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Old 11-22-2004, 11:28 PM   #1 (permalink)
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question about rims and ride height

If i get 17" rims will that lift up the height of the ride? or will i just have to get lower profile tires to make it fit and that make it even? i dont intend on lowering the car...
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Old 11-22-2004, 11:32 PM   #2 (permalink)
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all your questions can be answered in the wheels & tires forum

http://www.preludeonline.com/f84/
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Old 11-23-2004, 10:35 PM   #3 (permalink)
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sorry i am still confused
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Old 11-23-2004, 11:30 PM   #4 (permalink)
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if u get the recommended sizes then ur height will remain the same....but u should still drop ur car cuz it looks cool. the recommended tire sizes are proportional to the increase in rim size. the bigger the rim, the smaller the side wall. so get the recommended size tires for stock height
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Old 11-24-2004, 06:19 PM   #5 (permalink)
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i have the recommended tire size for my rims and i still think it made my car a bit higher. i installed my new rims with my teins, and the height stayed pretty much the same, since the tiens are supposed to lower the car, i would guess the rims put it up a bit more. maybe ill compare the two rims and see if the center of the rim is at the same level.

and in addition to making your car look better, lowering your car will make your car handle better. but im not sure if its worth the risk of bottoming out and scraping. i feel the same as you. im not sure if i will be lowering my car either, its pretty damn low as is.
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Old 11-24-2004, 08:43 PM   #6 (permalink)
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^^That's exactly what I used to think......then I lowered and I was like "Damn...why didn't I do this before." You just have to be really careful while driving is all. You get used to it.......and it's better for your suspension because you won't be going over rediculous pot holes at 50 mph cuz you'll make yourself more aware of them.

I bought my rims for the reason stated. I bought them off a friend and made sure that it didn't make the car any higher by comparing them side to side. They are almost the exact same size so there is no abnormal difference in ride height and the speedo is just as accurate as with the stockers.....give or take a couple of tenths of a mph.

I know there was a calculator that gave you the exact difference in speedometer and ride hieght (sp.) but I don't know the addy. Do a search on PO and Google and you'll definitely find what you're looking for.

My tire and rim size btw: 215/40-17 on 17x7.5 rim.
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Old 11-25-2004, 01:22 PM   #7 (permalink)
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For mine, i took the 215 35 zr17 falken azenis... same height as my stock rim w/tire..
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Old 11-25-2004, 10:32 PM   #8 (permalink)
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^^ how can it be? 215/35/17 is actually a smaller tire+wheel than 205/55/15, as is 215/40/17, but not by much. Either way it makes very small difference, and likely the difference you see is all in your head.
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Old 11-26-2004, 12:29 PM   #9 (permalink)
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http://www.miata.net/garage/tirecalc.html

diff between stock and other tires.
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
205/55-15 4.4in 11.9in 23.9in 75.0in 845 0.0%
215/40-17 3.4in 11.9in 23.8in 74.7in 848 -0.4%
215/35-17 3.0in 11.5in 22.9in 72.0in 880 -4.0%
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Old 11-26-2004, 12:33 PM   #10 (permalink)
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it will depend on the tire and rim. they all have slight variations. My 215/40's were about 1/4" larger in diameter than my 205/55's (but they were worn down). A lot of it is kind of an optical illusion. The bigger rim and more open space make it look like a 4X4 if not lowered.
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Old 11-29-2004, 11:26 AM   #11 (permalink)
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i got this response from kumho.

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The first step in plus sizing is overall diameter matching, the second step is making sure the new tire carries the load.

The pressures shown as maximum or recommended are all cold inflation pressures.

The easy way to see load capacity is to look at the load index shown after the tire size:

P185/70R14 87H (OE size)
205/55R15 87V (OE Option

215/40R17 83W (Size you purchased)

The 87 and 83 shown after the size indicates max load at the maximum inflation. By looking up the recommended inflation from Honda (30 psi for 185/70R14 and 32 psi for 205/55R15) you can find how much weight must be carried by each tire. In your case it is 1110 to 1157 pounds per tire at maximum loading.

The 215/40R17 has a max load capacity of 1074 pounds at the maximum inflation pressure. You can see it its below the recommended load capacity of the OE sizes.

If you keep 44 psi in the tires, they will carry 1074 pounds of wieght at each corner. At lower air pressures the tire carries even less weight. Tires are designed to hold a certain amount of air. The air inside the tire holds the weight of the car. Hence different sizes are put on different cars. If you do not load your car to the maximum capacity you can get by smaller load tires, BUT THE AMOUNT OF WEIGHT YOU CARRY IN THE CAR IS LIMITED BY THE TIRE NOT THE SIZE OF THE CAR! When tires are loaded beyond their capacity they flex more as the tire rolls. This extra flexing causes heat that can build up to the point that it melts the rubber that holds the tire together.

For safety, the tires load capacity must match the load capacity of the vehicle. By using load and inflation charts we can calculate the psi needed in the new tires.

P185/70R14 87H at 30 psi (Honda Recommendation) carries about 1110 pounds.
205/55R15 87V at 32 psi carries 1157 pounds.
215/40R17 83W at 44 psi carries 1074 pounds
215/45R17 87W at 40 psi carries 1135 pounds

The rule of thumb is to keep the overall diameter within 2 to 3% of the OE tire size but still carry the load. Although the 215/45R17 is 3.1% taller, it has adequate load capacity for the car.

It is possible to use the 215/40R17 on your car and not have a problem, but the max load must be kept lower at a max equal to the load capacity of the tire. That is the reason for the passenger limitation. (Car makers add a reserve load of 10% additional weight to calculate the recommended inflation pressure. This allows for weight transfer when the car leans and uneven distribution within the car. This gives some leeway, but recommendations are to keep the same load capacity as the OE tire for safety.

If you carry 4 people you may exceed the capacity of the tire, making it flex more than designed to, creating more heat and possibly melting the rubber.
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