The rim size of the SL 9 inches
The Standard model is 9 1/2 inches
I understand that they trying to keep down The difference in the overall diameter, but why in the width ?
They could've went with a 30 instead of the 35 or less and keep The same diameter so a wider tire would fit!!
BTW on a 9 inches you can fit up to 275 wide
Firestone has an existing tire and I'm sure other companies has the same tire size as well.
/fire heart/ 275/35r20
And you can go with the 30 instead of the 35