Proposal 61: Unicycle wheel size [ Revision 2 ]
Committee: Main CommitteeSubmitted on 2017-01-04
Status: Passed on January 23, 2017
Background
Started with the Hockey trouble with 24" wheel size a discussion about wheel size definition was started which end in new names for the wheel sizes and in changing back 700c to 29 Clas and deleting BSD as size and exchange it with maximum outside diameter like any other Class already use. ALso the " will disapear while the Proposal already show that the name without " sounds a bit strange when you speak it. However, a majority want to get rid of it and if you change your mind, feel free to post it it and we maybe add it again :) The Proposal show track race rules as a sample while this size should be used in general and only in case of a different Class this should be named in the rule chapter like "beside default 24 Class wheels also 24" Muni tires are allowed in Hockey even they brake the outside diameter limit" as a sample.
This new System delete the confusion that we used names like 24" and outside diameter in mm at the same time. It also delete the inconsistence that we use sometime outside diameter and sometime BSD. It should make it more easy now for riders and hosts.
SOrry, I cant use tables here so its not that good to read as it should be.
Proposal
A new naming and some changes in the definition of 700c which is replaced now with 29 Class will be invented with this Proposal if it pass. It will affect the complete rulebook, the following old/new rule is just one sample what will be changed exactly and in the end you find the full set of wheel size definition. It should appear also in Chapter 1 under definitions.
OLD RULE:
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 Maximum Wheelsize - Minimum Crank arm length - Gearing allowed?
Standard 700c - Rim bead seat diameter (BSD) no larger than 622mm - no limit - no
Standard 24” - tire no larger than 618mm - 125mm - no
Standard 20” - tire no larger than 518mm - 100mm - no
Standard 16” - Tire no larger than 418mm - 89mm - no
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.
2B.5 Wheel Size Categories
Wheel sizes for track racing are 20”, 24” and 700c. Additional groups for 16” or other wheels can be added. When not otherwise specified, 24” 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” (or less, if smaller sizes are also used). The youngest age group for 24” wheels should have a minimum age of 0, so riders 10 and younger have the option of racing on 24” with those groups (e.g. 0-13 or 14-16). All riders in age groups with a maximum age of 10 or younger will race a 10m Wheel Walk, and 10m Ultimate Wheel, if used (instead of 30m).
NEW RULE:
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 - maximum outside diameter - minimum Crank arm length - Transmission system
16 Class - 418mm - 89mm - ungeared
20 Class - 518mm - 100mm - ungeared
24 Class - 618mm - 125mm - ungeared
29 Class - 778mm - No limit - ungeared
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.
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 less, 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). All riders in age groups with a maximum age of 10 or younger will race a 10m Wheel Walk, and 10m Ultimate Wheel, if used (instead of 30m).
Additional here is the Full Set of Wheel Class which can be placed in Chapter one under definitions maybe:
Unicycle Class - maximum outside diameter - minimum Crank arm length - Transmission system
16 Class - 418mm - 89mm - ungeared
20 Class - 518mm - 100mm - ungeared
24 Class - 618mm - 125mm - ungeared
29 Class - 778mm - No limit - Ungeared
Unlimited Class - no limit - no limit - no limit
Body
The new system makes it very clear and simple to measure if a unicycle fits to a discipline for the rider and the host.
References
Discussion
View DiscussionChange Log:
- Revision 2 changed by o.schl... (04 Jan 15:46)
I reformat it as the system drop the inserted tables
- Revision 1 changed by o.schl... (04 Jan 15:40)
Votes on this proposal:
16 out of 24 voting members have voted.
Agree: 13, Disagree: 1, Abstain: 2.