clockwise direction bevel gear 34 also rotates in the clockwise direction via fastener 38 which is fixedly attached to pedal arm 5 and bevel gear 34 this action causes bevel gear 32 to rotate in the counterclockwise direction via reversing gear 40 since bevel gear 32 is fixed to pedal shaft 6 pedal shaft 6 will rotate in the counterclockwise direction along with bevel gear 32 pedal shaft 6 can rotate in the opposite direction of pedal arm 5 because pedal arm 5 rotates around pedal shaft 6 on bearing 47 the counterclockwise rotation of pedal shaft 6 causes freewheeling clutch 19 to engage thereby causing bevel gear 18 to rotate counterclockwise in unison with pedal shaft 6 the counterclockwise rotation of bevel gear 18 causes bevel gear 16 to rotate clockwise via reversing gear 20 the clockwise rotation of bevel gear 16 causes rear wheel 10 to also rotate in the clockwise direction via pedal sprocket 15 and chain 13 when pedal arm 5 is driven in the counterclockwise direction bevel gear 34 also rotates in the counterclockwise direction via fastener 38 this action causes bevel gear 32 to rotate in the clockwise direction via reversing gear 40 which in turn causes pedal shaft 6 to rotate in the clockwise direction since bevel gear 32 is fixed to pedal shaft 6 the clockwise rotation of pedal shaft 6 causes freewheeling clutch 17 to engage thereby causing bevel gear 16 and the pedal sprocket 15 to rotate in the clockwise direction with the above arrangement the bicyclist.