Ultimately, the single biggest advance made by WoundUp over other forks was the torsional rigidity of the blades and fork as a whole. Most people assume that fork stiffness is most important in resistance to lateral forces. Actually, this is not the case. Torsional rigidity is considerably more important because sufficient lateral stiffness is very easily built into a fork while torsional rigidity is not. Try to picture what lateral forces do to a fork in the real world. There, you have a front hub clamped onto the front drops keeping them parallel. With the hub in there as a structural member, lateral deflections will, by definition, force the blades to deflect in an “S” shape curve, not a “C” shape curve. What this means is that forks (in the real world) are about twice as laterally stiff as you feel when you squeeze the dropouts together. Torsional stiffness is tougher to accomplish though. The front hub, as a part of the fork structure only helps by forcing the two blades to work in tandem as they resist torsional stress.
You might ask “What torsional stresses?” Actually, torsional stresses are not all that great, but they can really cause a fork to feel vague if not addressed. Take the [competitor fork] as an example. Although it is very light and eminently comfortable, it is torsionally quite flexible. The problems develop when you put it in stressful situations. For example, hairy descents and hard criterium cornering can really stress the [competitor’s fork]…
The Wound Up is clearly a great choice for a fork when the going gets seriously twisty.
We think that’s pretty high praise. We also think we deserve it, based on the feedback of many, many other cyclists, bike shops and re-sellers who echo the Spectrum Cycles opinion.