My OEM summer tires are 305/30/20 rear and 265/35/20 front on my 2021 F-Type R Coupe. I have an almost new set of 295/30/20 rear and 255/35/20 front UHP all-seasons from my prior 2018 F-Type R convertible. Tire Rack says that the smaller size tires are an acceptable option for my coupe. Anyone disagree and, if so, why? Thanks!

 

I use the tire size calculator on 1010Tires.com whenever I'm comparing sizes. https://www.1010tires.com/Tools/Tire-Size-Calculator

 

The "smaller" size used to be OEM spec for earlier Rs - only the SVR had the larger size. If the wheels haven't changed size for the new R you should be fine with either size. Make sure the tire load and speed ratings are suitable for the new R, though.

 

Thanks. At 575 hp, mine is successor to SVR. The speed ratings should be ok.