Since my K4 with a continental on the front and a goodyear on the rear, I haven't mixed tire brands. It handled fine with either on both ends but not mixed. Not saying I won't though.
The original tire numbers are long out of production. I appreciate the guys that are running a combo that works, thanks for sharing the info. no rain grooves around here so I'll probably find a ribbed front.
I've run the chinese poppers on my car trailer, I'll try to stick to something not made in china. My parts dealer apologized for a new set of tires being made in Japan. Well duh. That's OK, so was my bike.
Keep em coming I'm still shopping.