Ideally, everything would be proportional
And that’s probably what is mostly done anyway:
– geometry often varies slightly with frame size
– some companies use additional gussets etc. for bigger frame sizes
– taller people will tend to use frames and forks with more travel and vice versa
– control points can be adjusted (e.g. lever reach)
– tyre pressure is adjusted to personal preference and that includes weight
– the same is true for fork and damper settings
– we have mentioned stems, but grips, handlebars, even saddles qualify, too(different width)
– a few people will use longer or shorter crankarms than the standard 175mm
Thus questioning 26″ as the only wheelsize and even thinking about serveral sizes to suit different body-sizes suddenly makes a lot more sense, doesn’t it?
Anyway: what about bigger front than rear wheel? Any experience?