Originally Posted by masi61

Just curious if anyone knows if the holes for the “B” pivot spring can be adjusted for crisper upward spring of the upper pulley to help the RD to more tightly wrap chain on a triple chainring bike while in the small chainring in front. I am running a road triple with a 9 speed “racing” 12-23 cassette. I had an upper “B” pivot bolt that had gotten almost seized up so I worked on it and it now pivots easily. Problem now is that when in the 30 tooth front chainring and climbing, the chain is wanting to come off the cassette cogs when under torque.

I have checked into a lot of different contributing factors and I am still a bit baffled. I’m thinking I might be able to wind the B spring a bit tighter by using a different hole in the end plate but I don’t know which is which so this may be a bit of trial and error. I plan to back out the B screw some more to help the upper puller come up tighter for more chain engagement.

The other thing I plan to check is cassette cog wear using a Rohloff HG cog wear tool.

Thanks in advance for any comments folks might want to add about this….