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Discussion Starter #1
Have a 2015 M3 5 door IGT and want to switch out the original 16" set up for 18" combo.
How do I get the computer to learn the new size?
Anyone know?
 

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there isn't an option for that.

Just make sure you get the correct tire size.

for 18" it should be 215/45R18 or 235/40R18.

Keep the rolling diameter (tire & rim) the same as stock and you should be good to go.
 
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