Originally Posted by
FastJake
That caught my eye. I have a 13T Shimano cog originally from a 7-speed cassette. It is meant to be the highest gear, as indicated by the grooves on the outside to mate with the lockring. It is very narrow, and no chain would fit between it and another cog. Thus, a 1-2mm (I didn't measure it) metal spacer was included to fit between it and the next higher cog. If you are missing the little spacer, it could give you the problem you describe.
Hmmm... 13-tooth
second-position cogs typically have an additional 1mm spacer. On the last position- nope. The last cog on a Hyperglide cassette is all one piece so it engages the cassette body correctly.
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..