Hey Dylan, welcome to the Rad gang here.
If you really want to ride a small e-bike in the 40 mph range, I would be thinking of getting a bike factory-designed, tested and equipped for that, with suspension, frame, lights, tires and especially brakes to match. No telling what the handling and stopping characteristics of those Rad bikes are like at that speed, although I suspect somebody on this forum has been there with them and could comment. I've taken my MiniST2 up to slightly over 30 downhill with the factory setup and thought it was getting a little squirrely. And do you really want to ride one past a cop at 40 mph?
I've ridden my Honda ST1100 close to 140 mph, so not too intimidated about higher speeds on two wheels per se, but am older and slower now; I'm cool with 25-30 on my MiniST but the 35A controller upgrade I bought for it is to bump up torque, not speed, for climbing hills.
If you really want to ride a small e-bike in the 40 mph range, I would be thinking of getting a bike factory-designed, tested and equipped for that, with suspension, frame, lights, tires and especially brakes to match. No telling what the handling and stopping characteristics of those Rad bikes are like at that speed, although I suspect somebody on this forum has been there with them and could comment. I've taken my MiniST2 up to slightly over 30 downhill with the factory setup and thought it was getting a little squirrely. And do you really want to ride one past a cop at 40 mph?
I've ridden my Honda ST1100 close to 140 mph, so not too intimidated about higher speeds on two wheels per se, but am older and slower now; I'm cool with 25-30 on my MiniST but the 35A controller upgrade I bought for it is to bump up torque, not speed, for climbing hills.