Know what the numbers mean
A larger front chainring or smaller rear cog generally creates a harder gear. A smaller front chainring or larger rear cog generally creates an easier gear.
Compare rollout—not teeth alone
Rollout estimates how far the bike travels per crank revolution. Tire diameter affects that distance, so compare the complete wheel-and-tire setup.
Match the rider and track
The goal is useful acceleration, cadence, and control for that rider—not copying another rider’s combination. Gate strength, track length, surface, and conditions all matter.
Document changes
Keep a simple setup record with chainring, cog, tire, pressure, track, and rider feedback. Change one factor at a time and review it with a coach.
Official resources
USA BMX New Rider Information ↗This guide is an educational starting point. Follow current USA BMX rules and manufacturer instructions, and ask a Reaper Racing coach or qualified bicycle mechanic when you are unsure.