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2023_ZL1-AUTO · 03-27-2024, 06:29 AM

Thanks everyone! That's all good and in-depth info. I should have mentioned originally that my car (the tires I put on the car) will NEVER be on a track (lap tracking). I might, only ever, go to my local drag strip (straight line). I understand now that a big changes can cause drivability issues and I'll make sure to keep this in mind. I did find this that helped me understand this visually!

https://tiresize.com/height-calculator/

For instance:

305/30R20 = 27.2 diameter & Revs/Mile : 742 @ 65 mph
345/30R19 = 27.1 diameter & Revs/Mile : 743 @ 64.87 mph

I am leaning toward the R888R's or the NT555R2's. Sounds like I will be sticking to stock size. But, I would like a bit wider in the back. Seems like I would have more options if I went to 19" wheel vs keeping my stock wheels. I am going to go work with my local tire guy Nick at Discount Tire (the happen to own Tire Rack too) and will get this figured out! Thanks!

Just for reference, I took a screenshot of wheel and tire size for the 2023 ZL1 and 1Le from a GM web page:

03-27-2024, 06:29 AM	#12
2023_ZL1-AUTO Drives: 2023 ZL1 - Modified All Bolt On's Join Date: Dec 2022 Location: Columbus, Ohio Posts: 588	Thanks everyone! That's all good and in-depth info. I should have mentioned originally that my car (the tires I put on the car) will NEVER be on a track (lap tracking). I might, only ever, go to my local drag strip (straight line). I understand now that a big changes can cause drivability issues and I'll make sure to keep this in mind. I did find this that helped me understand this visually! https://tiresize.com/height-calculator/ For instance: 305/30R20 = 27.2 diameter & Revs/Mile : 742 @ 65 mph 345/30R19 = 27.1 diameter & Revs/Mile : 743 @ 64.87 mph I am leaning toward the R888R's or the NT555R2's. Sounds like I will be sticking to stock size. But, I would like a bit wider in the back. Seems like I would have more options if I went to 19" wheel vs keeping my stock wheels. I am going to go work with my local tire guy Nick at Discount Tire (the happen to own Tire Rack too) and will get this figured out! Thanks! Just for reference, I took a screenshot of wheel and tire size for the 2023 ZL1 and 1Le from a GM web page: Attached Images __________________ 2023 ZL1 Auto - CSP 2" Long Tubes by Stainless Works \| Gesi G-Sport High Flow CATs \| Stainless Works Legend NPP Axle Back \| Roto-Fab Big Gulp \| Kong NM103mm \| Kong X-Port \| Griptech 2.3" Upper \| ATI Super Damper 15% / 9.45" Lower \| TooHigh PSI Port Injection w/875cc Injectors \| E85 \| Granatelli Malevolent Coil Packs \| Katech Low Profile Billet Valve Covers \| Katech Duel Fuel Pump System \| Mighty Mouse 1000 \| DSX Flex Fuel Kit \| DSX Billet Lid \| DMS 2gal Fender Tank \| NT555R2's 305/285 \| Katech Tuned Last edited by 2023_ZL1-AUTO; 03-27-2024 at 07:04 AM.