newportvelo

In English speaking countries cycle gearing is usually measured in inches and comes from the olden days of penny-farthings. A larger number means the gear is harder to push, and a smaller number means the gear is easier to push.

Category RACING TRACK CHAINRING SPROCKET ROLLER RACING
Youth A - under16 6.91M/ 88.7inches 49 15 7.93M
Youth B - U14 6.45M/ 81inches 48 16 7.40M
Youth C - U12 6.05M/ 76.2inches 48 17 6.94M
Youth D - U10 5.40m/ 68.3inches 43 17 68.3M
Youth E - U8 5.10M/ 64.5inches 43 18 5.10M

Measurement = Number of teeth on chainring x diameter back wheel  
  No. teeth on sprocket

Note: These gear restrictions apply to riders in all events irrespective of the gearing used by riders from other categories in the same event.