[nathannfm]

Last year at one of the MAR qualifiers the inspector used a metal measuring tape with the bow in it to keep it extended. When he wrapped it around our bot naturally it was way over because of the bow, so I asked him to pull it a bit tighter and jokingly said it was 112 in the CAD. after pulling It tight it was pretty hard to tell the exact size, but the tape still wasn't conforming to the frame properly so he just gave it to us.
My advice (if there is really no way to change it) would be to bring a cloth tape and pull it out if they give you any trouble after trying a metal one, no guaranty they will accept it but but be nice about it and maybe they will pass you.