i have nylon but iv only had them on for about two weeks and iv had no problems with them yet in my opinion is its cheaper to buy a few studs and nylon backers when they crack or break then it is to buy a new track if the studs rip out, with the nylon the backer will break before the track rips and the metal will just rip the track if theres to much stress, ur talking about the nylon backer and nut thats built in to one unit right
I've had the square nylon backers for 4 seasons now. They're turned 45 degrees so they look like a diamond instead of square. No problems so far, although I do have a couple of bent pics, probably from riding in minimal conditions.
I have the round Diamond head nylon backers by Snow Stuff. They're twice the thickness of any backer out there, and because of their head design, they also help with acceleration and braking. They work great, and I haven't had any problems with them. Much lighter than either steel or aluminum ones.
FOR the difference between aluminum and nylon you will save about 1 1/2 lbs. Iv'e neverused nylon but about half of my buddies run them and love them. I run the aluminum bent at 45 deg. Price wise they are about the same
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