the number of skid patches isn't going to affect the easy/difficulty of skidding, just the resultant tire wear. skidding difficulty seems contingent upon two things -- difficulty of your gearing ratio, and, not unimportantly, the friction coefficient of your tire to the surface you're riding on. that is, looser or wetter surfaces (or frozen) will be easier to skid on. also, the slicker your tire, the easier it will be to initiate a skid. i had this michelin axial pro on my gitane's rear wheel for a little while, and i lost traction a few times just mashing up a paved hill.