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I think SRAM chains and cassettes are Shimano-compatible. I imagine that it'd work the opposite way too, but I'd check.

I've only got the one bike, but since I live in Ohio and we've been buried in snow and cold all but three days, I haven't really had a chance to ride. I'll be switching it out properly once it warms...

Yes, you'll wear out your tire faster. Before you invest in a trainer tire, try finding an old one that you no longer use on the road (or ask your LBS) and swap that for your current rear tire. (If...