drive gear 18 is driven by user pedal 16 input rotation of the drive gear 18 rotates a first threaded gear rod 19 which is mated to the drive gear 18 the drive gear 18 has several rows of delimited gear pitches annularly situated about its first surface the first gear rod 19 mates to a specific pitch that corresponds to a specific speed ratio and can be adjusted by translating radially with respect to the drive gear 18 to update which pitch delimitation it is meshed with adjustment of the first gear rod 19 is accomplished by a control wire 21 that changes the position of the gear rod 19 the control wire 21 routes through the frame 11 to the handlebar stem 15 the gear rod 19 employs gear splines along its length to which is mounted a first connecting rod 22 the connecting rod 22 transfers rotation to a second connecting rod 23 which transfers the same to a first disk gear 24 the first disk gear 24 employs an asymmetric gear pitch on its opposing sides the first side connects to the second connecting rod 23 providing only a single outer set of splines to receive input from the second side of the disk gear 24 is similar to the drive gear 18 wherein a plurality of gear pitch ratios is provided moving radially outward from its center of rotation a second gear rod 25 connects to this second side of the disk gear 24 providing a second set of gear ratios to choose from in a similar manner as the drive.