I see a lot of threads re: replacing pads, but I haven't seen one related to life expectancy. I know there are all kinds of variables that make the question almost impossible to answer with any precision, but I'm looking for a very rough estimate. I've got a Dyna with 10K miles on it. Two calipers on the front, one rear. I ride "normal" ie. not too hard and not too easy. Pads are original. So the question is: what's a good life expectancy for the original pads, front and rear? No precision sought, just some round number, like, for example [I'm making this up] "15K on the fronts, 25K on the rear". Anyone help? Also, can anyone provide the min pad thickness at which it is time to replace?