Actually I have not looked at them that close. I was thinking that I had read that they need replaced about every 20,000 miles. I was simply looking online at parts tonight and was seeing all the different types and thought I should get them just to have on hand. I'll have to look for the wear marks on them.Are the pads worn to the bottom of the wear lines? Mine are still original with lots of wear left in them. And a wee bit more miles on it than yours.