1. What about rear?
2. How do you maintain tire pressure?
It looks like the pneumatic rear wheel assembly can be ordered from the manufacturer as a special-order item. Unfortunately, we do not yet have the pneumatic rear wheel assembly listed on our website so orders for it must be placed over the phone - the part number is G45-4302.
Golden Technologies recommends maintaining the tire pressure at 40PSI as if the pressure drops below about 36PSI, the tire may look okay but the tube will be deflated enough that it may get a flat if used. You can use a tire gauge (such as our item number P38-2021) to check the pressure, and you can either use an air pump or air compressor to inflate the tire to the recommended PSI. It is recommended to check and maintain the tire pressure at least every other month.