You mean either 10cm or 100mm.

I don't think you need a spacer. But they come pretty darn thin, so what's the harm?

That 9/9 combo should work fine. Sure you had it adjusted correctly? I don't know about using a 10sp chain, but I use the D/A 10sp on my Campy 10sp because it's supposedly slightly narrower (which makes adjusting it easier, plus it's cheaper and more readily available).

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I think he meant 10mm. I may be wrong, but my stem is 10cm. That would be a very long drop.

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Yeah, could've been more clear. Currently using a 10mm spacer and want to lose that entirely.

Pretty sure I had the rear der dialed pretty well, but still had lots of skipped shifts across the 3 largest cogs. I'll have a go at that again before I drop $30 on a 10-spd chain.

Hmmph. My saddle to bar drop is 12cm, I think. 10cm isn't all that far :-) But I get the point now. A 5mm spacer will make zero diff. FWIW, I had a thin plastic shim (for lack of a better term) that was less than .5mm in there. Maybe that would be what you need.

Yeah, mess with the deraileur. What you describe ain't the chain.

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Too f@ckin depressed from various injuries to care about having a signature line.

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