Wore through the rear tire tread on the bike (Continental Gatorskins, 23 mm width).
The front is still OK so will replace the rear only at this time.
I have this Continental Grand Prix 4season in 25 mm width.
25 mm is a better width for general riding (more tread, more air volume, more grip/comfort without much increase in rolling resistance).
Installation instructions in multiple languages on both sides of the paper!
English portion...
Most of it is warnings!
Removed the old tire
Installed the new one. Takes about 10 minutes...