Proposal 81: Unicycle classes for Track racing [ Revision 2 ]

Committee: Track
Submitted on 2019-05-23
Status: Passed on June 10, 2019

Background

This proposal addresses several issues from Discussions 149 and 156.

Proposal

OLD RULE: [All changes are indicated for Chapter 2 but also apply to Chapter 3. These chapters will be merged anyways.]

2B.2 Unicycles

Only standard unicycles may be used. Riders may use different unicycles for different racing events, as long as all comply with the rules for events in which they are entered.

For events divided by wheel size, there is a maximum allowable tire diameter and minimum crank arm length for each category:

Unicycle Class Max Diameter Min Crank Length Transmission
16 Class 418mm 89mm standard
20 Class 518mm 100mm standard
24 Class 618mm 125mm standard
29 Class 778mm No limit standard
Unlimited Class No limit No limit unlimited

For any tire in question, its outside diameter must be accurately measured.

Crank arm length is measured from the center of the wheel axle to the center of the pedal axle. Longer sizes may be used.

In all track racing events on standard unicycles, shoes must not be fixed to the pedals in any way (no click-in pedals, toe clips, tape, magnets or similar).

2B.5 Wheel Size Categories

Wheel sizes for track racing are 20 Class, 24 Class and 29 Class. Additional groups for 16 Class or other wheels can be added. When not otherwise specified, 24 Class is the maximum wheel size above age 10. For age groups with a maximum age of 10 or younger, the maximum wheel size is 20 Class (or smaller, if smaller sizes are also used).

The youngest age group for 24 Class wheels should have a minimum age of 0, so riders 10 and younger have the option of racing on 24 Class with those groups (e.g. 0-13 or 14-16).

NEW RULE: [All changes are indicated for Chapter 2 but also apply to Chapter 3. These chapters will be merged anyways.]

2B.2 Unicycles

Only standard unicycles may be used. Riders may use different unicycles for different racing events, as long as all comply with the rules for events in which they are entered.

For events divided by wheel size, there is a allowable tire diameter range and minimum crank arm length for each Unicycle Class:

Unicycle Class | Diameter Range | Min Crank Length | Transmission
16 Class | maximum 418mm | 89mm | standard
20 Class | larger than 418 mm, maximum 518mm | 100mm | standard
24 Class | larger than 518 mm, maximum 618mm | 125mm | standard
29 Class | larger than 618 mm, maximum 778mm | No limit | standard
Unlimited Class | No limit | No limit | unlimited

Any unicycles in question must be checked for compliance within their wheel class (wheel diameter, crank length and transmission), with the tire pressure that will be used in the race. Preferably, this check is carried out immediately before the race.

Crank arm length is measured from the center of the wheel axle to the center of the pedal axle. Longer sizes may be used.

In all track racing events on standard unicycles, shoes must not be fixed to the pedals in any way (no click-in pedals, toe clips, tape, magnets or similar).

2B.5 Wheel Size Categories

Wheel sizes for track racing are 20 Class, 24 Class and 29 Class. Additional groups for 16 Class or other wheels can be added. When not otherwise specified, 24 Class is the maximum wheel size above age 10. For age groups with a maximum age of 10 or younger, the maximum wheel size is 20 Class (or smaller, if smaller sizes are also used).

The youngest age group for 24 Class wheels should have a minimum age of 0, so riders 10 and younger have the option of racing on 24 Class with those groups (e.g. 0-8 on 20 Class, 9-10 on 20 Class, 0-13 on 24 Class).

Unless otherwise specified, it is allowed to ride in any particular Class with a unicycle that fully conforms to a smaller Class. E.g. a 20 Class unicycle is allowed in a 24 Class race.

Body

Made the allowable wheel size a range, so that any unicycle can only categorise in one Class at a time (or in no Class at all). Current exception: every unicycle falls by definition in Unlimited Class, even if it conforms to e.g. 24 Class.

Changed the rule for the compliance checking to include tire pressure, so that it corresponds to common practice.

Explicitly allows smaller Class unicycles in a race designed for a particular Class.

References

Parent discussion: https://iuf-rulebook-2018.committees.unicycling-software.com/discussions/156

Some content derived from https://iuf-rulebook-2018.committees.unicycling-software.com/discussions/149


Discussion

View Discussion

Change Log:

Revision 2 changed by Klaas Bil (31 May 16:19)

Changed the example in 2B.5 for the youngest age group on 24 Class wheels from
(e.g. 0-13 or 14-16)
to
(e.g. 0-8 on 20 Class, 9-10 on 20 Class, 0-13 on 24 Class)

Revision 1 changed by Klaas Bil (23 May 08:54)

Votes on this proposal:

10 out of 10 voting members have voted.

Agree: 9, Disagree: 0, Abstain: 1.


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