ADY extra shifter

On ADY the normal shifter is a little limited, being from a boy bike and with a 24" wheels, then one other gear change has been inserted. Putting the chain line, from the pedals to the bottom bracket, on the left side it’s possible to use an extra derailleur for three gears. With this configuration in order to use this shifter you must pedal in the opposite direction. This is not a problem since it is used sometime in order to choose the modality of : climb, normal or speed.
Indeed it's a comfort, when stopped half of a climb, the possibility to shift down and then restart.




Being made in order to be mounted to right, to have a regular operation, the derailleur had to be mounted under the three gears to be able to work on the “climb” of the chain, so mounting on the top you must reverse the direction.
Turning the pedals group, to have the gear on the left, the pedals have the thread reversed and therefore not self-locking and the same one can happen for dice of implantation of the bottom bracket if that one is also turned.
Obviously must be used grains or screws to block them. The chain tensor is derived from a shifter “posterior derailleur” modified and the chain guides from recovered gears and mounted on bearings (two for gear).      The two front gears, counter-rotating, have a guide in bakelite in order to avoid fall of chain.

The ratios are 42 / 30-42-52 and 24-34-42 / 12-14-16-18-21-24-28.   Covered distance every turn of the pedals:  minimum 1,3 m   maximum 9,4 m.
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