Hi All,
I have a 2017 Discovery V with 21" rims, currently have Pirelli 275/45 stock tires. It has air suspension, and curious if anyone has put any wider off road tires with that same rim?

 

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You can play around with tire sizes at Tire Size Calculator and select comparison.
My D5 came with the 275/45R21 and I found the ride to be harsh. I sold those and got 255/55R20 with more sidewall to soak up the bumps. I had to change the spare as well because my new tires are a little taller and the spare must match in height. I also included a pic of the sticker on my D5 that shows the various tire sizes that I assume came standard on some of these cars. I got Michelin Defenders M+S and I inflate them to "light load" on the TPS. The ride is much improved, and while they are not mud tires, they are quiet.