Of course its an equipment change and should be listed. How come they can chart bridle changes and not sulky changes?
I said the same thing. As for the comment that it is useless in handicapping, I totally disagree. I find shoe changes, murphy blinds, hopple length & bridle changes useful but not as useful as a bike change.
And it depends on the trainer too. One of the easiest ways to stiff a horse is put him in a bike that he doesn't fit or slap on a piece of equipment (could be a shadow roll or martingale or a jawbreaker bit) that annoys him.