I'm pootling around on a bike with drums front and rear with no real worries. They probably need attention a little more the disks, by that I mean adjustment (not a hard thing to do) and I go over the bike when doing an oil change (2000ks in my case).
If anything is going to let them down its probably the cable being stretched but they are only around $35 or so to replace, and an easy job.
"Your talent determines what you can do. Your motivation determines how much you are willing to do. Your attitude determines how well you do it."
-Lou Holtz
Bookmarks