They are indeed some Klogger Kustom Wheels, Speed tested to 50 mph. I am kind of surprised they are leaking, I never had any issue with them? Looks like if you cleaned the rim it would seal.
Oh and I have some 37" MTR's with lots of tread, I have 4, they are 15" rim. $400 for them. After I stopped using the tires you have now, I used these on the klogger. I think there are pictures of the current tread in my yota thread.