Convert 12-17 to 11-27 Shimano 6600
I have a 6600 12-27, and a buddy said i could convert to a 11-27 by switching out the 12 for an 11T, and changing the lockring to an 11T lockring (the 12T lockring is to large diameter). So, I dutifully ordered up both parts, and tried to install them yesterday.
The installation went fine, but when I loaded the chain and starting turning the crank, the chain kept being picked up intermittently by the next largest cog (which is now the 13). After visually inspecting the two setups, its obvious that the spacing between the 11 and 13, is smaller than than the 12 and 13 and that is the problem. I have never heard or seen of an 11T spacer, so I am some what bewildered (I haven't talked to my friend yet). Any ideas? These are both near new Ultegra 6600 parts - a 12-27 group and a 6600 11T.