• "Mwoah" - Kimi Räikkönen

# Cars Tyre sizes into Assetto Corsa

Discussion in 'Assetto Corsa Modding Discussions' started by ltcars, Jun 1, 2017.

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1. ### ltcars

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If I search tyre sizes at Google, I usually get a result like this:
245/45R12 98

WIDTH=0.245 I know what to do for this but the rest...

2. ### garyjpaterson

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Just a bit of maths, should be easy enough.

45 - profile height (as a percentage of the above tread width)
R12 - rim diameter (inches)

You know the rim radius, thats 12 inches divided by 2, then converted to meters (google will do that for you). Though make that 13/2, because AC suggests adding 1 inch...

Or you can set up a wee formula in excel to do it for you

WIDTH=0.245

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Thanks a lot

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4. ### Stereo

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You shouldn't include the extra inch in the overall radius though, since it represents the lip of the rim that extends out past the bead. I know your numbers don't, just worth being clear. The rim radius is used for popped tires to say where the car'll ride on its rims.

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5. ### Willy Wale

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Not sure if it matters in AC but the geometric radius of the wheel/tyre is different to the dynamic (wheel centre to ground) radius because the weight of the car squashes the tyre.

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6. ### Stereo

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Use the geometric radius in RADIUS=, then adjust the spring rate and spring rate change w/ pressure until the dynamic radius is ok.

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7. ### garyjpaterson

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Yep I should've clarified that, i never even thought about it.