Thanks everyone, I appreciate the answers. Steve—I did consider the 13–34 and it's still a possibility, but it seems that I'd be swapping a useful gear in the middle of the cassette for the a spacer. If I add a large sprocket to a 13–28 then the large sprocket goes where the spacer would be. Plus I already have a never-used 36t sprocket on my current cassette.
I also didn't know you could re-use the pins on an 8-speed chain, that's useful info because it means I'll have a complete chain with master link left over for my other bike. Patrick—good to know that it should shift. I guess the 36t from the 12–36 9-speed is designed for shifting from a 32t, so it will have two ramps... but I don't mind how nicely it shifts, just so long as it does! I did have a look for Miche sprockets but I can't seem to find them here. Doug—the new chain I bought with the bike (SRAM 9-speed) was about 2 inches too short out of the box, and I've since checked and those chains come with 114 links (57 inches), so I think I'll need an extra 4. I measured my 68 cm Bombadil's chainstays as 47 cm, and Riv's geometry chart says Atlantis's are 44 cm on the smaller ones so I guess that's the difference. According to Sheldon's website the 36t sprocket on the 12–36 is unattached, so I should be OK. Just need to get a 3 mm spacer in there, although I may get away with the 9-speed spacer because Sheldon also says that 9-speed cassettes are spaced at 4.34 mm... I have to say I've never thought about gearing in-depth before so this may be fairly stupid. I usually just get a cassette that has the range I want and forget about spacing. But I'll give it a try, and if it doesn't work the 13–28 can go on my 1×7 commuter and I'll buy a 13–34 7-speed instead. Thanks again for the help. Tom -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/F73RiRlJnoYJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
