I have heard about the screws you are talking about. From what i have heard they stay in the track pretty well and tunnel protectors vary upon the sled. I would say that the tunnel protectors are usually not needed but you need to check your individual sled to be sure. As for added traction of these things, dont expect a whole lot from them. They will help a little but, will not even begin to compare to a stud.
If you have a paddle track and have to ride icy trails to get to the good stuff these will help. Tunnel protectors are mandatory, and you will want to warn anyone on the trail following you that they may want to stay behind the windshield. They've been known to come out rather violently. I intend to put them on my sled, nothing worse than 170 hp and no traction.
Has anyone tried the new BLT lug studs they look a lot different than the old sheet metal screw type. Much longer shaft. Guess I'm going to have to try them out. Talked with a rep and he says that some people are clipping the track by a 1/4" only leaving about an 1/8" above the track for slick trail condition type riding. Does anyone have any experience with these?
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