i've read of quite a few trail-riding incidents where the frame was damaged, some say under 10mph, which may be stretching the truth. personally, i only know a few guys smart enough to own a can-am, :: D so i can't say i've witnessed it first hand. that being said, i have done a pretty good amount of damage to the frames on my previous quads, so i did the frame mod. once you take a look at how thin the material used for the spar is, you can understand why they are bending, approx. 1/16". it cost less than $30 for the material, took very little time to weld it and put it in there, and the added weight only helps lower the center of gravity. this way, if i nail something really hard that would've bent the frame, it will probably bend or break an a-arm mount. with the steel inside the spar, it gives me something solid to weld it back onto, the spar it self would probably blow through if i used the right setting for the thickness of the a-arm mount. bottom line is, if you don't think you ride hard enough to do any damage, you're probably fine. i'm not taking any chances...
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