If you're doing sprinting I'd recommend steel over aluminium even though they are 400g or so heavier. They are A LOT stiffer
On the other hand, 31.8 bars are about twice as stiff as 25.4 for the same weight, and look how long it took Nitto to spot that. Their OS bars are still poorly designed, as the diameter drops to the same as their skinny bars much too quickly. I'm a fat bastard, and I can't say I've ever been troubled by flex in my Deda Pista bars, thanks to the gradual taper on the diameter (it's almost like Deda actually looked at how structures have been designed for the past, oh, 5000 years). Of course, if you want fashionably narrow bars you're SOL with most manufacturers, so Nitto have that going for them, for the time being.
On the other hand, 31.8 bars are about twice as stiff as 25.4 for the same weight, and look how long it took Nitto to spot that. Their OS bars are still poorly designed, as the diameter drops to the same as their skinny bars much too quickly. I'm a fat bastard, and I can't say I've ever been troubled by flex in my Deda Pista bars, thanks to the gradual taper on the diameter (it's almost like Deda actually looked at how structures have been designed for the past, oh, 5000 years). Of course, if you want fashionably narrow bars you're SOL with most manufacturers, so Nitto have that going for them, for the time being.