Jonathan Page wrote a review of Challenge Grifo Seta 32 Tire - Tubular - 2012 on June 26, 2013
Familiarity: I've put it through the wringer
I have been racing cross for many years now and I know a good tire when I ride one. Challenge has stepped it up and is now making the best tires in the World. The silk casing on this tire had made a noticeable difference. It's incredibly supple and therefore better on the cross courses. The classic tread pattern is great for most any circuit so if you are looking for just 1 set of tires, these are your best bet. I have tested these on circuits around Europe and the USA and they have never disappointed me. These are great tires.