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Discussion Starter · #1 ·
Hi...now ive created a thread about tire sizes before and some how wont let me open it up so i just created new thread here!

basically i bought 255/45/20 tires for the back and didnt change the front 245/45/20 due to none in stock....now i know the outside diameter is wrong and it did cause odd noise coming from underneath the car so stopped driving!! BUT now ive been told that he wont be able to get 255/45/20 till the new year and i cannot wait that long!! ...saving grace (hopefully..thats what im trying to find out) he has some 265 and 275 options available ...i need help with the profile! my rim is a 9" ...whats my best bet to get outside diameter the same or ok so that it wont screw up my TC

Please need serious help with this
Thanks
Scott
 

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Most run a 275/40/20 on the 9" rim, if you are putting the same at all four corners it'll be fine

But if you are running a different width front to back, like stated you need to do the calculation to determine its within a safe differance

Edit: Looks like a 275/40/20 might be pretty close to your 255/45/20
 

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Discussion Starter · #4 ·
Try this tire calculator to figure what will work. You want the diameter and circumference to be within 3%.
http://www.miata.net/garage/tirecalc.html
first off thanks for this site! second, when you say 3% is that where it says "non-stock tire is x.x% too slow" ?? because when i put in my 245/45/20 - 255/45/20 (which ive at the moment) it says 1.2% ??? very confusing tbh as ive never really understood wheels tires etc;
 

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Discussion Starter · #5 ·
oh hang on...it says "too slow" for my current set up ...and for 255/45/20 - 275/40/20 "too fast" ....right i think im kinda getting it, so it must be within 3% "too fast" ?
 

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Ill see if I can figure it out for you but I need to know what tire sizes you are thinking about using. Do you know what you have available to you? Also I would recommend keeping with the same brand if not the same model of tire if possible
 

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Discussion Starter · #9 ·
Ill see if I can figure it out for you but I need to know what tire sizes you are thinking about using. Do you know what you have available to you? Also I would recommend keeping with the same brand if not the same model of tire if possible
I do know he has 275/40/20 in stock and are the same tires! because i checked them out, so possibly them...as you said that looks like the closest....but if you able to calculate it for me and tell me what the best is....265/x/20 or 275/x/20


seriously much appreciated !!!
 

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Pull the front drive shaft or TC motor till you get the right size
 
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