It would be pretty hard for something to get pinned between a quality set of race rails and the bike. I mean, your fingers could get caught in there, but that is about it. I wouldnt even be too worried about it, since there are already so many other places fingers could get snagged.I've wondered the same thing. The only thing that I can come up with, is if you have a spill and some part of you gets pinned in between the rail and the bike. That would cause a horrible injury.
For the track, a crash cage will only work for a beginner at best. You can still drag knee with a cage on there(I have personally done so myself), but anything past the newest of beginners is probably getting to be too much to use a cage with, though.Thanks all for the replies. Some good pt's here. I thought the same thing about the frame sliders catching and causing more damage. I don't see my self getting down low enough to scrape the plastics. But hey, you never know..... I could see where leaning over far enough would scrape the crash cage though. I think that would be a problem. Looks like I'm going with race plastics. I was going to add a frame slider but sounds like it's better not to.
For the track, a crash cage will only work for a beginner at best. You can still drag knee with a cage on there(I have personally done so myself), but anything past the newest of beginners is probably getting to be too much to use a cage with, though.
For the street, a cage should never get in the way. If you are leaning so hard on the street that you are scraping the cage, you are riding way too hard for the streets.
Long story short, if you are going track, get track plastics(and some sliders if you want). If you are going street, get whatever the hell you want.
If only BigSheep was here. I'm sure he could engineer the shit out of an answer for you.Am I the only one that thinks attaching a steel bar to a cast aluminum frame and then expecting it not to damage the frame in a heavy crash is a bad idea.