Not a Defender specific question, but for those going from the factory 285/60R18 to the slightly larger 285/65R18, do you notice any weird or quirky shift point behavior? Like the truck is not in the power band, or is hunting for the right gear?
On my 80 series, I went from 285/75R16 to 315/75R16 and it was fine. But when I went to 295/75R16 it seemed to have trouble finding what gear to be in, and it was often not in an optimal power band for the speed I was driving.
I think I want to get something smaller than the 275/70R18 I am using now but feel the stock size isn't going to be big enough. The 285/65R18 may be what I end up with but want to make sure there aren't any driving or shifting issues with that size.