Just made an observation today. It's been cold and I just haven't noticed. My wife's 1999 335 Sportsman has rear axles about an 1" 7/8 in diameter as compared to maybe 1/2" on my 2013 500HO Sportsman. If there is any logic to this please feel free to chim in. Only thing I could think of was Polaris figured it was better to twist off an axle verses busting something in the rear end due the the strong axles. IDK need help on this one. I hope it ain't for Polaris to save money skimping on the smaller axles...