[John Palasek]

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If there's no puncture and your tires are tubeless, then you most likely have a rim leak (very common). If you use inner tubes, then you most likely have a valve leak.
Unless you're very meticulous about keeping the valve caps on, valve leaks are very common on wheelbarrow tires because we push them through all kinds of muck and we get all kinds of junk stuck in the valves.

To fix a valve leak, just go to an auto parts store and pick up some new valves. They usually sell them in 4-packs and it comes with a little wrench.

I use tubeless tires and I usually lose some air in a few tires over the course of a week or so. It's because the rims are banged up and that's not going to change. What I do is carry a portable emergency compressor (the kind you get as a Christmas present from worry-wart in laws) and I keep it stashed in the back of the truck.
It plugs into the cigarette lighter socket in the vehicle and it can inflate anything up to around 100 psi. Of course, by the time it did that, I'd be in a nursing home, but for a wheelbarrow tire (about 30 psi) it takes less than five minutes. So what I've done is to simply live with the air loss and inflate them as needed, when needed.


It's a lot easier than changing out tires all the time.



-JP