Interesting that they've gone fully mechanical with bevel gears and shafts. The motorcycle equivilent by Yamaha uses a gearbox driven pump to drive an impeller (like in an older automatic car gearbox) that in turn drives the front wheel. Before that Drydale engineering made a similar hydraulic system for trail bikes but I dont know where that led to. I guess most riders are not going to pedal fast enough or reliably enough to successfully drive a hydraulic pump hence the mechanical approach. I'll bet its a hoot to ride in mud! Any ideas on total weight?