My jeep is 4.5" including tires and surprisingly it runs very smoothly on highways and city roads. I'm waiting for my next tax return to put on an SYE. But for now, I've had no problems, except in windy conditions on the highway lol. I would also add in that it depends on the suspension system, tires, and shocks, as some will ride rougher than others. And some may feel too loose in steering and what not.