24" parts arnt all that hard to find just a little more work my tt build uses a velocity aerohead 24" rim. Panracer still makes 24" tires and terry makes 24" tubes. All of these should be moderately easy to find online.
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Road: Quattro Assi Scandium w/ SRAM Rival and Rolf Echelon's
Mountain: 2005 Specialized Enduro Comp
2003 Gary Fisher Tassajara