more cranks and the electric motor.

Various motorized mid-drive units are disclosed. The motorized mid-drive unit can be configured to drive a vehicle, such as a bicycle, having one or more cranks and a driven wheel. The motorized mid-drive unit can include an electric motor, a reducer, a gearbox (which can include one or more gears), a first one-way bearing, and a second one-way bearing. The first one-way bearing can enable power from the electric motor to be delivered to the driven wheel. The second one-way bearing can enable power from the one or more cranks to be delivered to the driven wheel. The reducer can reduce a rotational speed output from the electric motor which may be delivered to the driven wheel. The motorized mid-drive unit can propel the vehicle with the one or more cranks, with the electric motor, and/or simultaneously with the one or more cranks and the electric motor.

A drive chain system having a chain with an alternating succession of inner chain links and outer chain links, each inner chain link having a pair of inner link plates contacting the lateral faces of two rollers and each outer chain link having a pair of two outer link plates contacting the inner link plates of adjacent inner chain links. A pin connects two outer link plates and two inner link plates and a roller, wherein the inner surfaces of a pair of opposite outer link plates has protrusions in the area between the adjacent inner link plates. The system has a chainring with a plurality of teeth, which teeth taper laterally towards their respective tip.

A drive arrangement for a bicycle may include a plurality of sprockets arranged at a rear wheel of the bicycle. The sprockets may be particularly arranged to have a spacing that facilitates the configuration of an increasing number of sprockets in the plurality of sprockets. A singular front sprocket or chain ring may be used to drive the rear plurality of sprockets. The singular front chain ring may include first and second groups of teeth, the first group of teeth being wider than the second group of teeth. The drive arrangement may also include a rear derailleur. A chain having inner link plates with recesses may also be include in the drive arrangement.

A bicycle rotor comprises a base portion and at least one chain engagement portion. The base portion is configured to rotate around a rotational center axis of the bicycle rotor. The base portion is at least partly made of a first resin material. The first resin material has a first Young's modulus. The at least one chain engagement portion is provided on the base portion. The at least one chain engagement portion is at least partly made of a second resin material. The second resin material has a second Young's modulus. The first Young's modulus is higher than the second Young's modulus.

A vehicle-used crankset composite structure, comprising an inner ring piece made from a lightweight metal and a rigid tooth ring having a high wear-resistance and heat-resistance; a first joint surface is disposed on the inner ring piece; an inner ring hole is provided in the middle of the tooth ring; a second joint surface is disposed on the tooth ring; through welding the second joint surface to the first joint surface, the inner ring piece can be fixed into the tooth ring, and the inner ring hole of the tooth ring can be covered by the inner ring piece; according to the present invention, the integrality of the crankset can be greatly improved, achieving a lightweight structure and a high rigidity of the tooth portions.