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I asked this same question to the dealership salesman who sold me my N1K. He's a former road racer and has a lot of experience. His feelings about frame sliders were right on the borderline. Basically he said some situations they can make worse, and some they can make better. We both looked at the Kawasaki frame sliders and he said these ones leaned a little on the good side. They're beveled so no 90 degree corners to catch. They're some sort of plastic, maybe even Delrin. They don't mount directly to the frame. Rather they have a bracket that is held on by two bolts, one of which is bolted through a rubber damper. Lastly the bolt holding the actual slider in place is not a gigantic bolt. I don't know the diameter, but in a high speed crash this thing will likely snap off without inducing any angular momentum. I think the main drawback with the Kawasaki ones is the price. They were over $300.

I put a picture of the assembly in my album. Here's a link to it.
http://www.kawasakininja1000.com/fo...ame+sliders-picture1937-20160312-193822-1.jpg
 

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Hey GhostRider,

Funny you should mention the fairing. The Kawasaki frame sliders actually required a small cut in both sides of the fairing. I was a little freaked out about it, but it's in a place you never really see. That bracket would touch the fairing and push it out if the cut wasn't there. Let's see if I can get another picture up in heeya'.

There were some hash marks on the inside of the fairing to show where to cut, so it wasn't as daunting as it could have been. I cut it with a hot knife attachment on my soldering iron. For what it got me, I'm pretty happy with it.
 

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Hmm...Ishi, this seems to make sense. The fact that they use a mounting bracket should make them more frame-friendly in the event of a crash. I have the Shogun carbon finish sliders and they look awesome but are a direct bolt-on mounting. More potential for harm there.

Sato sliders also use a mounting bracket and they cost 'only' US$ 180 or so.
Yes, the mounting bracket, and the built in flexing of the bracket/damper should protect the engine/frame in the event the bike has a medium/soft hit. In a hard hit, like RC said, the bike is probably totalled anyway. I figured I had a high probability of dropping the bike sometime in the first year. I was a new rider and getting my road wits may not have come fast enough. I feel much more confident on the bike now, but I am in no rush to take these off.
 

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I notice a fault with my t rex sliders...

Strong, very strong..check.

Good material...check...

Any sort of flex, or hard hit, sends bracket into engines cylinder...check..In a slow speed hit, probably ok.

This pic shows what I dont like. I hope no one else knows the violence when a machine hits the ground. Even at 30mph, its enough to give you nightmares for years to come.
Yes, I can see that slider transferring some force right to the block. Without gloating, I should say I see why the kawasaki ones are more expensive.

When I had my first high side at flat track racing, I was really surprised by the violence of my hit. I don't think I was doing much more than 25mph, maybe 28 mph. When I got my senses I swore I had a cracked rib or something. Turns out my (rental) body armor did its job. I bought some upgraded dirt bike armor the next day. It doesn't take much for a bike fall to turn into carnage. I can only imagine how much worse a fall like mine would be with the 500lb N1K going my typical 30-45 mph.
 
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