Speedo with Track wheels and tires

PotatoSalad!

Hey everyone, I am currently looking to invest in some wheels and tires for the track specifically. What came on my base model is 225/50/18 front and and 245/45/18 rear. I am seeing 275/35/18 square from a lot of posts on this forum but am curious about the change in my speedometer read out. I know it isn't a HUGE change but it does seem like it will be off enough to bother me. I know I'm not looking at the speedo much while I'm on the track but should I be worried about the car not liking the change? Is there a way to re-calibrate the readout? Do I need to just not worry about it while I'm at the track because I will be swapping to different wheels and tires when I drive it back home? Anything helps I'm new to the road racing scene and just trying to learn as much as I can before I start spending money on the wrong things.