Originally Posted by
Rolla
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.
This is not true, at least not in national or international rules. The UCI (international sanctioning body) prohibits tires wider than 33 mm for all racers. USA Cycling (United States national sanctioning body) has no restriction on tire width whatsoever. If some local association or racing series has this weight-based rule, well... that’s fine I guess, but it’s not a rule I’ve ever heard of or encountered at any race and it certainly isn’t a USAC or UCI rule.