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With the introduction of the PDX WC, tubeless tire technology for cyclocross has arrived in a big way. This is, no question, the finest race-ready tubeless tire for serious cyclocross racing available today.
The PDX WC uses the proven PDX tread pattern with tall, widely-spaced knobs that provide grip and clear mud. In the middle the knobs are setup in a pattern to roll fast. A soft rubber compound gives extra comfort through shock absorption and superior grip.
PDX WC meets the UCI tire width limit of 33mm which means it can be used at the highest level of the sport, as well as for crushing your local series.
For production of the PDX WC, Donnelly went to the Czech Republic. There are many excellent Asian-made cyclcross tires on the market, however, Donnelly wanted to bring specific manufacturing resources to these tires and therefore moved production to Europe. This tire uses the highest quality nylon casing, 240 TPI construction for a supple feel, and tips the scales at only 366 grams - this tire will save you a critical 2oz compared with the plain "classic" PDX tubeless tire.
At the casual/amateur level, generally, there isn't one. Probably the most common question asked by riders new to cyclocross is: "Can I use a mountain bike? Isn't it over the maximum tire width?" At local, casual, amateur races, the answer is almost always "yes" - bring whatever bike you have, come out, have fun, no worries about the size of your tires.
As your abilities and skills rises, however, you'll need to comply with maximum tire width rules. For the most part, this means that amateur racers never have to worry about the tire width rule - only elite riders who race at UCI-sanctioned events do. EXCEPT for national championships events. At national championships specifically, the rule can be enforced different (or not at all) depending on your race category!
There are essentially three tiers - first, the "UCI" tier which applies to Elite, U23, and Junior 17-18 riders (max 33mm), "UCI Light" (35mm), for Masters categories, and "USAC" Juniors under 16 - for which there is no width restriction at all.
SHORT SUMMARY OF TIRE RULES FOR THE CYCLOCROSS NATIONAL CHAMPIONSHIP
In case you were wondering - no studded tires are allowed, regardless of category. So if the race happens to be on snow, leave the spiked/studded ice tires at home.
ADDITIONAL FACTORS TO CONSIDER
Tires are often wider than their label, and might violate the tire width rules despite their published width. So just having a tire labeled "33" or "35" isn't a guarantee of safety. This is most common when mounting tubeless tires to extra-wide rims, which can push the width of the tire slightly out of compliance. The Donnelly PDX WC tubeless is specifically designed to be compliant on modern tubeless rims.
The gauge itself is simple - a "U" shaped wooden or plastic block with a 33mm or 35mm wide slot in the starting grid. That's easy to approximate at home, before you choose equipment and travel.
Check out the Cyclocross equipment FAQ at USA Cycling for the actual text of the rules surrounding maximum tire width.
Great communication, quick shipping!!! Thx Ride CX
Thanks for the business, Matt! Glad these are working out for you.