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Veloflex Crits here: http://www.acycles.co.uk/veloflex-criterium-tubular-tyre-700x23-523.html
£49
I got my Veloflex Record tubs from them - good service.
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I've ridden loads of variants of Veloflex.
My first thought when I mounted the Challenge Crits (23mm front, 25mm rear) was how similar they rode. They seem to be wearing well too. So I would buy either based on price to be honest.
I'm not sure the Vittoria feel so Nice. But they do last amazingly well for a race tyre. I've been using the ones my fussy mate pulls off his Wheels when he wants New tyres. Putting my bike away after a race a few weeks back I noticed I'd basically been riding on Cotton. Cant think of many tubs I've used that have lasted Down to the Cotton. We worked out it done a good 3000km too.
I have Challenge Crits. Really like them. Seem to ride much like a Veloflex.