Tyre size

[Jwrat32]

Hi my car runs different tyre sizes front and back,and I'm worried that it might affect the quattro system
Back tyre sizes 255/30/19
Front tyre sizes 225/35/19

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[joinerman]

Not sure but you have a rolling radius difference of 1.41 cm

 

[Jwrat32]

Would I get away with running a 235 on the front as I'm not a fan of the stretched tyre

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[joinerman]

That would give a rolling difference of 0.57 cm

 

[Jwrat32]

Is that good or bad? I have no clue about rolling radius

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[joinerman]

Sorry got that wrong, should be 3.61 cm, so making it worse.