How many miles are you all getting out of clutch plates? Mine isn't slipping yet. I was curious. Are there 4 or 5 fibers and I'm assuming the metal plates are steel as opposed to aluminum? I try to be gentle with the clutch as there isn't a need to abuse it like a mx bike clutch. I'm pulling tall gearing and I don't want to slip in 5th when I'm riding it at speeds I shouldn't be.