About tires... How do I know what 50% of tread looks like? How do I determine if my tires will pass tech?
I have stock tires (Michelin Pilot road or something? ) on my r3 for the upcoming event, which is also my first track day. The tires have about 4000mi on them...but I don't really ride hard on the street. Based on the wear indicator, there is definitely tread life left.
How does tech inspection check tire life?
Honestly, New tires are the cheapest insurance you can buy. Given the miles on the current ones you have, I' guessing they would be boarder line anyway, tread wise... but if anything, you might have worn a flat spot in the middle, messing with the tire profile. I've seen it asked on here a thousand times.... If you have to ask if your tires are ok... then go ahead and change them.
Not to mention, you can get a great set of tires with a dual compound that will give you a better feel on the bike, and give you a lot more confidence on the track.
Plus, you can always keep your old tires to put back on to burn miles on the highway later on.
But, To answer your question.... how can you tell 50% tread?.... honestly I am not sure how they do it at tech inspection.... BUT.... from what I can tell, they look at your tire, and make sure its not flat spotted in the middle, make sure its not baked and discolored on the edges, and make sure there is tread above the wear bars.
I have seen the tech guys tell people that they are boarder-line, so they can run the morning sessions... but would need a different set after lunch... or they might tell them they can run the whole day, but to get different rubber before their next trackday.
There is usually a tire guy on-site for sales and service. Not sure what size the R3 takes... might want to check before hand to make sure they carry something for that. But you can get great prices on tires and they can mount them for you there.
Hope this helps.... and welcome to the addiction.