I have Goodyear Eagle F1 SUV tyres on my Range Rover in 250 55 20.
The OEM tyre is Continental SportContact in 250 50 20. I actually have one unused (was the spare) but if it is an original (it may well be) then it's 11 years old and never been driven on, so I do not know if it would still be safe to use.
I recently did a 1500km trip in the car and the tyre were, generally, fine. However, I did notice that on occasion at what you might call mid speeds, the tyre would seem to grip suddenly during a turn to a greater extent than it had been. It was not violent or a cause of loss of car control or anything but just felt a bit strange.
The tyres are at the correct pressure (36).
The car is heavy at approx 2500kg and also reasonably powerful with 400BHP.
I know lots of people here know a lot about cars and tyres, so
1) does the fact that the tyres fitted are 55 instead of 50 have much impact on this (or anything else)
2) Having never driven the car on other tyres, I do not know if the steering behaviour is a car dynamic or a tyre dynamic; any ideas?
3) If I replace them with the OEM tyre at some stage, is the one I took off the spare, which still has the delivery paint on it, likely to be safe to use?