225x35x20 = + 11mm raise over std (235x45x17)

245x35x20 = + 18mm raise

255x35x245 = + 21mm raise

245x45x17 = +4.5mm raise

This was calculated not actual.

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are you talking about how much it affects the overall hight??

If so how dose a 245 tyre raise 18mm and the 225 raise 11mm?? it should be the same, as that is the width of the trye and would not affect the overall hight.

Edited 05/01/07 02:52 AM05/01/07 02:52 AM by ypurv4

calculated not actual. but I do refer to overall height gain.

Here's a quick example.

overall diameter of a 245x35x20 = 26.75 inches 245x0.35x2, then divide all by 25.4, then add 20" = 26.45

overall diameter for 235x 45x 17= 25.33

therefore 26.75 - 25.33 = 1.42 then x 25.4 = 36.07mm

then divide by 2 to get height difference = 18mm

correct me if I'm wrong guys

225x35x20 = + 11mm raise over std (235x45x17)

245x35x20 = + 18mm raise

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I was just talking about this, there both going to be the same hight there both 20 inch with a 35mm profile so the over all hight will be the same.

The 225 and the 245 are the width which wont affect the hight.

I was just talking about this, there both going to be the same hight there both 20 inch with a 35mm profile so the over all hight will be the same.

The 225 and the 245 are the width which wont affect the hight.

that is not correct.

the profile of a tyre is a percentage of the width of the tyre.

example

225 = width of tyre / 35 = hight of the side wall as a % of the width / 20 = rim size in inch's.

so therefor if you keep to the 35 series tyre you will effect the overall hight of the tyre by increasing or decreasing the width of the tyre.

you follow??

the profile of a tyre is a percentage of the width of the tyre.

spot on!!

I think you will find that their rules are the same rules that govern ALL cars.

I actually thought the min height was 110mm. 

I do not know how anyone could drive a car that low and not hit driveways, speedhumps and dips on the road.

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Didnt you need to raise the F6 to get in the driveway Mal?

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Yep, it is 15mm above standard F6 height.

I have sold my house, so it will be back to stock height very soon.

I was just talking about this, there both going to be the same hight there both 20 inch with a 35mm profile so the over all hight will be the same.

The 225 and the 245 are the width which wont affect the hight.

that is not correct.

the profile of a tyre is a percentage of the width of the tyre.

example

225 = width of tyre / 35 = hight of the side wall as a % of the width / 20 = rim size in inch's.

so therefor if you keep to the 35 series tyre you will effect the overall hight of the tyre by increasing or decreasing the width of the tyre.

you follow??

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So if I have my 225/35 on the front and my 245/35 on the back are you saying my back rims are taller than the front if you place them side by side??

try this link for tyre size and rim calculations,

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

it will give you all you need to know about tyre sizes and rim sizes

I was just talking about this, there both going to be the same hight there both 20 inch with a 35mm profile so the over all hight will be the same.

The 225 and the 245 are the width which wont affect the hight.

that is not correct.

the profile of a tyre is a percentage of the width of the tyre.

example

225 = width of tyre / 35 = hight of the side wall as a % of the width / 20 = rim size in inch's.

so therefor if you keep to the 35 series tyre you will effect the overall hight of the tyre by increasing or decreasing the width of the tyre.

you follow??

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So if I have my 225/35 on the front and my 245/35 on the back are you saying my back rims are taller than the front if you place them side by side??

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Miata.net Tire Size Calculator

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