The Challenge Grifo is a steadfast performer in various cyclocross conditions. The 300 TPI reinforced polyester casing is excellent for moisture resistance and durability. To produce a neutral tread state, the tread was glued on when the tire was fully inflated. The casing fabrics are woven from thread spun at the Challenge manufacturing facility.
This is your standard CX tubular. IT's a good all around tread. It's pretty at home on dirt and grass, but you'll want something more aggressive for muddy courses. Mounting can be a pain, as these tend to ride high around the valve stem, causing a hop. You have to stretch them pretty well while you're mounting them. I used two coats of mastik and a layer of Belgian tape on the rim, two on the tubular, then mounting directly on the Belgian tape after the second coat on the tubular base tape. Mounting is a huge pain but these tires are well worth it.
The biggest difference is that these, being tubulars, roll almost as fast as road tires on the road at 60tpi, much faster than the tubeless setup I was running. The lower weight and better handling and grip of tubulars make riding a CX bike a lot more fun, although you do have to be careful not to run over a bunch of thorns. If you do puncture, make sure to be carrying some Vittoria Pit-Stop or similar repair device.
These are more durable than the cotton-sidewall variants, and are pretty flat resistant. I've picked out thorns from these after rides without the tire actually puncturing, probably due to the latex tube more than anything elese. I wouldn't recommend riding them fast on rocky surfaces because the only ways I've ever killed these was through pinch-flatting on sharp rocks at high speed.
This is pretty much the standard cyclocross tubular racing tire for riders that can only have one wheelset (i.e, not a specific set of wheels for hardpack, another for mud, etc). Great choice if you can only have one that must work for every race.
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