245/40/zr18???
08-10-2001, 08:50 AM
#1
Moderator running more PSI than all the boosted Maximas... combined
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I have 235 on 8.5 rim right. With 245, how much will my speedo be off? Anyone have that tire calculator software that they can plug in the numbers for me?
08-10-2001, 09:23 AM
#3
here is the site
http://www.miata.net/garage/tirecalc.html
it is about 1.602115414527936 % to slow..
that site is very percise with there numbers..
http://www.miata.net/garage/tirecalc.html
it is about 1.602115414527936 % to slow..
that site is very percise with there numbers..
08-10-2001, 09:29 AM
#4
Just by diameter
From my calculation, the stock (215/55/16) diameter is 79.5" va the 245/40/18 diameter of 80.8". A difference of 1.6%. Hope that helps.
Originally posted by 1MAX2NV
I have 235 on 8.5 rim right. With 245, how much will my speedo be off? Anyone have that tire calculator software that they can plug in the numbers for me?
I have 235 on 8.5 rim right. With 245, how much will my speedo be off? Anyone have that tire calculator software that they can plug in the numbers for me?
08-10-2001, 10:45 AM
#5
Moderator running more PSI than all the boosted Maximas... combined
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Join Date: Aug 2000
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Hmmm...with 235/40/18...it's .35xxx % to slow
with 245/40/18 it's 1.6xxx % to slow.
Wow...i guess 235/40/18 is the most optimal choice. But I do want a wider tire for more wheel protection, so I guess I can live with the speedo/gear ratio more off.
Ok...245/40/18 will be my next set of tires.
with 245/40/18 it's 1.6xxx % to slow.
Wow...i guess 235/40/18 is the most optimal choice. But I do want a wider tire for more wheel protection, so I guess I can live with the speedo/gear ratio more off.
Ok...245/40/18 will be my next set of tires.
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