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chez_jay
jameso
I rode them, I didn't do a load deflection test. But steering and bar leverage against rider weight can all put a twist load into a frame and they vary a fair bit in stiffness there. It won't be all the frame, the whole system flexes bars particularly but from a whippy steel bike to a stiff Al frame and somewhere in between I'd say a perceptive rider can feel it. I'd agree that the finer differences would be hard to call. And I'd not be able to feel varying levels of vertical flex in a frame. I think when most people talk about what they think is vertical flex they're feeling twisting flex (or imaging the whole thing via better fit/comfort).