BMW X5 comes fitted with run flat type tyres and that's what BMW recommends. In 255/55R18 we have Kumho K51 tyres but it has H(210) speed rating. I will recommend you to go for tyres with V speed rating. Please look for various tyre options from here- http://tyres.cardekho.com/search-tyres. If you don't want to go for run flat tyre then I will suggest you Pirelli Scorpion Verde tyre. However remember to keep emergency inflator or BMW's space saver Spare wheel in the car.
satyajit singhvia Google
Hi Siddharth, looking to change my 4 tyres in bmw 320d 2011 model from Rft to tubeless. Current tyres are of size 205/55 16. Should I keep the size same or increase to 215? Which brand would be best tyreRead More
I don't think there is any need to upsize to 215. 205 itself is quite a wide tyre. So best is to stick with it.