I have used the S20, 21, & 22’s on my bikes since they came out, for a sticky street tire they perform well over varying conditions and temperatures. I can’t say how they do on an FJ/Tracer 900, I don’t own one yet, I joined the forum to learn and gain info on this bike as it will probably be my next bike. But on a 2011 Daytona 675 and a 2017 FZ 10, and my riding style a rear lasts about 3k miles, you could do 2 fronts to rear but I usually change tires in pairs, I’m fortunate in not having to pay for mounting and balancing, I have access to a NoMar changer setup. I also have a cast wheel Tiger 800 with a 19”F and 17”R and run sport touring tires that are available for it, I liked the Metzeler Roadtec 01’s and Continental RoadAttack 2 EVO, and mileage is 6-7k miles per set, but I’m hard on tires. Most riders should get better life out of tires than me.