I always liked the idea of the 'pizza pan' wheels to get a little more range. There are many ways to increase range and increase efficiency. Adding pizza disks to the wheels seemed like a very inexpensive way to get about 4-6% (depending on what source you believe and what speed you are driving at) more range. The Moon disk people wanted $150 for each disk plus $700 to create a mold and they would need a wheel shipped to them. Kind of defeated the idea of keeping it simple and inexpensive. So I found some pizza pans on Amazon, drilled 5 holes into the rim and attached them. I know many will cringe at the thought of putting holes into their rims, but I don't really care. So far I have done only the front wheels as a test and see if any issues come up. Once it all goes well and I have all 4 wheels I will do a test to see how much of a difference it makes. Here is a photo of the disk. Everyone that saw it thought it actually looked good.