Speedo with Track wheels and tires
 

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.
:confused: :confused: :confused:

Just keep the overall tire diameter as close to stock as you can and you won't encounter any issues. Go up in width and shorten the profile ratio, that sort of thing. There are calculators online to help you with the math if you need them.

If the change is too much from stock, it will confuse the car and you won't be able to drive it on the track. There is already plenty of discussion about this on the forum. I recommend you search.

Don't worry about it. Just worry about keeping your tire height between front and rear within 3%. I track and DD with 345's. There isn't much difference between the speedo and my gps. :driving:

last time i plugge it into a calculator my 275/35/18 setup changed the speedo reading by less than 2mph at 60mph....

or here plug yours in and see

https://www.willtheyfit.com/index.ph...0-5&offset2=15