I have had repeated problems with back tire going flat. Be sure you check out how VERY COMPLICATED it is to get that tire and tube out for repair. It took my mechanic husband two days to fix and the tire went flat again in about 15 minutes. We put in a cushion around the tire to protect from spokes but guess we need to put in several. Also, good luck finding a tube for this size tire.
I would suggest you look at other options before you decide to purchase. I could never get any response from Dave for repair manual or hints on how to fix the rear tire. They are MUTE when it comes to problems.