Lawn mower tires won't hold air? Fill them with foam and they'll stay firm forever.
I grew tired of having to air up the tires on my riding mower each time I used it. I tried “Slime” tire sealant, but with all the holes they had in them, the tires still went flat.
Then I had a hairbrained idea: inject all four lawn mower tires with foam. It worked great.
Here’s how to do it:
After a couple of uses, the tire softened up some and started to get a flat spot when it sat for a few days. To remedy that, I added more foam.
Even if I have to do this a few times, eventually I think the foam will be compressed to a certain point where it will not compress anymore.
If you don’t want to do all this, there are tire shops that will fill tires for you.
Here’s more information regarding foam-filled tires from Ken Burner’s Small Tractor FAQ website. — MOTHER EARTH NEWS
Urethane foam can be substituted for air in a tractor tire. Foam is available in several densities which approximate different inflation pressures. This is popular with construction equipment, but useful for small tractors as well. It is expensive: $40 or more for a small tire. Foam-filled tires are several times heavier than air-filled tires. Foam-filled tires are harder on a tractor’s steering mechanism than air-filled tires, since there is less “give” to the foam. Finally, foam filling does not make a thin tire stronger; in fact, it may put more stress on a tire than it was designed to withstand — resulting in a shredded tire with nothing to support the foam. So, this process is recommended only for heavy-duty tires. Most industrial tire dealers provide this service.”
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