16" sport tires for GPR

[jkv357]

Anyone have a clue on how to find decent sport tires for a GPR with 16s?

They are tiny - 90/90-16 front, 120/80-16 rear. I have Avon Vipers on it now, but they are too big, not real grippy, and old.

I'm not finding much in a sport tire.

Thanks!