STingray1300

I have the Viair listed below. It does a very admirable job of airing up 4-12x34 tires. I'm thinking that I would like to install onboard air at some point though. Be mindful that compressors get quite hot (not warm.... HOT) when doing that much work. Also, if you do get a compressor, the first thing you'll want to do is ditch that stupid coiled plastic air line in lieu of a hybrid compound hose (not coiled). Man that coiled plastic is annoying to use!

fcancer

by ant chance will any of these seat a bead

suicideking

Agree with this. Those coiled hoses are a pain because they always get tangled. I keep mine as a spare, but replaced with with a braided plastic hose.

Also get one long enough to easily reach all four wheels. Not as much of an issue with a portable compressor because you'll have some play in the cords. More important if you go with onboard.

The best air compressor out now is the ARB twin. It's expensive though, over $500.

You'll have a hard time re-seating a bead with most compressors. The most powerful would be more likely.

If you want to be able to re-seat a bead, you'll want a CO2 tank.

DavidKR

convenient timing for this old thread to get bumped. is there any reason why the VIAIR 300P mentioned above woudn't be able to air up a 37" tire, with a decent hose?

STingray1300

The Viair should do just fine on a 37".

suicideking

The 300P might get the job done, but I'd consider the 400P, 400, or 450. The 300 is rated for 33", 400 for 35", 440 for 37".

So also depends on how much you're airing down. If airing down to around 10 - 15 psi, I'd go with the 400 or 440. If you don't air down that much, might be ok with the 300.

Unless you go with the 450, they're all 33% duty cycle. So they can overheat and shut off. I've seen the 400 overheat trying to air up 35's from 10 psi to around 30psi. It can depend on the weather too. During the summer they will overheat quicker.

If it overheats, you just have to wait for them to cool off to continue airing up. It won't break the compressor.

The 450 is 100% duty cycle, so won't overheat. Although it's slower to air up than the 400. Lower output to insure it won't overheat.

DavidKR

thanks guys. I don't see myself airing down lower than 15-20 psi but I don't see the harm in spending the extra $40 for the 400P. I do want to stick with a portable option.

fcancer

Sorry I should have been more specific ,,,,I dont know if it will make a difference but I referring to ATV tires. 27x12x14.