Crank length rules different for NUACC vs. UNICON?

[barn]

Hi,

My 9-year old daughter rides a 20" unicycle. She currently has 3.5" cranks on it for her artistic stuff. However, we need to get the right cranks for the track (racing) events for NUACC and UNICON.

I was reading what is posted on the Memphis Unicycle club's site as the latest USA rulebook (usar_final_05-16-02.pdf) and in section 2.3.2, it says that a 20" unicycle must have minimum 4.5" cranks. On the Unicon XIII's site, the IUF rulebook (iuf_rules_2006.pdf) says in section 2.2.2 that 20" unicycles must have minimum 4" cranks.

The USA rulebook is dated 2002 vs. the IUF rulebook's date of 2006.

What rules will be used for NUACC in Memphis? The 2002 USA rulebook? It seems like the USA rulebook tries to follow the IUF rules mostly, and the 2002 USA rulebook has it marked that its crank-length rules were consistent with IUF's as of 2002.

What is the definitive story?

Thanks,
Scott Barnhart
Panther Pride Demo Team parent.