If you want to buy a bike click https://store.segway.com/segway-dirt-ebike-x160-x260
Light Bee electric off-road bike
6061 Aluminum is junk for sprockets,
beware of sprockets not made of 7075
aluminum. 7075 is 3 times the cost of
6061. No legitimate sprocket maker
would use 6061 material.
It's cheap for a reason