Rim Weight
May-13th-2004, 08:34 PM
#3
Cone Dancer
Join Date: Mar 2004
Location: Central Calif
Posts: 279
This is knot verified but someone in here said the '99-00 ES/'02-03 LX OEM alloys (15 x 6") are about 17 lbs each. If that's true it makes them about average. Not too awful shabby, but then again not excellent either. Anyone got the Real Dirt?
May-14th-2004, 08:02 PM
#4
Protege Enthusiast
Thread Starter
Join Date: Apr 2004
Location: Eastern WA
Posts: 169
Yeah I did the research and contacted Mazda. The number is approximately 17 lbs for the 15 inch. Looks like puttin on the 17's I did I have gained some rotating mass, which sucks. I will have to go out to the track this evening and see if it affects my car all that much. 
May-16th-2004, 12:13 AM
#5
2002 RX-7 Spirit 'R'
Join Date: Jul 2002
Location: Brampton, Ontario, Canada
Posts: 872
also remember that when u went bigger with the 17s Prote-J that more mass is further away formt eh centre of the rims, which makes a difference..
its like hmmm
take a baseball bat... put 17lbs on the end, and try to swing it, then u slowly move the mass closer on the bat, and u swing it, u will find it gets easier and easier, cuz the mass isn't so far away.... well thas what i think
its like hmmm
take a baseball bat... put 17lbs on the end, and try to swing it, then u slowly move the mass closer on the bat, and u swing it, u will find it gets easier and easier, cuz the mass isn't so far away.... well thas what i think
May-16th-2004, 12:36 AM
#6
Registered User
Join Date: Feb 2003
Location: Gainesville, FL
Posts: 398
VagaBond-X, you are correct about the distance from the center also playing a large factor. Case in point, my 73 Corvette I used to drive.... I upgraded to late model 17x9.5" wheels, which necessitated a 2.5" thick aluminum spacer all around. These things weighed close to 20 lbs a piece, plus the wheels were slightly heavier than the old 15's, although I noticed no difference in acceleration after putting them on. If that weight had been due to the larger rim alone, it would have had a huge effect. Then again, with over 300 ft lbs of torque at 2500 RPM, it wasn't exactly slow to begin with!
May-17th-2004, 12:26 PM
#9
Protege Enthusiast
Thread Starter
Join Date: Apr 2004
Location: Eastern WA
Posts: 169
Well it isn't affecting my overall performance as much as I thought it might. Not noticeable to me....
My tire height has not changed at all, it actually came down a little with the lower profile tire, and the mass I think is more evenly distributed then before. Pressurized air is heavy and my 15 had a larger profile tire so more air mass on the outer edge, and this is a lower profile tire with less volume to fill. But I could be smokin crack. <Shrugs>
My tire height has not changed at all, it actually came down a little with the lower profile tire, and the mass I think is more evenly distributed then before. Pressurized air is heavy and my 15 had a larger profile tire so more air mass on the outer edge, and this is a lower profile tire with less volume to fill. But I could be smokin crack. <Shrugs>
May-19th-2004, 11:12 PM
#10
Registered User
Join Date: May 2003
Location: Ottawa ON
Posts: 5
Air mass in your tire is completely irrelevant...
Excuse the metric units, the mixing of units and the inaccurate numbers, all off the top of my head.
1 mol of air at Standard Temperature and Pressure =24 litres of air. Mostly nitrogen (~3/4) at 28 g/mol, some oxygen at 32 g/mol and a touch of CO^2 at 44g/mol
Call it 30g/mol.
Assume your entire wheel contains air.
Radius = 240mm, or 2.4 decimeters
Width=205mm or 2.05 dm.
2.05 * 3.14 * 2.4 ^2 = 37 cubic decimeteres, or litres
Assume 45 psi, or 4 Atmospheres.
37litres / ((24 litres/mol) /ATM) * (30g/mol) *4ATM=185 grams of air.
That's a cylinder the size of your entire wheel. There's a lot less air than that actually in your tire (much less than 10% of that)
Far less mass than the dirt your tire accumulates rolling down the road. The effect is completely meaningless.
Excuse the metric units, the mixing of units and the inaccurate numbers, all off the top of my head.
1 mol of air at Standard Temperature and Pressure =24 litres of air. Mostly nitrogen (~3/4) at 28 g/mol, some oxygen at 32 g/mol and a touch of CO^2 at 44g/mol
Call it 30g/mol.
Assume your entire wheel contains air.
Radius = 240mm, or 2.4 decimeters
Width=205mm or 2.05 dm.
2.05 * 3.14 * 2.4 ^2 = 37 cubic decimeteres, or litres
Assume 45 psi, or 4 Atmospheres.
37litres / ((24 litres/mol) /ATM) * (30g/mol) *4ATM=185 grams of air.
That's a cylinder the size of your entire wheel. There's a lot less air than that actually in your tire (much less than 10% of that)
Far less mass than the dirt your tire accumulates rolling down the road. The effect is completely meaningless.
May-20th-2004, 09:23 AM
#11
Protege Enthusiast
Join Date: Aug 2003
Location: in front of u
Posts: 77
Originally posted by Jinker
Air mass in your tire is completely irrelevant...
Excuse the metric units, the mixing of units and the inaccurate numbers, all off the top of my head.
1 mol of air at Standard Temperature and Pressure =24 litres of air. Mostly nitrogen (~3/4) at 28 g/mol, some oxygen at 32 g/mol and a touch of CO^2 at 44g/mol
Call it 30g/mol.
Assume your entire wheel contains air.
Radius = 240mm, or 2.4 decimeters
Width=205mm or 2.05 dm.
2.05 * 3.14 * 2.4 ^2 = 37 cubic decimeteres, or litres
Assume 45 psi, or 4 Atmospheres.
37litres / ((24 litres/mol) /ATM) * (30g/mol) *4ATM=185 grams of air.
That's a cylinder the size of your entire wheel. There's a lot less air than that actually in your tire (much less than 10% of that)
Far less mass than the dirt your tire accumulates rolling down the road. The effect is completely meaningless.
Air mass in your tire is completely irrelevant...
Excuse the metric units, the mixing of units and the inaccurate numbers, all off the top of my head.
1 mol of air at Standard Temperature and Pressure =24 litres of air. Mostly nitrogen (~3/4) at 28 g/mol, some oxygen at 32 g/mol and a touch of CO^2 at 44g/mol
Call it 30g/mol.
Assume your entire wheel contains air.
Radius = 240mm, or 2.4 decimeters
Width=205mm or 2.05 dm.
2.05 * 3.14 * 2.4 ^2 = 37 cubic decimeteres, or litres
Assume 45 psi, or 4 Atmospheres.
37litres / ((24 litres/mol) /ATM) * (30g/mol) *4ATM=185 grams of air.
That's a cylinder the size of your entire wheel. There's a lot less air than that actually in your tire (much less than 10% of that)
Far less mass than the dirt your tire accumulates rolling down the road. The effect is completely meaningless.
lol...
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