Black Accent GT 255/40-19's

[kinchy]

My GT has 255/40 19's on all four corners. I want to move to larger rear sneakers but I'm not clear how large I can go with the stock 19 X 8.5" rims?
Appreciate any insight.

Sponsored

 

[Roadway 5.0]

My GT has 255/40 19's on all four corners. I want to move to larger rear sneakers but I'm not clear how large I can go with the stock 19 X 8.5" rims?
Appreciate any insight.

Here you go: https://www.tyresizecalculator.com/charts/tire-width-for-a-wheel-rim-size-chart