im now strongly considering the pana 4s but it only comes with summer tires and i want all seasons. not interested in snow tires either.

dealer says they will pay for a swap but there are no all season tires in exact sizes of 255 45-19 and 285 40-19.

best i could find is from amg 550 which has 255 40-19 and 275 40-19. rear diameter is almost the same so no problem but front would be 1" smaller. i realize speedo will be off (which way?) but dont care too much about that. more worried about abs, tc, esp which would be significant for safety.

anyone know what happens if the front tire diameter changes by an inch?

 

just found out 20" stock sizes are 255 40-20 and 295 35-20.

exact all seasons available for rear but for front only either 255 35-20 which is 1" smaller diameter or 275 35-20 which is 1/2" smaller but 3/4" wider.

thanks for advice