Junior Gearing

For all junior competition on the road and the track there are gear restrictions that apply up to and including Under 17 Age Categories

Rollout Distances for each Age Category

The rollout distance is the distance that a bike travels in one revolution of the pedal crank in the biggest gear available.

  • Under 9/11/13 – 5.5 metres
  • Under 15           – 6.0 metres
  • Under 17           – 7.0 metres

The rollout distance maybe achieve by blocking off the rear derailleur, however for Under 15 and Under 17 riders blocking off will only be permitted for club events.

Gearing Chart

The following gear charts shows the gearing combinations available to achieve the maximum rollout criteria.  These values are based on a standard 700C 23mm tyre.  Actual rollouts may differ depending on the wheel rim and the tyre fitted.

Under 9/11/13 – 5.5 meters

>36 x 14 = 5.40m * 37 x 15 = 5.18m 38 x 15 = 5.32m 39 x 15 = 5.46m
40 x 16 = 5.25m 41 x 16 = 5.38m 42 x 17 = 5.19m 43 x 17 = 5.31m
44 x 17 = 5.43m 45 x 18 = 5.25m 46 x 18 = 5.36m 47 x 18 = 5.48m
48 x 19 = 5.30m 49 x 19 = 5.41m 50 x 20 = 5.25m

Under 15 – 6.0 meters

39 x 14 = 5.85m * 40 x 14 = 6.00m ** 41 x 15 = 5.74m 42 x 15 = 5.88m
43 x 16 = 5.64m 44 x 16 = 5.77m 45 x 15 = 5.90m 46 x 17 = 5.68m
47 x 17 = 5.80m 48 x 17 = 5.93m 49 x 18 = 5.71m 50 x 18 = 5.83m
51 x 18 = 5.95m 52 x 19 = 5.74m 53 x 19 = 5.86m 54 x 19 = 5.97m

Under 17 – 7.0 meters

39 x 12 = 8.82m 40 x 12 = 7.00m ** 41 x 13 = 6.62m 42 x 13 = 6.78m
43 x 13 = 6.94m 44 x 14 = 6.60m 45 x 14 = 6.75m 46 x 14 = 5.98m *
47 x 15 = 6.58m 48 x 15 = 6.72m 49 x 15 = 6.86m 50 x 15 = 7.00m **
51 x 16 = 6.69m 52 x 16 = 6.82m 53 x 16 = 6.95m 54 x 17 = 6.67m

* Recommended as Road combination
** Rollouts this close not recommended unless 20mm tyre used