The actuator has a strap (20) forming an interior space in which a pedal drive shaft (10) i.e. crankshaft, is extensively received. A lever (30) is supported in an inner space of a rotary bearing (32). The lever comprises a circular guide (62) arranged within the strap, which is stretched through the circular guide based on an angular position of the lever. A stopper (70) is arranged at a side of the lever opposite to an operation direction of the actuator and fixedly arranged opposite to the inner space. Independent claims are also included for the following: (1) a treadle gear comprising a support (2) a method for generating a brake actuator movement for a bicycle.
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