Like the Currie, the Rayos has a lot of torque, independent human and electric drive systems, and a drive system that freewheels when not in use. The electronics shut the motor off at 80% battery discharge to avoid a full discharge (which really shortens the life of lead-acid batteries). The Rayos is an 8-speed bike that uses standard bike parts. Seats, handlebars, brakes and other non-electric parts can be found at a supercenter or bike store. Electric parts can be obtained from Rayos dealers.
Back to the bike. I’ve gotta be honest, it doesn’t look half bad. The battery fits into the downtube, which is way better than those crazy brackets you see on cheap ebikes. The welds are also smoothed over, like an old Aluminum Cannondale. The drivetrain is a mix of parts, with Shimano Altus in the rear. Altus is a mountain bike groupset, but on the very low end.
Have to give a shout out to a Bulls Brose option. They were the first manufacturers I saw integrate the battery into the frame really well, and they’ve continued to improve upon that design. As I mentioned above, I love the wave frame. Super easy to get on and off and it’s got a cool look as well. If you’re not a fan, this bike does come in both a Diamond and step-thru frame.
Because e-bikes are capable of greater speeds for longer periods of time than standard bikes, you want extra control. Wider tires provide traction and some bump absorption with little penalty. You also want strong brakes to slow you (and all that extra weight) easily. It's worth looking at the quality of the brakes and investing in bikes with better ones if you can.