I had some RA3's on my Multistrada 1200S, and they were fantastic. My Zero SR has one Michelin Road 5 and one Conti RA3 due to low availability in those sizes and they've both performed great. When it comes time to put new rubber on the SS9, I'll probably go with RA4 but I could be persuaded to go with the Road 6 GT's depending on the feedback I hear. It currently has Pirelli's, which I know are good tires but the newer ones tend to have a straight section of tread that follows grooves in the road, causing a similar sensation to a loose headset. I find that feeling very unnerving and avoid the brand for that reason.