We all know some tires are better in the wet, possibly due to compounds &/or number of rain sipes. Regardless, if I need to swerve, or suddenly find that I'm carrying too much speed into a curve, dry or wet!, I want my tires to act as a matched unit - as intended by the manufacturer, with no surprises.
RevZilla: , "differences in tire handling and performance can cause an otherwise well-behaved motorcycle to act in an unpredictable, unsafe manner. "
Scooter tire treads, front to rear, can look very different - (as in City Grips from Michelin) You can buy one or the other.....but they are designed to be used with each other.
True, you're not going to die just because you mixed tires, but...
RevZilla knows a thing or two about tires:
"Tire manufacturers engineered their tires to work with a matched partner. You paid for all that engineering, so why not use it?"
Yes. Why not?
Stig