hi everyone. i need a wheel with a lot of traction like…enough to have it be hard to slip on like a hardwood gym floor. if there is not a wheel like that, any techniques for not slipping? 
excuse me for my ignorance…
Pull out that big flat broom that janitors use and sweep off the gym floor.
If the floor is clean almost any rubber will grip.
SLick floors need tires with lots of surface contact… this means a slick tire, not knobbies.
+1
Couple that fact with another fact which is that all your weight is on one wheel, one tyre, so friction is even greater.