Very sturdy and heavy duty built bike. My 7 year old loves it. He rode it 1 time and we had to switch it to the 14 mph mode because he said it was too slow! Only thing I'm not a fan of is the tt250 still has lead-acid batteries instead of lithium batteries like the rest of them. We chose this brand because a friend of a friend said they have had one for over 5 years and never had any issues.