Wheel hub arrangement for a drive with rotated drum that has a stationary shaft (13); a hollow drum (19, 20) arranged by bearings around it, a wheel drum (32) that includes a hub of the driven wheel, and freewheels, inner sleeve (21, 22) which are arranged around the stationary shaft (13) by bearings, and placed partially in the cavity of the drum (19, 20). The wheel hub arrangement for a drive with rotated drum for bicycles, street stepper vehicles, wheelchairs and tricycles.

This Tandem bicycle design describes a reduced linear dimension, whereby the inherent polar integrity of the tandem structure is reduced.

Due to the close proximity of the cyclist, balance and coordination is more rapid and spontaneous.

The gear construct is comprised of a system of three cranking sprockets, closely arranged in a forward (one) and rearward pair. The forward and rear gears closest to the bicycle frame; coupled to a timing chain, functions as the timing mechanism. The rearward outer gear functions as the driving gear connected by a power chain to the rear wheel sprocket(s).

The handlebars required by the rear cyclist necessitates an innovative base connected to the bicycle frame located behind the front cyclist seat collar.

A locking mechanism on the handlebar coupler allows deployment of handlebars from retracted, to the riding position.

This Tandem bicycle design describes a reduced linear dimension, whereby the inherent polar integrity of the tandem structure is reduced.

Due to the close proximity of the cyclist, balance and coordination is more rapid and spontaneous.

The gear construct is comprised of a system of three cranking sprockets, closely arranged in a forward (one) and rearward pair. The forward and rear gears closest to the bicycle frame; coupled to a timing chain, functions as the timing mechanism. The rearward outer gear functions as the driving gear connected by a power chain to the rear wheel sprocket(s).

The handlebars required by the rear cyclist necessitates an innovative base connected to the bicycle frame located behind the front cyclist seat collar.

A locking mechanism on the handlebar coupler allows deployment of handlebars from retracted, to the riding position.

A foldable electric scooter and a manufacture method of the same. The foldable electric scooter includes a main body assembly, a front fork assembly located at the front end of the main body assembly, a rear fork assembly located at the rear end of the main body assembly, a telescoping plate assembly located on top of the front fork assembly and a handlebar assembly located on top of the telescoping plate assembly. The foldable electric scooter has a double headset design that increases a rake angle for more steering stability while still keeping the steering upright for an upright holding of the handlebars. The foldable electric scooter is manufactured by stamping of flat plate material.

A foldable electric scooter and a manufacture method of the same. The foldable electric scooter includes a main body assembly, a front fork assembly located at the front end of the main body assembly, a rear fork assembly located at the rear end of the main body assembly, a telescoping plate assembly located on top of the front fork assembly and a handlebar assembly located on top of the telescoping plate assembly. The foldable electric scooter has a double headset design that increases a rake angle for more steering stability while still keeping the steering upright for an upright holding of the handlebars. The foldable electric scooter is manufactured by stamping of flat plate material.

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

A drive system for a vehicle includes a chain ring and a drive chain. The chain ring has a plurality of teeth serially arranged and joined to one another. A first subset of teeth has a first outer face that applies a lateral pressure to a link of a drive chain in a first direction. A second subset of teeth has a second outer face that applies a lateral pressure to another link of a drive chain in a second direction. The teeth all have substantially the same width. The top surfaces of the teeth are offset from the centerline of the drive chain. The centerlines of the top surfaces of the teeth are arranged asymmetrically on one side of the centerline of the drive chain.

The present invention relates to a bicycle chainring (1) for engagement with a drive chain provided with rollers, the bicycle chainring (1) comprising: a plurality of teeth (2, 3) extending radially from a periphery of the chainring (1), wherein the plurality of teeth (2, 3) comprises a plurality of narrow teeth (3) and a plurality of wide teeth (2), wherein each tooth (2, 3) comprises a front flank (5) and a rear flank (6) with respect to a drive direction (DD) and two opposing side surfaces (9), wherein at least one side surface (9) of each wide tooth (2) comprises a protrusion (7) extending therefrom in an axial direction of the chainring (1), wherein each protrusion (7) comprises a respective groove (8) arranged halfway between a top land (10) of the respective wide tooth (2) and a root circle (11) of the respective wide tooth (2), wherein the groove (8) extends throughout the protrusion (7) in a direction substantially parallel to the top land (10). The invention further relates to a bicycle comprising the of the invention chainring (1).

A bicycle chain ring has a ring body having an inner diameter edge and an outer diameter edge. The outer diameter edge has a plurality of teeth for engaging a bicycle chain. The chain ring further includes a shared bolt hole through the ring body; a first set of three bolt holes through the ring body that are positioned in circumferentially spaced positions so that the shared bolt hole and the three bolt holes of the first set align to mate with the 4-bolt bicycle crank; and a second set of four bolt holes through the ring body that are positioned in circumferentially spaced positions so that the shared bolt hole and the four bolt holes of the second set align to mate with the 5-bolt bicycle crank.

A bicycle sprocket is basically provided with a sprocket body and a plurality of chain-driving teeth. The sprocket body includes a central portion, an annular portion and an intermediate portion. The central portion has a central opening through which the rotational center axis passes and a plurality of internal splines for engaging external splines of a crank arm. The annular portion is disposed radially outward from the central portion with respect to the rotational center axis. The intermediate portion extends between the central portion and the annular portion in a radial direction about the rotational center axis. The plurality of chain-driving teeth extends radially outward from the annular portion of the sprocket body to engage with a bicycle chain. The sprocket body and the plurality of chain-driving teeth are formed as a one-piece, unitary member.