Originally Posted by cyccommute
Generally speaking you are dead on. About the only thing I'd add is that you may want to the same kind of feel as if you were riding the hoods on your road bike. That's the way I have my mountain bikes set up. I like to use the same leg extention as my road bikes and about the same reach. Give yourself lots of clearance on the top tube (I ride a 23" road bike and a 19" mountain bike) and expect to see lots of seatpost out of the frame.
The 3-4" rule for clearance is about right so you will , for a roadie, finish up with a small frame. The seat post out of the frame can cause a problem and unless you are a lightweight rider, do not go for a lightweight seat post. That extra extension will put a lot of strain on a thin walled post. See attachment for what I mean. This post is not a lightweight, even though I am.
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Last edited by stapfam; 03-09-08 at 03:29 PM.