Take your wheel off and undo the nut holding on the hub, and check the splines. Most likely if they are just starting to get worn they will still grab most of the time, and you wont be able to spin it by hand, especially if that nut is tight. It should be pretty easy to tell if they are getting worn or not by looking at the splines.
-Nick
1988 Chevy Silverado 5.9L Cummins : 1986 ATC250R : 2012 Polaris RZR 570 :
98% of Americans say 'OH $#!T!!' before going into a ditch on an icy road. The other 2% are Alaskans, and they say 'Here, hold my beer and watch this!!'