Crank length rules different for NUACC vs. UNICON?

Barn, it looks like you are correct. I was not aware of this
discrepancy, which IMHO is a result of the USA book not being updated
recently. In IUF we changed the crank length for 20" to match up with
the Japanese rules, because a very large number of 20" racers were from
Japan.

Had I realized this earlier, I would have petitioned the NAUCC
organizers to allow the 102mm cranks for this year. But now it's too
close to competition time, and riders who have 114s and not 102s would
be at a disadvantage. So for optimum performance you're going to want
two different pairs of cranks. Or, if racing isn't that serious for
your daughter (yes her, not you) you can just stick with the 114s so
she doesn't have to adjust to different sizes.

If she's not spending lots of hours training for the races it's not
likely to make a big difference. Check the finishing times in her age
group from the last few Unicons to get a reference of the kinds of
speeds to expect.

I'll make a note of this discrepancy so we make sure it getes addressed
before NAUCC 2007!

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johnfoss

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John,

Thanks for the clarification. I will talk w/ my daughter and see what
she wants to do, but knowing her, she will probably want to be as
competitive as possible. I think by the time UNICON is over, I will
be *much* faster at changing out cranks! 🙂

Thanks again,
Scott

--
barn

Scott Barnhart
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It looks like I won't be able to do any races, since my muni (only 24" I
have) wheel diameter is over the limit. Oh well, I don't care about
racing anyway.

Regarding the inch/mm thing. I can never use metric measurement myself,
except when it comes to crank size. I have no clue what a 4 1/2" crank
is, but I immediately know how short a 114mm crank is. I can even
recognize a 150 from 165's, and I instantly know what people are
talking about when they use metric for cranks, but imperial measurement
I'm lost. What a switch.

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forrestunifreak said:

It looks like I won't be able to do any races, since my muni (only 24" I
have) wheel diameter is over the limit. Oh well, I don't care about
racing anyway.

Have you tried getting a lower profile tire for your unicycle? They
should fit the same rim and a slick tread should be better for
road/track racing

jim

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How about crank size for 24" wheels ?

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thieum

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For 24" unicycles the minimal crank length is 125mm (which is slightly
shorter than 5"😉. This minimal crank length for 24" racing unis hasn't
changed.

--
bbraf

Hasta luego,
Franz

Webmaster 'UNICON XIII' (http://www.unicon13.ch/)
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I think there should be a rule that requires 20 mm. cranks for NAUCC:p

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Jim said:

Have you tried getting a lower profile tire for your unicycle? They
should fit the same rim and a slick tread should be better for
road/track racing

Good suggestion. Also remember the offroad (MUni) events don't have
wheel size or crank length limitations. So you're good to go for any
cross country, downhill, uphill or unlimited road races.

--
johnfoss

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bbraf said:

For 24" unicycles the minimal crank length is 125mm (which is slightly
shorter than 5"😉.

This is NOT consistent with the current IUF rules (applicable to
UNICON 13), which state:

"For 24” wheels, crank arms may be no shorter than 125mm (5”)."

So the rules seem to equate 125 mm to 5", while 5" is actually 127 mm.
That means that someone who reads that and only uses imperial
measures, effectively thinks he cannot have cranks shorter than 127
mm. This could well mean an unfair disadvantage of 30 seconds in a 10
km race as compared to riders with 125 mm cranks, which is certainly
not negligible.

I have objected in the past about this discrepancy in the IUF rules
(and other similar ones) but it is still there. I would advocate the
exclusive use of metric measures in the IUF rules. If so desired by
the Rules Committee, the conversion factor could be stated in brackets
with all decimal places known, e.g. (1" = 25.4 mm).

Klaas Bil - Newsgroup Addict
--
"I'm slowly but surely stealing Wales and bringing it back to my house on the wheel, frame and cranks of my muni. - phil"

The revolution of a 125 is 1.5% shorter than the revolution of a 127,
which is negligible at our level. It's true that if you make a simple
equation you might wanna think that it leads to 1.5% more power hence a
27s advantage on a 30min long race. But all it gives you is less torque
(which on a uni leads to more speed), so it might be an advantage on
flatland, but the scenario is different when you go uphill.

Plus anybody who is serious about unicycling and who stands a serious
chance, whether he uses imperial or metric will know he can get that
125mm cranks rather than 5".

I agree with you though, using imperial system in an internationnal
federation is outdated and irrelevant, they should really drop that
reference -even though everything in a cycle has an imperial friendly
lenght (seat posts, pedal threads, cranks, rims, you name it...).

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I assume there evidently won't be any crank limitation for the Marathon,
how about the 10k ?

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I assume you're question is about the races at UNICON XIII.

The Marathon is run as a -Unlimited -race only. So no restrictions
concerning wheelsize or minimal crank length are applicable.

The 10km race is run both for the -Standard -wheel sizes (20" for U11
and 24" for 11Up) and as a -Unlimited -race.

For the Standard 10km race the appropriate IUF Rules apply and for the
10km Unlimited it is the same as for the Marathon.

So the answer is: it depends on what you are registered for.

--
bbraf

Hasta luego,
Franz

Webmaster 'UNICON XIII' (http://www.unicon13.ch/)
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Yes indeed, I was talking about the Unicon. Thank you for your answer, I
was slightly confused.

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