Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Rear wheel is a problem

We bought this for our 10 year old son for Christmas and it has already broken after riding it a dozen or so times. My son only weighs 75 pounds and he rode it on the street and on grass. Now the back gear is stripped and the rear wheel will not move. I wish I had read the reviews by others about the rear wheel problem. This is a very common problem and yet Razor will not replace it once you are out of the 90 day warranty period. The rear wheel costs $50 to replace, so if you buy this product plan on replacing the rear wheel assembly.