I've been through this many times. Fix-a-flat doesn't work because the wheels never travel at any speed. You are supposed to put he fix-a-flat in and then drive to spread it around.

Put tubes in the tire that's leaking. Go to a tire place that can handle it. Not all have the proper machine for doing this. I've been charged anything from $15 to $60 dollars so shop around. The most expensive places were ATV dealers. The cheapest was Tire America here in town.

If you use your wheels in salt water the valve stem will corrode and need to be replaced every few years.

Mike Hill
www.stlouiscats.com