Coyote Automatic Tire Deflators

I usually like to drive fast enough to essentially skip across the tops of the washboard rolls which seems to be between 30-35mph. In sand or on rocks reducing your tire pressure makes you have a larger tire tread contact patch and softer, more flexible and pliant face and sidewalls which help grab hold off, roll over or push through those sorts of obstacles. With properly deflated tires this can give you a relatively plush ride instead of the usual teeth-jarring, bone-rattling or wheel spinning.

old, solid rubber tread on rusty metal wheel
When we don’t want to feel like we’re riding on these

For quick tire deflation duties I use a set of Coyote Automatic Tire Deflators.

Thick Vinyl Case that hold the deflators
In Their Thick Vinyl Case

They received good, consistent reviews on Amazon, were a step cheaper than the Stahn option and they are made in the US. I chose the model with the 3-50 psi adjustment range.

What Comes in the Package. Quarter For Scale.
What Comes in the Package. Quarter For Scale.

They’re quite small (36.7mm X 15.9mm/1.445″ X 0.625″) but feel nice and solid. Why? Well that’s because they are constructed of 100% solid brass. They come set from the factory for ~ 12 psi. Since I don’t have bead locker wheels I was apprehensive about airing down into the teen or even single digit psi range so I immediately swapped the factory installed silver springs (5-20 psi) for the included red springs which have a 5-50 psi range. After a couple of tries adjusting them, re-inflating the tires and seeing where they stop I’ve gotten them all to stop deflating at ~20 psi, warm, at sea level. It takes a couple tries but once you fine tune and set the psi where you want it you can assume it will just always work as you expect. They work incredibly easy. Twist on, pull ring, tires deflate to set pressure. Remove.

Tire Deflator connected to tire
Performing Its Duties

By the time you are done putting on the fourth one, the first one is usually done or close to it.

Aired down to 25psi
Aired down to 20 psi

There is obviously some wiggle room when you factor in substantially higher elevations and/or wild temperature swings. I’ve used them from sea level to 7800′ or so and from 70 deg F to around 0 deg F and am seeing, at most, a 5 psi swing range. They still stop at the same psi as one another regardless of the environment though and predictable and consistent is good.

After the fun we’ve had being aired down the last thing we have to do when reaching a paved road is to re-inflate my KO2’s and we do that with our MV50 Compressor.

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