Last week, on my 2023 R1T, I replaced original 20” Pirelli Scorpians ATs at 21,000 miles (I drive lots of winding mountainous roads) with Michelin Defenders MS/2s and have zero regrets! The Defenders get great reviews, they are so much smoother and quieter, they should be more efficient, and...
Look at the wear bars between tred blocks spaced about every 10”. If the tred is worn down to the tred bar it replacement time. Also, I don’t think you’re supposed to ever replace just one radial tire and that they are best replaced in pairs if not sets. My 2 cents, replace them all and get on a...