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@fatboyralph
there's a guide somewhere, but:
must be drops (road/track)
gear inches is up to you. im 47x14 on track (i think people at HH are usually on mid 80s to low 90s)
brakes arent allowed
not sure, but dont think a DIY track hub is allowed
RPM is the Trackies group head honcho (and resident expert on HH). he'll be with you shortly