Q for Diamond & Others

Submitted: Thursday, Jul 03, 2003 at 21:50

ThreadID: 5799 Views:2137 Replies:6 FollowUps:4

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Member - Cocka

I'm carrying a couple GY Wranglers 285/75 tyres as spares.
I want to over inflate these as spare air tanks and have an air transfer hose.
The tyres are marked with a max air pressure figure but I think that that is only when they are under load, I wouldn't be using them on the highway with anything other than the usual recomend pressures. So -
What is the max pressure (psi) to which you can inflate a tyre for the purpose of storing backup air ?? Carpe Diem

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Reply By: Truckster (Vic) - Thursday, Jul 03, 2003 at 22:02

Thursday, Jul 03, 2003 at 22:02

You can get a truck air tank for $20 from truck wreckers. Much much safer and will do more... if your keen you can have it connected to your onboard compressor and have endless high pressure, which is a hell of a lot safer.

There was a post on one forum about a tire exploding on a bloke that was overinflated, luckily nobody was killed, it went off late in evening. He soon became center of attention in the camp ground!

YMMV.

AnswerID: 24146

Follow Up By: Member - Cocka - Thursday, Jul 03, 2003 at 22:53

Thursday, Jul 03, 2003 at 22:53

I guess that's why I'm asking the Q. The Q should say "safe maximum p" . Any ideas 70-80-90- ??Carpe Diem

FollowupID: 16249

Follow Up By: Truckster (Vic) - Thursday, Jul 03, 2003 at 23:12

Thursday, Jul 03, 2003 at 23:12

What is the max on the sidewall? Check there first.

Usually around 60psi aint it? depending on tire and brand and size model etc..

FollowupID: 16251

Follow Up By: Member - Cocka - Thursday, Jul 03, 2003 at 23:26

Thursday, Jul 03, 2003 at 23:26

read my lips - I said the tyres are marked with a max pressure but .......... ........ .........
It's 70psi.Carpe Diem

FollowupID: 16255

Follow Up By: Truckster (Vic) - Thursday, Jul 03, 2003 at 23:37

Thursday, Jul 03, 2003 at 23:37

Then 70 would be the safest .. Wouldnt it?

When they fit tires, they go upto 100psi to bead them on the rims sometimes, thats only for a minute, then they deflate the tire... but most modern tires I've seen dont need anything like that.

You may put 70psi in the tire, but if your out in the sun, its going to get hot and expand, and its your call what you do. Theres dudes on patrol list runnin 120psi in spares for some reason...Crazy to me.. So you get a flat tire or 2 and you lose your 'air tank'...

The price of doing it right, and having seen personally the damage an exploding tire can do to a body (although that was a truck tire not a 4wd), I'll go the small tank (good for beading tires) $20 + bracket, and fittings $50 tops option.

You can get a tank big enough to inflate 4 tires for around $60 at truck wreckers, Nick got another one the other day for his GQ.