Originally Posted by
chas58
UCI rules do not limit the tire width For CX races for anyone I know. But then again, we are not competing at a national level. CX is casual fun. We CX with mountain bike tires if we want.
The rules do limit tire width. Local promoters (and non-sanctioned races) may not enforce the rules. As of 2014, max tire width for sanctioned races is based on rider weight. Most racers still fall into the 33 or 35mm limit, but clydes can go as big as 40.