We had a question regarding a U17 racer entering the Junior (18-19) category (because it's a championship category and a 40 km course). This and similar category changes are allowed if you get a letter of permission from Cycling BC (contact Richard Wooles, the provincial head coach).
Youth riders are normally allowed to use the gearing of the category they are entered in (rather than the gearing for their natural age), but contact Cycling BC for the complete details.
And with that out of the way, here's a very nice video from this year's WTNC races, courtesy Jeni, the resident EV auteur. Watch it in HD, IF YOU DARE!