It has a lightweight aluminum frame that lets users ride harder for longer, providing a reliable experience. I was a bit surprised by this because the manufacturer should have sent us the part since the bike was just ordered brand new and we had the order number and receipt. For a product that would have cost the company a minimum of $10 to ship out, I did find it a bit frustrating that their customer service was so poor and we ended up having to pay for the replacement ourselves. The Back tire isn’t fitted in place correctly and is slightly too high up on the rear tire axle shaft. It appears to be tightened in place and secure by the nut screw, but it creeps me out a bit that if the nut were to unscrew a bit the tire would fly out…. I tried to unscrew it and snap it in place, but the machine that put the nuts on really did a job and got that thing on really tight, so I decided to leave it alone.The last and probably the biggest problem was that there was no quick release for the bike seat, it was missing from the set.