Gearing and Equipment Information

For all junior categories up to & including Junior Mens 17 (JM17) & Junior Womens (JW17), the following equipment restrictions apply for road & track competitions:

  1. For all events a standard triangular frame may only be used. Such frames shall consist of standard tubing of dimensions no more than 80mm maximum and no less than 25mm minimum. (refer Annexure 6 UCI Bicycle Regulation).
  2. For all events, wheels must have at least 12 spokes.
  3. Construction of the wheel rim shall exclude the use of composite fibres (Carbon, Kevlar, Aramid and similar fibres).
  4. Only high pressure detachable tyres and tubes shall be used. A detachable type tube means the tube is detachable from the tyre casing. Such high pressure tyres shall be beaded.

Junior Handlebars
Handlebars shall be of the standard “Classic” style. Bolt on ‘time trial’ extensions are allowed for under 15 and under 17 riders for the individual pursuit, team pursuit and road and track time trials only. No modification to the extension shall be allowed.

IMG_0399

Junior Gear Limitations
Gearing restrictions apply to all Junior category-specific races (in their highest useable gear). Restricted gearing rules exist internationally and are enforced to guard against damage to young bones and muscles that could result through the use of big gears at an early age. Gear limitations also ensure all juniors are on a level playing field as well as learn the art of pedalling. Gear restrictions are based on a “roll out distance”.

Roll Out Distance is the distance the bike travels in a straight line through one full revolution of the pedal cranks in the biggest gear on the bike.

Rollout Distances for each Age Division are:

  • U9/11/13 =  5.500 metres
  • U15      =  6.000 metres
  • U17      =  7.000 metres
  • U19      =  7.930 metres*

*when competing in junior only event, for other events U19 may use any gearing.

Parent/Mechanics are to ensure all juniors are under the gearing limit for their age at ALL events, not just junior races. If you need help please ask someone from the club before race day and they can help you out.

In addition to the Cycling Australia technical regulations, Cycling New South Wales have added the following constraint:

To restrict roll out distances mentioned above, blocking off will only be permitted by the adjustment of the derailleur or other means for:

  1. U9, U11 and U13 riders
  2. U15 and U17 riders at club events only

What this means is that all U15 and older juniors who wish to race in events higher than club level need to have a chainring and cassette combination that achieves the maximum allowable rollout distance without “blocking off” gears. This is the adjustment of screws on the derailleur to prevent the derailleur shifting into the chosen gears. It is highly recommended that the gearing combination chosen uses a cassette where the smallest cog has 14 teeth (e.g 14-25). A compact Crankset is also recommended. See below for recommended combinations.

For those new to junior cycling this topic is often the most confusing, so if you have any questions please contact the clubs junior committee via email Junior-parents@hunterdistrict.com  , or seek advice from more experienced junior parents who you may have met.

IMG_0727
Gearing Chart

The following chart gives a number of gear combinations that suit the criteria. The calculations are based on a standard 700C rim with racing type slick HP tyre. However, it must be noted that this is a guide only and the actual distance covered will be dependent upon brand and type of tyre fitted, therefore the rider must ensure compliance by measuring their own “roll-out”.

J11/13  –  5.500 metres
39 x 16  =  5.13 m          40 x 16  =  5.26 m     41 x 16  =  5.39 m
42 x 17  =  5.19 m          43 x 17  =  5.32 m     44 x 17  =  5.44 m
45 x 18  =  5.26 m          46 x 18  =  5.37 m     47 x 18  =  5.49 m
48 x 19  =  5.31 m          49 x 19  =  5.42 m     50 x 20  =  5.26 m

J15  –  6.000 metres
39 x 14  =  5.86 m         40 x 15  =  5.61 m     41 x 15  =  5.75 m
42 x 15  =  5.89 m         43 x 16  =  5.65 m     44 x 16  =  5.78 m
45 x 16  =  5.91 m         46 x 17  =  5.69 m     47 x 17  =  5.81 m
48 x 17  =  5.94 m         49 x 18  =  5.72 m     50 x 18  =  5.84 m
51 x 18  =  5.96 m

J17  –  7.0000 metres
39 x 12  =  6.82 m         40 x 12  =  7.00 m     41 x 13  =  6.62 m
42 x 13  =  6.78 m         43 x 13  =  6.96 m     44 x 14  =  6.60 m
45 x 14  =  6.75 m         46 x 14  =  6.90 m     47 x 15  =  6.58 m
48 x 15  =  6.72 m         49 x 15  =  6.86 m     50 x 15  =  7.00 m
51 x 16  =  6.69 m         52 x 16  =  6.82 m     53 x 16  =  6.95 m

Single
39 x 11  =  7.57 m        40 x 11  =  7.76 m     44 x 12  =  7.83 m
46 x 13  =  7.55 m        47 x 13  =  7.72 m     48 x 13  =  7.88 m
50 x 14  =  7.63 m        51 x 14  =  7.78 m     52 x 14  =  7.93 m
53 x 15  =  7.54 m