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| As you checked with the StVA/SAN, and I assumed you stated No. 18 Stammnummer or No. 24 TG-Number, it is what is stated in the cars CoC and is what the manufacturer has considered as good enough.
Here a little exercise for you: Try to find this information for your car. Have fun if it is not US import.
The information is normally only found on the cars CoC. In EU countries it is often also mentioned on the cars registration paper. In Switzerland unfortunatly not. If you do not find you can get an extract from the Swiss type apporval database TRAGA which is available from your local garage, tire dealer or StVA/SAN. See example here: https://www.targatyre.ch/ | |
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You can also go the easy way: find your car on Reifendirekt. It provides compatible tyre sizes including load index.