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The question is - would anyone be interested?
To engage the maximum number of participants, put up as few hurdles as possible. Limiting the gear to 72" is already a barrier to entry, especially if single chainrings make a comeback and people start riding TT bikes with a bottom gear of >72" again :-)
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I'm sure this is correct.
In our case the original suggestion was for a medium gear 10, but personally I think a 25 without gear restriction would be more interesting, although there's no reason not to have both.
My own 25 pb was done on a bike with a bottom gear of 86" - not ideal for riding to the start of the H25/2.
I don't think there's any question of 'making' teenagers acquire special bikes; I don't imagine for a moment that very young people are likely to be interested in this proposal.
The question is - would anyone be interested? And it seems that one or two have at least some enthusiasm for this project.
We're only talking about club records, We don't need to be too scientific about things - there's no standard engraved on stone tablets. To make this work it's just necessary to understand the spirit of what's intended. In our case, if there's a dispute, it would be up to our committee to adjudicate on the machine in question.
Just to cover some small details: while it might be interesting to specify that riders should wear alpaca jackets* since, to my knowledge, none exist in wearable condition this is a non starter. Similarly, we do not intend to insist on toeclips and straps, because of the difficulty of finding suitable shoes to go with them. The main thing is practicality.