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Did someone say "different size wheels"?
Burn the heretic! 😉
It's fairly simple that the lower the stack and the longer the reach, the more stable a bike will be under deceleration, due to the reduced moment around the front contact patch applied via the bars. However, there's a lot more to MTBing than braking - in fact a bike with shorter reach and higher stack will be easier to lift the front and therefore jump (look at DJ bike geometry!)
Yep, that's very true, though it's not just braking that improves~ it's also passing over obstacles (taking wheelsize out of equation) and high speed cornering
[url= http://www.pinkbike.com/news/GT-Fury-Tested.html ]This piece on when GT brought out the new Fury[/url] probably explains it better than I can
(look at DJ bike geometry!)
And, as a greater extreme, BMX geometry.
Steep angles, small wheels, short reach and a high stack (including the bars)
Guys
my 2c, I don't THINK this point was made above, apologies if it was.
1: IMO top tube is not a relevant measurement because 2 bikes with same "effective top tube" length but different seat tube angles differ in the vital "BB to front axle" measurement. Reach takes this out of the equation. You can't change the most important measurement on a bike, which is the down-tube length IMO. Sure, you can bugger up the handling by fitting a longer stem but that's not really an option. Given similar fork length, head tube length and head angle the down-tube measurement is a good way to compare different maker's bikes IMO. [as is reach/stack]
[down-tube means Centre of BB to Centre of lower headset race].
2: some interesting points about when a bike turns from Liteville/Syntace / Pinkbike - http://www.pinkbike.com/news/liteville-601-mk-2-review-2015.html
The argument for a 26" back wheel with a 650 front is pretty interesting. nice theory.
http://www.pinkbike.com/news/liteville-601-mk-2-review-2015.html <