So, the reason they go 20 mph is apparently because they're limited by law. From a quick search, electric scooters are legally classified as electric bicycles, so would also need to be governed down to that same speed to be road legal. If you don't really care about the legality, you could always get one of those DIY 2000w ebike kits and throw it onto a normal bike.
They're not that expensive, but I'd recommend getting an oversize disc brake kit for your bike, because the brakes on a bicycle are absolutely not meant to tote around a heavy bike going 40 mph, and frankly, neither are bike helmets. Protect your brain, get a motorcycle helmet in a bright colour, otherwise you're a silent, barely noticeable ghost, easily mowed down by an SUV driver.
So, the reason they go 20 mph is apparently because they're limited by law. From a quick search, electric scooters are legally classified as electric bicycles, so would also need to be governed down to that same speed to be road legal. If you don't really care about the legality, you could always get one of those DIY 2000w ebike kits and throw it onto a normal bike.
They're not that expensive, but I'd recommend getting an oversize disc brake kit for your bike, because the brakes on a bicycle are absolutely not meant to tote around a heavy bike going 40 mph, and frankly, neither are bike helmets. Protect your brain, get a motorcycle helmet in a bright colour, otherwise you're a silent, barely noticeable ghost, easily mowed down by an SUV driver.