Originally Posted by
Ludkeh
Today I wanted to change out the 30 tooth chain ring on my 9 speed Ultegra triple for a 26 tooth chain ring. The 26 tooth chain ring is a Sugino Brand with 74mm spacing. The switch over was uneventful, but the smaller chain ring caused the chain to catch and rub on the next larger 42 tooth chain ring pickup protrusions. No matter what I did the chain would rub ever so slightly. It seems like the Sugino chain ring needs a spacer between the ring and crank? Any suggestions? Where am I going wrong? I really want to go lower than 30 tooth if I can. The chain is a Wippermann chain.
Recommend not using the granny gear with the three smaller rear cogs! Personally I reserve the granny for use with the two or three largest rear cogs. Or am I missing something with what you are trying to do? To answer your illusion to spacing out the granny mounting a bit; yes I have done that at various times for fickle rings, expecially when not the same brand and the crankset... use or make a small washer under the ring at each bolt. Don't go to stacking up a bunch of them... you will end up wiht broken bolts as there isn't very many threads to spare on a crank bolt.