Tires for my wheels
#7
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Posts: n/a
Originally posted by 02BlackWRX
according to both tirerack.com and tires.com 225/40/18 is the tire you should be using to keep the same overall diameter...
according to both tirerack.com and tires.com 225/40/18 is the tire you should be using to keep the same overall diameter...
But does the 225 have anything to do with
the overall diameter. I thought (I try not to do this to much
w/car related stuff) that the 40 was the profile of the
tire and this number is what changed the overall diameter.
That would make the 225 or 215 number the width wright?
This is how tires were explaned to me. If not correct then
please set me straight.
Imprezv Jenn
#8
I <3 White Girls
iTrader: (38)
Join Date: Nov 2002
Location: Danville, CA
Posts: 26,491
Car Info: E92 M3, E70, F32, E21
the first # may be larger, the the middle number is smaller and they even out...225/40/18 = the same diameter as 205/55/16 (or whatever the factory size is)....the 225/40/18 is a little bit wider, but it still has the same diameter and thats what counts when it comes to the speedometer...and the 40 is an aspect ratio and it has something to do with the width and percentages which I am not to familiar with so I won't go into it...the 225 is the width, you are correct about that.
#9
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Join Date: Dec 2002
Location: Pleasant Hill, CA
Posts: 469
Car Info: 02 WRB Wagon (Cobb AccessPort, P7's), 2-73 914 2.0, 74 914-2.0
Here, check this out. http://www.miata.net/garage/tirecalc.html This will give you an estimated difference. To get the most accurate difference, you will have to check the specs on specific tires. A lot of tire manufacturers list how many revolutions per mile a tire turns. The RE-92's turn 830 revolutions per mile. You just need to figure out which tire you want and check the manufacturers website.
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