I forgot I had a pair of K70's on my P11. The rear went away so quick I forgot I had it on there. The front one literally lasted until 2020 from sometime in the 1980's. I was not riding the Norton all that much anyway since I was more into off road with lighter 2 strokes. However the K70 was on the front with a spent Avon Venom on the rear when I sold off all my other bikes and resurrected the P11. All it took to start the P11 was fresh gas and a lot of leg after sitting for 27 years. Then after getting on this site and becoming a member so I could use the search function to look for clutch ideas (mostly got crickets chirping and zero info) I found JS Motorsport on my own. I got a bug up my arse to see how much I could get out of the Norton 750 engine without making it unrideable on the street. I did it for myself, I doubt it would be considered ridable by too may other white hairs. Sucks if short shifted climbing a hilly road. Point is the rear K70 didn't last. I couldn't feel it shredding but I rode a lot in the dirt so on the street any tire kind of worked until it was worn square.
Still waiting for me to load them in to the El Camino to go to the dump/recycler.
By the way, K70's follow rain grooves because of the continuous centerline cut into the tread. Most front tires with that centerline cut tend to follow rain grooves in my old man experience. I'll insert a thumbs down for my own self.