A couple seasoned racers have told me that the public/citizens' race can often be more than you bargain for. After all, anyone who does not have an ACTIVE, CURRENT USCF license can register. So if you're a former Cat 2 racer who just isn't all that into it anymore and let your license lapse, it's your only choice of race. It can still happen in the 5's too, because lots of races require anyone buying a 1-day license to race in Cat 5.
The sandbagging potential in those races is apparently IMMENSE.
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"Unless he was racing there was no way he could match my speed."