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 chainring may be used to drive the rear plurality of sprockets. A particularly configured tool may be used to configure the drive arrangement.

A transmission is provided comprising: a first pulley assembly rotatable about a first axis; a second pulley assembly rotatable about a second axis; an endless member coupling the first pulley assembly and the second pulley assembly; an idler pulley engaging the endless member and rotatable about an idler axis, the idler pulley being movable between a first position and a second position; a tensioner assembly coupled to the idler pulley, configured to control tension in the endless member and comprising: a tensioner spring having a spring axis and biasing the idler pulley towards the second position; and a tensioner arm rotatable about a tensioner axis and coupling the tensioner spring to the idler pulley, the tensioner arm defining a spring linkage extending between the tensioner axis and a spring coupling point, wherein a spring angle is defined between the spring axis and the spring linkage.

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 chainring may be used to drive the rear plurality of sprockets. A particularly configured tool may be used to configure the drive arrangement.

A continuously-variable transmission (CVT) assembly is employed for transmitting a torque from an external power-source. The CVT includes a variable-diameter input pulley and a variable-diameter output pulley, each having a respective range of adjustment. The CVT also includes a continuous torque-transmitting element extending between the variable-diameter input pulley and the variable-diameter output pulley, and thereby operatively connecting the input pulley to the output pulley. The CVT additionally includes a first elastic element having a first zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a first constant spring clamping force via the input pulley to the continuous torque-transmitting element. Furthermore, the CVT includes a second elastic element having a second zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a second constant spring clamping force via the output pulley to the continuous torque-transmitting element.

A drive mechanism for use with an implement comprising a driving sprocket to drive a rotatable workpiece and at least one intermediate sprocket of different diameter to the driving sprocket to allow for change of speed and torque of the rotatable workpiece.

A continuously-variable transmission (CVT) assembly is employed for transmitting a torque from an external power-source. The CVT includes a variable-diameter input pulley and a variable-diameter output pulley, each having a respective range of adjustment. The CVT also includes a continuous torque-transmitting element extending between the variable-diameter input pulley and the variable-diameter output pulley, and thereby operatively connecting the input pulley to the output pulley. The CVT additionally includes a first elastic element having a first zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a first constant spring clamping force via the input pulley to the continuous torque-transmitting element. Furthermore, the CVT includes a second elastic element having a second zero stiffness over the range of adjustment of the variable-diameter input pulley and configured to apply a second constant spring clamping force via the output pulley to the continuous torque-transmitting element.

A transmission is provided comprising: a first pulley assembly rotatable about a first axis; a second pulley assembly rotatable about a second axis; an endless member coupling the first pulley assembly and the second pulley assembly; an idler pulley engaging the endless member and rotatable about an idler axis, the idler pulley being movable between a first position and a second position; a tensioner assembly coupled to the idler pulley, configured to control tension in the endless member and comprising: a tensioner spring having a spring axis and biasing the idler pulley towards the second position; and a tensioner arm rotatable about a tensioner axis and coupling the tensioner spring to the idler pulley, the tensioner arm defining a spring linkage extending between the tensioner axis and a spring coupling point, wherein a spring angle is defined between the spring axis and the spring linkage.