New answers tagged downhill
The accepted answer states drag does not scale with mass. Which is true. But drag does scale with frontal area. It is fair to assume the two frames are made of the same material therefore the larger frame has a larger frontal area. Rather than compare balloon and soccer ball of the same size a more appropriate comparison is two rocks of the same density ...
The best solution I found so far are chainring spacers: http://sheldonbrown.com/chainline.html
83mm bottom brackets were designed specifically for use with a 150mm rear dropout width. You would be able to shim the bottom bracket across 5mm to bring it to where it would sit on a 73mm bb to align the chain line but you would be pushing your non drive out 10mm which would have an anatomical impact on the rider. This is a significant amount of q-factor ...
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