Horrible to deal with. Unprofessional, unknowledgeable, difficult to get a hold of, We had parts missing on our order, when we spoke with Steve about the missing parts, he said "go to a hardware store" When we asked about torque and tire pressure, one person said on thing and another person had a different answer, both wrong, as we found out later. My husband is a professional and has been building dirt bikes and riding motorcycles since he was a kid, and always takes the extra step to make sure what he is doing is according to specs. GoKartsusa should try to get their act together or get out of the business. This is a family project we are working on with and for our grandson, to teach him how to build something with his hands. This project is turning into a family nightmare.