 Stock Tire Diameter |
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| mmascari |
 Oct 25 2017, 11:50 AM
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#1
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Member  Group: Members Posts: 321 Joined: 1-September 14 From: Concord, CA Member No.: 17,850 Region Association: None  |
Can someone please tell me what the stock tire diameter is? I read it somewhere but can't find it.
Also if I run 16" wheels what is the typical tire size that would put it at that same diameter? (50/55/60 series tire) I want to keep the gearing/speedo/odometer accurate. |
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| dcecc1968 |
Oct 25 2017, 12:21 PM
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#2
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Member Group: Members Posts: 251 Joined: 31-December 12 From: Concord, NC Member No.: 15,313 Region Association: South East States |
Try this link. I couldn't get it to work because my java is out of date, but it used to work.
http://www.914world.com/specs/tirecalc.php |
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| Elliot Cannon |
Oct 25 2017, 12:26 PM
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#3
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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25 inches??????
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| Racer |
Oct 25 2017, 02:23 PM
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#4
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
its about 25"..
A 155/80-15 was 24.8" A 165/80-15 was 25.4" A 185/70-15 was 25.2" A 205/55-16 is 24.9" * of course, you assume your speedo was "accurate" to begin with. Most of the time they register a little high compared to modern GPS systems. Here's a calculator for you: https://tiresize.com/calculator/ |
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| mmascari |
Oct 25 2017, 02:55 PM
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#5
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Member Group: Members Posts: 321 Joined: 1-September 14 From: Concord, CA Member No.: 17,850 Region Association: None |
QUOTE(Racer @ Oct 25 2017, 01:23 PM)  its about 25".. A 155/80-15 was 24.8" A 165/80-15 was 25.4" A 185/70-15 was 25.2" A 205/55-16 is 24.9" * of course, you assume your speedo was "accurate" to begin with. Most of the time they register a little high compared to modern GPS systems. Here's a calculator for you: https://tiresize.com/calculator/ Awesome thanks! I guess I will have to buy new tires because I have 50 series. I want to be able to cruise on the freeway without the revs being high |
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| Racer |
Oct 25 2017, 03:52 PM
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#6
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
A 205-50-16? its only 24.2" or then again you might not notice as its not a huge difference. You might notice improved acceleration. Using the calculator, only 30 revs/mile more than a 205-55-16. I don't think you should worry about it imho. Then again, I've run everything from a 165/80-15 to a 185/70-15 to a 195/60-15 to a 205/50-15 to a 195/50-15 and even a 195/60-14. Only the 195/50-15 was truly horrible on the highway. The rest were/are all quite reasonable.
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| porschetub |
Oct 25 2017, 10:57 PM
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#7
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Running 205/50 very close % wise,good width ,decent sidewall height but won't ride anything like the original....
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| DRPHIL914 |
Oct 26 2017, 08:47 AM
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#8
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Dr. Phil Group: Members Posts: 5,766 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(Racer @ Oct 25 2017, 04:23 PM) its about 25".. A 155/80-15 was 24.8" A 165/80-15 was 25.4" A 185/70-15 was 25.2" A 205/55-16 is 24.9" * of course, you assume your speedo was "accurate" to begin with. Most of the time they register a little high compared to modern GPS systems. Here's a calculator for you: https://tiresize.com/calculator/ I'm running 205/55 16 and my Speedometer is off by 5mph, and calculated this to be one size too big- a 205/50 would be 24.2 and would be right on according to the calulators. - maybe my speedo is off? the car had really small tires on empi 15" wheels when I bought it and it might be that the p.o. regeared the speedo. |
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| Racer |
Oct 26 2017, 02:12 PM
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#9
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
Its a bit unlikely someone re-geared the speedo... to much of a hassle imho. Glad your on the path to a tire size you want!
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| larryM |
 Oct 28 2017, 08:58 PM
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#10
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California
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use this calculator http://www.rimsntires.com/specspro.jsp i run 225-50x16 on 7's, and they are almost perfect match to the oem 185-70x15's |
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