What bencooper & jackthe dog said. Wet enviroment not a problem but one fibre can kill you. The danger was known back in the early 1900’s but was still used in gas-masks :oops:
Was it a bit of corregated asbestos if yes then its Probs a maximum 15% asbestos.
Wash the tyre down, wash your clothes ( Don’t go into the house! …just kidding ).
If you’re hyperchondriac you’ll be worrying about something else tomorrow anyway. Eat your greens!