Which Alloy is most suitable?

[Al_L_06]

I am after a new frame for racing on, and have narrowed it down to a few all alloy frames, all of approximately similar prices, unfortunately, I don't know too much about the benefits of each, and was wondering whether anyone could give me any advice? (Many thanks in advance)

They are all the same geometry, I am 75kg, and race distances between 60 - 150km over most terrains, although I do prefer rolling courses. I currently ride a carbon Trek, but fancy something a bit more direct, plus, can't quite afford another carbon frame, these are the options

Dedacciai SC61.10A
Dedacciai V107
Deddacciai EM2

Thanks again

[N.T]

Ok
Those are quality tubeset.
The EM2 should be the lightest and then the V107 and then SC61.10A.( there is differences between manufacturers)
The EM2 is the most expensive followed by the SC61.10A.
I have heared some rumours that SC61.10A cracks easily but the ride is very nice.
It goes down to what you prefer? hard and stiff or soft and comfortable.

[Al_L_06]

Thanks N.T, what about stiffness?

[N.T]

Thanks N.T, what about stiffness?

I have first hand experience from SC61.10A only. My current road frame is made from this tube set and has carbon rear end. The ride is fairly comfy for a alu frame but could be little stiffer.
I have heard that EM2 or older U2 and SC61.10A have very similar ride "feel"
and V107 being rock hard but can`t confirm this.

[rruff]

Thanks N.T, what about stiffness?

The elastic modulus of all regular aluminum is about the same, so the stiffness will only vary if the tubing size or shape changes, or if the walls are thicker... ie heavier.