A bicycle front derailleur with an integral cadence sensor serving to guard against undesirable actuation of either front or rear derailleur without necessary chain movement being present and additionally making use of a standard wireless remote control (RC) servo drive unit relying exclusively on spur gearing reduction facilitating highly efficient and accurate derailleur positioning thereof through a magnetic rotary encoder with direct sensing of derailleur position and with alignment of derailleur actuation components thereof in the horizontal plane guarding against undesirable transmission of gravitational and vertical inertial forces to wireless remote control (RC) servo drive unit adversely affecting accuracy.

A device for mounting a front derailleur on a bicycle frame is provided. The device comprises engagement means for engaging with at least one toothed crown of a crankset and with the derailleur, the engagement means being configured to obtain a desired relative position between the at least one toothed crown and the derailleur. A method for mounting the front derailleur on the bicycle frame is also provided, such a method providing for the use of the device.

A device for mounting a front derailleur on a bicycle frame is provided. The device comprises engagement means for engaging with at least one toothed crown of a crankset and with the derailleur, the engagement means being configured to obtain a desired relative position between the at least one toothed crown and the derailleur. A method for mounting the front derailleur on the bicycle frame is also provided, such a method providing for the use of the device.

In an aspect, a compactable bicycle is provided and includes a frame A first frame portion has a steering structure, which has a front wheel. The steering structure further includes a handlebar. A second frame portion has a rear wheel. In a use position the first and second frame portions are unfolded to an unfolded position. In a storage position the first and second frame portions are folded to a folded position, in which the front wheel and the rear wheel are next to each other. The front wheel has a front wheel connector and the rear wheel has a rear wheel connector that is releasably connectable to the front wheel connector to hold the front and rear wheels together.

A chainring protection system includes a chainring having a torque input section and a torque output section. The torque output section is radially outer relative to the torque input section and has a plurality of teeth. The chainring protection system also includes a cover connected to the chainring, such that the cover at least partially covers a circumferential portion of the torque output section. The circumferential portion of the torque output section includes less than all teeth of the plurality of teeth.

A chainring protection system includes a chainring having a torque input section and a torque output section. The torque output section is radially outer relative to the torque input section and has a plurality of teeth. The chainring protection system also includes a cover connected to the chainring, such that the cover at least partially covers a circumferential portion of the torque output section. The circumferential portion of the torque output section includes less than all teeth of the plurality of teeth.

A single-sprocket system for integration into a bicycle trainer, the system including a sprocket having teeth about a perimeter of the sprocket, a first planar side, and a second planar side, wherein the teeth of the sprocket are configured to engage a chain of a bicycle mounted to the bicycle trainer. The system further includes a first chain guide adjacent the first planar side of the sprocket, wherein the first chain guide is configured to re-engage the teeth of the sprocket with the chain when the chain has become disengaged from the teeth of the sprocket towards the first planar side, and a second chain guide adjacent the second planar side of the sprocket, wherein the second chain guide is configured to re-engage the teeth of the sprocket with the chain when the chain has become disengaged from the teeth of the sprocket towards the second planar side.