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This calculator have, saying at least, "bugs". For example - tyre radius is Radius 0.315 parameter which doesn't work at all, so this value doesn't change anything. pitch and yaw inertias are the same as mass which is ridiculous. roll inertia is mass/2,5 - I had good laugh with it.
For sure, this tool is not perfect, but it exist !
About tire radius, you're 50% right, the tire radius change the final transmissions demultiplication but not the tire radius on the car.
About the polar inertia, If you look at the comment on the values, there's wrote that the inertia values are just approximated and need to be correctly filled by the user.
An inertia is impossible to get for a race car, they need to be approximated, that's all !
You don't learn me that roll inertia is not equal to 2.5 x the mass !
Maybe this is not perfect, but it's good enough for me, easy to use, funny to try. I hope one day you will be able to make the same physic creator for turbo engines and RWD, it could be great !