I was looking into replacing my air tires on my 1st gen Speed Cart from, the solid tires are $52.50 and you need a fork kit $15 both from Sun Mountain.
I haven't had any flats only the annoying leakage and used to go to cart barn to top off the air.
I hadn't used it in 10 yrs or more as most of the guys I played with rode, and now I have a portable air compressor that fills each tire in 1 minute .
Instead of getting the solid tires for now, I got some of this 'Flat Out' from Amazon.
I'm in So Cal and won't be going through any thick weeds, I hope