Trackday, new tyre or old?

Doubt it will last a track day tbh, ruin your day if you destroy it & come off

 

Tricky one!
I guess the weather would have a bearing on it - if the tread's worn on the existing it will be an issue if it's wet, but maybe not if it's dry. I'm not an expert.
Arrived at Oulton for a track day last Tuesday with a flat rear and didn't even consider a repair - straight to the track day tyre people and had it replaced. Track days are not cheap, and always hit and miss with the weather so didn't want to risk missing any of it!
Finances obviously play a part - you could leave it to the day and if you have any concerns just go straight to the tyre man and get it replaced - I've never checked the price of tyres and it cost £165 + £20 fitting for the Raceteck K3 on the Speed - maybe it would have been cheaper elsewhere. I think there's always a tyre truck at track days but best to check before you go, and that they have your size in stock.
I was surprised to find the tyre rep at Oulton last week didn't have a paddock stand to fit a Speed Triple - he had to remove the wheel and change the tyre while I held the bike over on it's side stand.
Best of luck - and enjoy! Last week's was my 3rd track day, but only managed 5 sessions out of the previous 2 due to rain, and being only newly back to bikes have hugely increased my confidence.

 

Done a few track days myself. I'd say ride up there and then do your sighting laps. After this you're first few laps will be a bit tentative and you'll take it easy up until lunch. By them you'll be finding you're feet. This will be the time to sort your rubber out. New tyres are reasonably priced. And fitting should be only about £20 or so. There should be the option for you to buy pre worn scrubs as well as new tyres, and the scrubs should still have a nice round profile. Talk to the tyre man there, he should advise you. Not just try and take your money. Then enjoy the afternoon sessions.