Does anyone know how much a tire holds in gallons,
the reason I ask is when airing up after wheeling, say you have a 5 galloon air tank with no compressor is that enough for all four tires or just one. ( say they around 33"-36" tires )I'm trying to figure this out so I don't have to rely on those little pumps. thanks

 

Couldn't tell you in gallons but from previous experiance I would say a five gallon tank would only fill one tire(33-36" diameter)...and that depends how far you air them down.They make bigger tanks but even a 8 or 10 gallon tank would probably only fill two tires max.

 

You wont be able to air up 4 large off road tires,from a 5 gal(or even 10 gal)tank of compressed air.There just isnt enough stored volume of air. There are a few options. On board my F250 I use a 5 gallon tank(used for welding) with a regulator.You can take it to a welding supply and have it filled with CO2. this will fill my 36" or 38" tires from about 8 psi to 35 psi at least 10 times.Its not unlimited but it is very fast,about 90 seconds per tire. On board my Wrangler I use a Quick Air II 12 Volt compressor with a two gallon tank,the tank gives you enough stored air to reseat a tire,and the compressor will fill my 33 x 10.5/15s in about 2 1/2 minutes from 6 psi to 33 psi.Its a little slower but on a long trip you never know how many times you will need to use it and its always there. the other option is to use an AC compressor plumbed to a storage tank,(this is very popular among many hard core wheelers).
Jeff