I bought two of these at the same time for my 10 year old and 11 year old sons. They are small for their age, but the bikes are definitely not too large. The funny thing is that the bikes also didn't seem too small when I couldn't resist and took one for a spin in the backyard. I'm 135lbs and 5'9" tall and the bike handled me just fine. My sons love these bikes. Everyday when they get home from school they ride around our backyard until the battery indicator turns yellow (about 40 minutes). So far, they have recharged them overnight after each use, but the charger light turns green much sooner than the 12 hour recommended charge time. The bikes are heavy and very sturdy. My kids love running them up and down the small hills and dips and bumps in our 2 acre yard. They go about as fast as a vigorously pedaled bicycle, so I think the 15 mph top speed is about right. When I first opened the boxes and looked at the instructions, I groaned at the 30 minute estimated time to assemble, but it actually went very fast. All you have to do is attach the front fender, the handle bars and the front wheel. It was very easy, much to my relief. Overall I am very satisfied with this purchase.

Rear brake assembly failed , then they wanted to sell the new part for $12 with $13 shipping
Disappointing that these things don't last longer
Bike was lightly used by a light kid

My 2 sons loved the dirt bike, but it shorted out after one ride through a puddle. Very disappointed that it did not last more than 2 weeks.

my son is six and a little small for his size, so i was cautious buying this bike. but it fits him well and since its just a little big for him i can see him using it for a least a few years before he is ready to trade up.

I purchased two at the same time one for each of my boyz and they love them they are 8 and 10. One of the bikes front brakes rubbed from day one and a few weeks later the rear wheel sprocket broke. Therefore, after I called Razor there was no service center to bring the bike to, so they were very nice about sending me the complete front and rear wheel so I could repair the bike myself.