Does anybody have these?
For the past 2 1/2 years I have used gray nylon knobby tread tires on my PC. Tuftec no longer caries the gray nylon 16 x 4.00 - 8" knobby tire.
The more aggressive ones left are only black rubber.

I am afraid the black rubber ones will leave marks on my painted concrete floor. Of course the gray ones never left anything.
Also my tires are filled with some type of yellow foam.

What do you think?
Thank you.