Weight of Inflated Tire/Rim

[summerinmaine]

Has anyone ever weighed a deflated tire/rim combination, and compared it to the same combination inflated to"normal" specs (e.g. 35psi)?

 

I know that air has weight, and the weight of a particular volume of air depends mostly on temperature and pressure (which, of course, are interrelated). What I don't know, and haven't taken the time to calculate, is whether it's a meaningful amount compared to the overall weight of the tire/rim combination.

 

Anyone know?

[jeepcoma]

It's about 25-50 grams depending on the amount of volume of the pocket within the wheel and tire. In other words, insignificant.

[summerinmaine]

It's about 25-50 grams depending on the amount of volume of the pocket within the wheel and tire. In other words, insignificant.

 

 

Thanks.

 

The reason I asked was a suggestion from a friend that mounting a deflated spare under the MJ bed would take some weight/strain off of the cable mount, and that didn't make a lot of sense to me. I always carry a high speed/volume air pump with me on desert/Baja trips, so pumping up the spare before installation wouldn't be any big deal. Thus, I wondered if there was any benefit to the suggestion.

[BLHTAZ]

 

The reason I asked was a suggestion from a friend that mounting a deflated spare under the MJ bed would take some weight/strain off of the cable

Only if you are inflating it with water :laughin: ;)

 

If you have a cable that is still working, you are one of a rare few. Most, like mine, have broken and been removed by now.

[deziped]

Dang (Curse slang), I guess I should start knocking the mud off my spare before I crank it up. Good 3 pounds o mud on it. :doh:

[garmj]

You could try inflating the spare with Helium altho it might create rear traction problems. :smart: Hydrogen would also help but if you were in a rear end collision your Mj may end up looking like the Hindenburg. :nuts:

[tallon2064]

I must be under that lucky carrier star :bowdown: , because mine is in working order.

 

 

Wait I did a cable replacement and rebuild on it a few years back, :dunno: so I'm not sure it counts.:dunno: I do like them despite the possible problems and I've been carrying a 235/75/15 for awhile now, but I do check it regular.

[jtdesigns]

I don't understand some of yous... (except you summerinmaine) its a truck.. it has a bed... Throw it in the back and be done with it... :hmm:

[summerinmaine]

I don't understand some of yous... (except you summerinmaine) its a truck.. it has a bed... Throw it in the back and be done with it... :hmm:

 

Yeah, I don't have that option.

 

Based on the feedback from my companion thread in Tech, I'm going to inspect and lube up the cable, and fit a strap below the tire to serve as a back-up.