Hej på dej!!
Join Date: Apr 2004
Location: Utah, USA
Bikes: Ritchey Road Logic, Della Santa Corsa Speciale, Renn DeWitt Custom, da Vinci Joint Venture, Ritchey Comp All-Rounder, Rivendell A. Homer Hilsen, Crescent Professional
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I've got an IRD 12-28
I believe you mean IRD, right? As in Interloc Racing Design, like these here: http://www.interlocracing.com/cassettes_steel.html
I've got an IRD 10-speed 12-28 mounted on my da Vinci. It's the "10-speed Elite Road Conversion Cassette" type that allows for Campy spacing on a Shimano-compatible freehub. This is in conjunction with a 9-speed SRAM chain, as I have not found any 10-speed chains long enough for the da Vinci (which uses 124 links) and didn't want to purchase two and splice. I'm leery of the strength of a spliced chain. I suppose I could use two master links, but haven't gone to the trouble yet.
The only problem we've had is that two of the spacers between the cogs were too thin for the 9-speed chain. This caused the chain to rub on the next largest cog at times and ghost-shift on to it under load on occasion. I firmly believe this is caused by the 9-speed chain and has nothing to do with the cassette itself. I solved it by replacing the two spacers with slightly thicker ones. The new spacers were thicker by .05 mm (yes, that's 1/2 of 1/10 of a millimeter). Not very much difference in thickness, I know, but it's enough that we've not had a single problem in the 1700 miles we've put on the bike in the last three months.
I share stapfam's concerns about avoiding carrier-mounted cogs, which most high-end cassettes use to save weight. However, I believe that is most relevant on tandems using the larger rear cog sizes (like 32 or 34) and with strong full-sized stokers...especially off-road. Our cassette has a maximum of 28 teeth, we ride on the road exclusively, and my largest stoker just barely tips 80 pounds. Needless to say, we're not a powerhouse team. If this is a concern, you can use the Comp versions listed further down the page; just like the LX line stapfam mentions, they don't use carriers for the larger cogs.
However, in looking at the page, I don't see any 10-speed cassettes listed with cogs larger than 28. They have several 11-32 and 12-32 available as 9-speed, but not 10. Are these new cassettes that might not yet be listed on the page? Wouldn't surprise me, knowing IRD, but still curious.
Last edited by Eurastus; 09-02-06 at 07:30 AM.