saw this bicycle for repair in a friend’s bicycle shop. This is
a prototype used in Israel orchards to tow an agricultural harvest
trailer between tree rows. These harvest trailers carry a harvest
plastic box with capacity up until 400 kg of fruit. The combined
weight of trailer, box and fruit reach at least 500 kg. I joined
three pictures of the whole bicycle and details of drive train.
The right side is the drive side and you can see the difference
between the chain wheel and intermediate sprocket sizes. This beast
was built using the cheapest materials money could buy and consequently
is damage often with broken chains and bent wheels. Some improvements
include good quality 3/16 BMX heavy duty chains, 507 mm aluminum
double wall 36 spoke rims, BMX 14 mm axle hubs and finally double
butted 2.3 mm – 2 mm stainless steel spokes.
I will send you a picture of this bicycle performing its work.