They actually have a replacement rear wheel not on their site but if you call them and give them the model number and date of manufacter they will suggest a slighlty bigger size cost $15 bot sure if shipping is included.I need to replace mine also but just need washers.My wheel are slanted =(

Mine too. They don't have very good back wheels. However, I looked into getting a new one when they were still selling them on their site, and they were outrageously expensive. So we've just lived with a bum wheel for the past 3 years. Maybe that makes you feel better!