What current carbon bike has the stiffest BB?
It's really not the BB that holds the stiffness, that's a bike magazine myth. it's the downtube, seattube and chainstays that flex and twist. These super oversize BB junctions on todays frames main function is to save weight. You hardly have any lever force on the BB shell.
What kind of peak wattage do you actually put out in a short sprint? And what is your weight?
If the geometry fits you, and the price fits the bill, I'd reckon a Mario Cippolini bike could be among the stouter rides out there (if it's good enough for Super Mario, it's good enough for you). But there is more to a stiff ride than the frame tubes. You really need to look at wheels, cranks, shoes and bar/stem-combo too...
Otherwise look into getting a custom steel or aluminum frame (like Tsunami), that can be tuned to your stiffness requirements just by choice of material thickness.
Otherwise look into getting a custom steel or aluminum frame (like Tsunami), that can be tuned to your stiffness requirements just by choice of material thickness.
I ride a cheapish aluminum frame, built as a criterium racer, as my main roadbike. Nothing special, but I love the geo so I can't get myself to make the change for a 'better' frame 

Velocity pride themselves of targeting stiffness before weight. That said their bikes aren't exactly heavy either.
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Stiffest bike in it's entirety would have to be the Ridley Noah.
- Ramjm_2000
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I believe both Tour and Velo gave the Cannondale Evo their highest score ever for stiffness.
- HammerTime2
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Ramjm_2000, are you confusing stiffness with stiffness to weight ratio?
Isn't that stiffness for it's weight... I have a very hard time thinking it would be stiffer than some of the sturdier frames that are twice the weight and twice the amount of the same material?
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