Can someone clarify this:
8.2.1. Number Plates: a) A front number surface must be centered on the front of the bike. Side number surfaces must be located...on each side of the tail section
I've seen lots of bikes, both expert and novice, that have the numbers on one side of the ram air intake. I've also seen numbers centered on the tail rather than on both sides - as though to be read by standing directly behind the bike, not on the side. No, there weren't additional numbers on the side fairings or belly. I won't even ask about what seems to be a very liberal interpretation of the "sans serif" font.
Is number on the front legal if off to the side?
It is a challenge to describe in text what can be obvious in person which is part of the reason why the rule is convoluted.
The basic idea is this:
From front and the sides, can you identify the bike and its number from about 75 feet (a typical corner worker station). Can the numbers be read easily? Is it obvious that the rider is a white or yellow plate? Is there any confusion in the numbers or are they easy to make out?
Speaking as a sponsor who makes number plates for AFM (SeriousRnD):
We have been working with AFM tech for the last year or so and have done plates for most of the race bikes out there. If your plate does not fit in the center then you should have two on the front.
If your tail is not tall enough to be read from the side at 75 feet then you should put them on the belly or another place on the side that can be seen from 75 feet and is not obscured by the rider.
The tail to belly rule just started in 2015 so a lot of bikes got grandfathered in from previous years. Best not to rely on that grandfathering going forward.
Tech in general does not want to block you from racing because your font is not perfect so you see photos from rounds where people were given a warning, etc. I would not be surprised to start seeing fines in the coming years for people who get a warning and then ignore it.
Personally I would rather not risk getting fined or blocked from racing just to have my numbers look extra cool...