just a quick question

[speedminded]

I'm a little late on this thread but how much to you suppose 38lbs of air in a tire weighs? Ever taken a wheel off and weighed it then weighed it again with the valve stem out...?

Yeah, helium is lighter than air but you would save 100+ times more weight just by taking one lug nut off each wheel.

*edit*
got bored.. 26" tire 8" wide 4" thick is about 2,000 cubic inches...61 of those in a liter so that makes each tire hold about 33.5 liters. A liter of air weighs in at 1.25 grams while a liter of helium is 0.1785 grams. Sooo..about 40 grams of air vs. 5.959 grams with a differance of 34 grams, multiply that by 4 for each tire and you have a total weight savings of 136 grams or 0.29 lbs, lol.

[chuck]

got bored.. 26" tire 8" wide 4" thick is about 2,000 cubic inches...61 of those in a liter so that makes each tire hold about 33.5 liters. A liter of air weighs in at 1.25 grams while a liter of helium is 0.1785 grams. Sooo..about 40 grams of air vs. 5.959 grams with a differance of 34 grams, multiply that by 4 for each tire and you have a total weight savings of 136 grams or 0.29 lbs, lol.

wouldn't tire pressure come into that equation somewhere???

[speedminded]

wouldn't tire pressure come into that equation somewhere???

I was wondering that too...maybe everything needs to be multiplied by the psi...not sure though.