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The fastest bar position is the one that puts you into your optimum postion (but you already know that ;) )
Independently though, either separating the extensions from the base bar by 50+mm is probably a good thing for getting smooth flow over the base bar though, or completely integrating them both for minimal frontal area. A middle ground of 20-35?mm spacers is probably going to have the worst of both worlds.
Bottrill changed down a frame size and added stack last year and he probably didn't do it to make himself slower.
Anyone have the skinny on which bar setup is 'likely' to be faster? (Yes, yes I'll need to test it)
Slam the stem and jack the pads/extensions up with spacers (seems on-trend with Sky, etc) or my current setup which has a higher stem and the base bar close to the extensions/pads?
Assuming the trendy way is faster the only disadvantages I can see are potentially slightly wobblier pads and the brakes are a bit further away (only 20mm though, I'd guess).