I've experimented with motorcycle tires since 1975. Continental outlasted 3 sets of Dunlops. But, they are kind of a hard compound for extreme cornering. Really good wear, though. Once I tried out Metzelers, I stopped shopping for different brands. They wear well and grip well. That was 20 years ago, and I have yet to see any of them crack. I've worn some out. But, never had any sort of problem with them cracking. I also don't apply exotic chemicals to them (that can leech out the bits that keep them from cracking), either. I leave the mold release on the sidewalls and let that wear off naturally.
They are my go to brand of tire for MCs. My race days are over. But, from past experience, they provide more traction than the bike can handle. Meaning, can I scrape bits of bike in turns before I lose tire traction. That's only important to me now in case I need to do some emergency avoidance.
My last Metzeler purchase was two years ago for a 550. I went out and checked it just now. Yes, made in Brazil. And, it has no cracking on it at all.
I still recommend Metzeler. And, they still make them in the inches sizes for the SOHC4.
Cheers,