free website stats program Air Pressure in Tires | Page 2 | Harley Davidson Forums

Air Pressure in Tires

Check your pressure with the bike in the air then check it on the ground, wow no difference. The internal air pressure does not change with added weight.
 
Animal said:
Check your pressure with the bike in the air then check it on the ground, wow no difference. The internal air pressure does not change with added weight.
Click to expand...

HMMM but what about the external pressure when the weight is on , how does that enter the equation or doesnt it?
 
Animal said:
The internal air pressure does not change with added weight.
Click to expand...

It depends how you are looking at it.

Does it make a difference that needs to be corrected by the user of the tire under normal use? No,, probably not.

Does it make an Absolute change in pressure whether the tire is loaded down with weight or not ? Absolutely. If it did not, then adding more and more weight would not cause you to exceed the load capacity of the tire.
By pressing down on the tire you are reducing the internal volume of the tire. The air must go somewhere. It gets compressed. When compressed the tire pressure goes up.
 
Hoople said:
It depends how you are looking at it.

Does it make a difference that needs to be corrected by the user of the tire under normal use? No,, probably not.

Does it make an Absolute change in pressure whether the tire is loaded down with weight or not ? Absolutely. If it did not, then adding more and more weight would not cause you to exceed the load capacity of the tire.
By pressing down on the tire you are reducing the internal volume of the tire. the air must go somewhere. It gets compressed. When compressed the tire pressure goes up.
Click to expand...

HMMM, the dynamics of physics, I like this:s
 
You check it while on the ground, do you think the tire manufactures expect you to lift your ride each time you check the air pressure? LOL! Not saying it makes any difference....... ground or on the jack.
 
Jack Klarich said:
HMMM, the dynamics of physics, I like this:s
Click to expand...

Good point. Some people will also argue this fact. If you were to remove the tire valve from a rim and let all the air come out of the tire, how many pounds of air pressure will remain in the tire.

An everyday person will say Zero.
A Physicist would say 14.7 lbs.

Who is correct?:)
 
Hoople said:
Good point. Some people will also argue this fact. If you were to remove the tire valve from a rim and let all the air come out of the tire, how many pounds of air pressure will remain in the tire.

An everyday person will say Zero.
A Physicist would say 14.7 lbs.

Who is correct?:)
Click to expand...

Always 14.7 and while we are here try balancing a half flat tire and see how well that works, if i catch my guys doing that they go home for the day:p ever wonder why when you go to air up a real low tire why it takes a bit for the compressor to catch up to that 14.7 psi HMMMM
 
Last edited by a moderator:
Philosophy 101 is now over, ever check your pressure with the bike in the air and then on the ground? Your average tire pressure gauge will show the same pressure. Sure the pressure will change with added weight or temp. change but not by very much. Not enough for NORMAL people to care! Keep your tire pressure at the specks it should be and have fun.
 
You must log in or register to reply here.
Back
Top