@LorneMalvo - looks great. Nice build.
Re the tires, on my Extreme Power I find for the Corsas that 25mm rear, and 23 mm front fit just fine. My wheels are Shamal Ultra C17 so fit should be the same as your Zonda C17's. 25 mm although it clears, is indeed too close in the front.
Also, interesting that you find the frame stiff. When compared to modern frames, I don't find the EP that stiff. To me it seems to be just nicely balanced when it comes to flex, but I can definitely get the frame to twist if I accelerate.
Colnago Extreme Power WX02 - 63
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