5000 miles on my pirelli diablos

1&1/2" wide down the middle of my tire is worn down to no tread. The sides have plenty tread. I wonder if it's still safe to ride.
Time for the darkside

Darkside would probably work for you since you indicate that hard cornering is not your habit. :flower:

What is the darkside tire size?

There have been more words wasted, both on this forum and on the Brit version, about the goodness and badness of darkside tires. A good starting point might be

https://www.silverwing600.com/maintenance-tips-and-hints-f7/get-your-sumitomo-tire-for-no-shipping-cost-t1847.htm?highlight=sumitomo