My favorite is the D. Strada, since they tend to be cheaper than a Z6 or Roadsmart or P. Road 2 but wear just as well and handle really well and are plenty stiff in the sidewall for 500-lb bikes and stick plenty well for 75-hp bikes. I pair them with a front that is 2-3 steps stickier, such as a D. Rosso or D. Corsa III, which gives me an extry margin of stick at the front should I need it for cornering or emergency braking in a corner, and I just accept that front and rear tires will need changing at the same mileage. For me, this is typically 8,000 miles.