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Old 05-14-2008, 03:11 PM   #1 (permalink)
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Does rim dia. increase car height?

Im not sure if this is a dumb question or not but if i get 17 inch rims and the rims i have now are 16, will the height of my car increase by 1 inch or it stays the same? My lude is lowered 2 inches all around and it is a project just tryin to make it over the lip at the end of my driveway so im hopeing 17s will make it easier?!
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Old 05-14-2008, 03:29 PM   #2 (permalink)
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It also depends on the height of your new tires (i.e., 35/45/50/55 etc.)? I believe stock is 50 so what is the proposed height of your new tires that you will put on your new 17s?
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Old 05-14-2008, 03:33 PM   #3 (permalink)
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40
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Old 05-14-2008, 04:46 PM   #4 (permalink)
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i kinda want to know about this too... going from 205/50/16 to 215/40/17... is the car going to sit lower or higher? My guess is that by decreasing the diameter and increasing the rim size, it will sit aobut the same?
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Old 05-14-2008, 05:08 PM   #5 (permalink)
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Originally Posted by lilbill97 View Post
40
40 is a percentage of the width. so it depends on your width also.
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Old 05-14-2008, 05:13 PM   #6 (permalink)
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205/40
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Old 05-14-2008, 05:18 PM   #7 (permalink)
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Originally Posted by lilbill97 View Post
205/40
In your case a 205/40/17 WILL NOT make your car higher. Infact a 205/40/17 over all diameter is smaller than the stock 205/50/16. So you'll actually be riding lower.
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Old 05-14-2008, 06:21 PM   #8 (permalink)
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Technically, the outer diameter of the wheel and tire together should never change. If it did, you'd have to recalibrate your speedo - just ask any crack dealer pushing a caprice on 30's. Not that fixing the problem is a big deal or anything. Your best bet would be to go to a site like tirerack or somthing, and see what size tires they recommend for the rim sizes that fit your vehicle.

FWIW, I ran 40s on my 17's.
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Old 05-14-2008, 06:35 PM   #9 (permalink)
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Technically, the outer diameter of the wheel and tire together should never change. If it did, you'd have to recalibrate your speedo - just ask any crack dealer pushing a caprice on 30's. Not that fixing the problem is a big deal or anything. Your best bet would be to go to a site like tirerack or somthing, and see what size tires they recommend for the rim sizes that fit your vehicle.

FWIW, I ran 40s on my 17's.
You don't even have to go to tire rack the info is in this forum.

Recommended Tire Sizes & Offsets
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Old 05-14-2008, 06:55 PM   #10 (permalink)
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I searched both! this was my last question! but the only reason i have to use 205/40/17 is cause i have a set of new ones in the garage so i dont need or want to waste money on tires! but i didnt want to adjust the speedo!
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Old 05-14-2008, 07:44 PM   #11 (permalink)
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Tire size calculator

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Old 05-14-2008, 10:37 PM   #12 (permalink)
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But the width of the tire and size of the rim is changing so the car is going to sit lower or higher than stock. A 205/40/17 will sit different than a 205/50/16 But I'm not sure which one would make it sit higher? 205 or 215 doesn't make any difference that is just the length of the tire when you look underneath your car.
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Old 05-14-2008, 10:42 PM   #13 (permalink)
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Quote:
Originally Posted by twisterfx View Post
But the width of the tire and size of the rim is changing so the car is going to sit lower or higher than stock. A 205/40/17 will sit different than a 205/50/16 But I'm not sure which one would make it sit higher? 205 or 215 doesn't make any difference that is just the length of the tire when you look underneath your car.
I really can't decipher your post well.

yes those two sizes will make the car technically higher or lower but the goal is to get close to the stock size. If you really want to lower, you would change your suspension.

the width does make a difference because a 225/45/16 tire is bigger/taller than a 200/45/16 tire.
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Old 05-14-2008, 10:49 PM   #14 (permalink)
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Hmm never thought that.. anyway the OP wanted to know if he puts 17's on a 205/40 tire, would the car sit higher to clear his driveway more so than his 16's on 205/50. I wasn't sure what the answer would be.
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Old 05-15-2008, 02:20 PM   #15 (permalink)
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Hmm never thought that.. anyway the OP wanted to know if he puts 17's on a 205/40 tire, would the car sit higher to clear his driveway more so than his 16's on 205/50. I wasn't sure what the answer would be.
If you look a couple of posts up I already answered his question.

A 205/40/17 will sit lower than a 205/50/16. It won't be a by a whole lot but there will be a slight difference.

Using the tire calculator Solid provided.

Stock tire 205/50/16
Sidewall 4.0 in
Radius 12 in
Diameter 24.1 in
Circumference 75.6 in
Revs/mile: 838.0

New tire 205/40/17
Sidewall 3.2 in
Radius 11.7 in
Diameter 23.5 in
Circumference 73.7 in
Revs/mile: 860.0
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Old 05-15-2008, 03:43 PM   #16 (permalink)
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So how much will the speedo and tachometer(spelling?) be off?
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Old 05-15-2008, 04:54 PM   #17 (permalink)
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So how much will the speedo and tachometer(spelling?) be off?

Ok you can't be serious right? It says so on the bottom whenever you input the numbers in the tire calculator.

It tells you the speed difference in mph and %. The spec's posted will tell you the revolutions per mile difference.
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Old 05-15-2008, 05:11 PM   #18 (permalink)
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So does that mean miles will rack up faster or slower?
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-Turbo build in progress(25 psi)2.3l Turbo lude
AGP 50 trim-custom ic pipes, mani, and down pipe-HKS bov and wastegate-9:1 CP turbo pistons*(87.5)-Eagle h beams-255lph fuel pump-1000cc rc injectors- stock head- Aem Ems
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Old 05-15-2008, 07:26 PM   #19 (permalink)
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So does that mean miles will rack up faster or slower?
Look at the revolutions per mile then think about it again.
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Old 05-15-2008, 07:40 PM   #20 (permalink)
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I hate math but im guessing the miles will rack up slower!?lol
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-Turbo build in progress(25 psi)2.3l Turbo lude
AGP 50 trim-custom ic pipes, mani, and down pipe-HKS bov and wastegate-9:1 CP turbo pistons*(87.5)-Eagle h beams-255lph fuel pump-1000cc rc injectors- stock head- Aem Ems
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