Oem D.I.D got me 21000 miles, RK replacement got 23,000 miles so I'm on my second RK. (Speedmaster with 16t front sprocket)
I clean and lube (chain wax) my chains and I don't change the sprockets unless it's worn out. Or to change size of course; in fact I may get a few less miles on this set since I went to a 44 rear with the 16 front.
