from what i understand 650c front with 700c rear cannot be used in a CTT event, only club/open events.
Last time I heard as long as the 45% rule is adhered to a 650 should be fine. I've done hill climbs on one.
Club/Open events are CTT events. It will be fine to race.
@neil-bah started
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from what i understand 650c front with 700c rear cannot be used in a CTT event, only club/open events.