We got this e-bike for our 11 year old son. It is huge, and certainly adult size, but in a good way! I am 5'4” and it is larger than my bicycle. Our son figured out how to ride it without any issues. He could easily continue to ride this into his teens years, prior to getting him a car. He is currently 4'8.” We purchased the 1000w 20”x4.0 e-bike. My husband put it together within an hour or two. So far, we have had no issues with charging it and the 20mph max speed is perfect for our son, riding it through our neighborhood and up to the little shops out front. It was a great buy at $550 when we purchased it on sale, before Christmas in 2025. It would easily work for an adult too. My husband, 5'11” and 200lbs enjoys it as well.