Rear Derailleur upgrade
I have an ultegra 6400 RD (8speed) on my road bike. Several years ago I upgraded to a 9 speed cassette with no problems indexing through all gears. However my rear pulleys are chewed up from running the narrower chain on them. I know I can get the replacement 10 tooth pulleys for cheap, but...
Does anyone know if you can put the 11 tooth (9 speed) pulleys on a derailleur made for the 10 tooth pulleys?
I know I can just get a new 9 speed derailleur on the cheap if I look long an hard enough, but the one I have is nice and it works.