75miles, at least 8-9kwh of energy on board.... so start saving for batteries... they'll cost about $5k plus BMS/charger, then there's another 2-3k for motor and controller.... plus chassis, plus DC-DC converter, plus contactor, cables, battery rack/motor mount fabrication, rear sprocket, front sprocket, chain, gauges, throttle.......
60mph+, maybe go with AC to start with.... or dual agni's.
you can do it, but you'll spend a lot getting the 75miles range, and I mean, the bike (and everything) will cost over $10k
