Originally Posted by
unterhausen
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Given your choices, I would definitely take 725. I would consider Ti as well, if it's in your budget. I think with Ti it would be easier to keep the rotors from touching under high loads. But there might be a comfort tradeoff. I would ask a steel framebuilder how they propose to handle this issue, and possibly modify my choice given their answer.
Thanks for the insight.
I will start asking some more detailed questions about wall thickness and how to keep the rear triangle stable without rattling my teeth out.