3rd Gen Protege/MazdaSpeed/P5/MP3 General/Maintenance Discussion for 1999-2003.5 Models Only (BJ Chassis)

Rim Weight

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Old May 13, 2004 | 11:21 AM
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Rim Weight

Anybody on here know how much the factory 15" allow LX rims on a 2003 Protege weigh per rim without tire?

Thanks!
Old May 13, 2004 | 08:22 PM
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nope, sorry...mine came with 16s
Old May 13, 2004 | 08:34 PM
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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?
Old May 14, 2004 | 08:02 PM
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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.
Old May 16, 2004 | 12:13 AM
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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
Old May 16, 2004 | 12:36 AM
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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!
Old May 16, 2004 | 01:40 AM
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Can anyone verify the weight of the 16 inch P5/ES rim??

I heard somewhere it was 16lbs.
Old May 16, 2004 | 01:59 AM
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That is correct. Total weight with tire should be 36-37 lbs.
Old May 17, 2004 | 12:26 PM
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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>
Old May 19, 2004 | 11:12 PM
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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.
Old May 20, 2004 | 09:23 AM
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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.
hey here i didnt even get passed your sec. line, and i got smoke come out of my ears. what were you in band camp to long? there was this one time in band camp, i figured air mass vs. tirekwp[qhqgno[pqiuoh;aldkfjgpdg. lol...
Old May 20, 2004 | 09:30 AM
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Originally posted by Prote-J
...Pressurized air is heavy...But I could be smokin crack.
You be
Old May 20, 2004 | 09:36 AM
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Originally posted by gino
You be
you crack head
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