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So as a bicycle needs 2 independant brakes to be road legal
Dang pt2! Back in the mid 70's I'm sure my Dad reckoned that scraping my Plimsolls along the ground and shouting "AAAAaaarrrrrrrrrrrgh!" constituted as a brake system as I only had one brake on the converted Chopper I was riding at the time! :)
FatManOnAFixie
Only the front wheel is braked, unless there is a form of coaster brake in the rear axle.
So as a bicycle needs 2 independant brakes to be road legal and a double front is easy to sort out and a cheap conversion or it may have been built that way.
Drum brakes and coaster brakes need a torque arm anchored normally to the chainstay which is a bit awkward to do and the frames tend to be designed around a brake system.
Discs would be good, but again the caliper mount needs fitting, and cost of hubs and wheel rebuilds.
Good chance of doing stoppie with dual v's up front, it's for the tricks :)