Spare as air tank.

I always run 70PSI in my spare as I have a hose made up with clip-on tyre chucks each end. If I see a tire low,on mine or another,I just clip on both ends,wait a few mins and it's done.Spare is then still safe to drive on..BTW,a mate and I put 140psi in a plastic soft drink bottle to try and destoy it (must be the six years of explosives,gunnery etc army) and the it just flattened out all the base wrinkles and sat there looking at us..We used a 14mm wad punch on the lid. Fitted a tubeless tyre valve and hose clamped the screw on lid.."Do Not Try This At Home"

Ron
Damn good idea , I also do same but don't exceed what the tyre Manufacturer has stamped on the sidewall ...just in case, In two spares you can carry enough extra air to just about reinflate the 4 tyres enough and then top off with the compressor if needed.
I just went and checked my Hankooks and the Max is 44psi where the BFGs are 65psi max

Doug

Hi Ron

There are some errors in this thread relating to LT tyres.

The maximum you refer to is usually the minimum.

The wording is usually Max load for inflation 65 psi or whatever

What this means is that if you USE LESS PRESSURE you will kill the tyre
as it requires that much air to hold that much weight.

There's a few different side wall wordings but I'll use a common example--

Example - common tyre BFG AT has written on side wall -->
Max Load 1380kg at 65psi cold

This means if you use less than 65psi and put that load (1380) on it it will die.

Typical practise is to put 10psi more than the mimimum to ensure tyre is safe.
E.G. 65 + 10% = 71.5psi

This is what I use all the time around 70psi , and used 100psi in competion etc.

The rupure pressure is a totally different story - and is not generally stated but
from other work I've estimated roughly 250psi.

Some passenger tyres have an actual max on them
e.g. from a commodore ss in the car park ->
Max load 630kg at 144psi max press

I.e. this weak tyre can only handle 144psi

Robin Miller

I couldn't imagine running 70psi in my BFGs off road or on road - couldn't afford the dental bill to replace all the fillings that would shake loose.

It's an interesting idea ... I remember years ago that my volkswagen beetle used pressure off the spare tyre to drive the windscreen washers. Worked fine.

Jack

I run 100+psi in my (racing) bicycle- would that be suitable???

Another idea is to use a SCUBA diving cyclinder. These will take over 2000psi. Enough to inflate many tires

Years ago I remember seeing Jack Absolome on one of his TV shows doing this on his Sigma I think he had and he had his spare at 100psi. Bloody mad in my mind on ordinary car tyres.

This is a good idea I got from somewhere a while ago ?

I have Bushranger compressor that has quick disconnect between compressor and hose .

If you lash out and get an air cleaning gun ( pem gun ) from auto store get the same male fitting as the compressor , with threaded fitting on other end of hose you can use the tyre as your reservoir and use the pem gun to clean things such as your air filter etc !

Glenn.

>> Trying to avoid fitting an air tank if this system has any merits.

Why is that?