right size tires, for no speedo correction needed? Options

[eclipse_04a]

can someone make the list and then sticky it? it was kinda started in the 20" rims thread, but thats the info im looking for. and if you need speedo corrections, what are your options? the only one i know of is to get speed hut to do custom gauges for it.... i think this info should be stickied at the that top, and if it is, and i missed it, could you be kind enough to post a link? thanks.

[CoSo]

http://www.miata.net/garage/tirecalc.html

Standard size is:

Tyre: 205/55/R15 87V

Wheel: 7.0JJx15

This post has been edited by CoSo: Apr 16, 2005 - 11:01 PM

[jgreening]

You have to tell us what size rim you are going to use in order to answer that question.

[94GT]

Just remember, custom guages won't keep your odometer accurate. It'll just tell you your correct speed.

[Jdog1385]

if you get an 18" rim you need to get a 35mm tire. thats the highest you can go without going over the stock OD and screwing up your speedo.

[jgreening]

if you get an 18" rim you need to get a 35mm tire.  thats the highest you can go without going over the stock OD and screwing up your speedo.
[right][snapback]272667[/snapback][/right]

While this is true, its not necessarily the best advice. I would rather have my speedo, odo, and gearting be slightly off than have a bent rim from too low of sidewall. Just my $.02

[Jdog1385]

While this is true, its not necessarily the best advice. I would rather have my speedo, odo, and gearting be slightly off than have a bent rim from too low of sidewall. Just my $.02

lol, this is very tru. it depends on the condition of the roads near you and when you're going to have the wheels on the car. i only have my wheels on my car for 5 months out of the year.

[eclipse_04a]

i just want to know  what size tire to use  for speedometer to be still a bit accurate

-  15 inch rims - 195/55/15 tire size ( orginal)
-16 inch rims - ??
- 17 inch 215 /45/17 -  ?? or 205 / 40/ 17  or 205/ 45/17
- 18 inch ??
19 inch ???
20  inch ?? !!!

i have 17" but want to go for 18" so what is the tire size ??
[right][snapback]262464[/snapback][/right]

I was talking about something like this.... to have that completed. i know i cant have under a 40 series tire, and even thats on the small side for roads around here. your right, id rather have it off than risk my wheels, but id rather have larger sidewalls, the right speed, and just the OD off.....that doesnt really matter too much to me, as i dont have plan on selling the car, and it just makes it look like it has fewer miles than it really does if i sell the car later.

[jgreening]

i just want to know  what size tire to use  for speedometer to be still a bit accurate

-  15 inch rims - 195/55/15 tire size ( orginal)
-16 inch rims - ??
- 17 inch 215 /45/17 -  ?? or 205 / 40/ 17  or 205/ 45/17
- 18 inch ??
19 inch ???
20  inch ?? !!!

i have 17" but want to go for 18" so what is the tire size ??
[right][snapback]262464[/snapback][/right]

I was talking about something like this.... to have that completed. i know i cant have under a 40 series tire, and even thats on the small side for roads around here. your right, id rather have it off than risk my wheels, but id rather have larger sidewalls, the right speed, and just the OD off.....that doesnt really matter too much to me, as i dont have plan on selling the car, and it just makes it look like it has fewer miles than it really does if i sell the car later.
[right][snapback]272892[/snapback][/right]

Here is the best as far as closest to the stock OD (not necessarily for traction, wheel protection, tire availability or measured rim width):

15 inch: 205/55/15 (stock)
16 inch: 205/50/16
17 inch: 215/40/17
18 inch: 215/35/18

Hope it helps. Also, for future reference, remember this link:

Tire Size Calculator

[eclipse_04a]

thats what im saying, can we get that info stickied at the top? its useful to be able to find.... i had no idea about any of that stuff until a few days ago when i started looking for new rims and tires. if you would have asked me about plus sizing, i would have thought it was something to with with fast food....

This post has been edited by eclipse_04a: Apr 17, 2005 - 10:06 PM

[94GT]

BTW, 35 doesn't mean 35 mm. It means 35% of the width of the tire. In mm's.

[97GTinKC]

23.90" is factory tire height, so any tire/wheel combo within a quarter to half inch of that overall height will not noticeably affect the speedo. should be able to use 23.75"-- 24.25" and stay pretty accurate. may want to get it checked before buying tires, it could be off now and you could correct it with a slightly different size tire, Also consider most tires have around 11/32 or more of tread when new, so your speedo will read slightly different on worn vs new also. The factory also has a 15% margin of error to meet federal specs.

Take it to a shop that does calibration and get it checked or do it yourself with a stopwatch and highway mile markers, steady speed between markers and divide the number of seconds it takes into 3600 will give miles per hour, need a long, straight and flat section of highway to get a really good measurement, but this method is pretty accurate if you do it several times and average the results.

3rd method - borrow someone's GPS, that is the most accurate way to check actual speed.