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C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
If you have a Zr1 and are running 18 inch rims please help me out with tire sizes. So if I get a 345 35 18 in back what size do I get for the 18 inch front ? 275 40 18 or 275 35 18. I don’t wanna throw off the car and get the service active handling crap. Wanna throw the drag radial on with front tires and go. If you have 18 s on your z show me what front tires you are using.
I have no idea. That would be one of my questions, do you specifically know that the 35s will work on all four corners without throwing my z into limp mode ? I’m trying to find out
I went and got some M/T drag radial for the rear. 305-35-20s. The Zr1 is new to me so I didn’t know that they are too tall and threw my car into limp mode. I was lucky and M/T took the tires back. I’m trying to avoid this again. The tire sizes are all new to me and don’t wanna spend money for no reason.
that’s why Stock height is a 30 on a 19” wheel and the rear is 25 on a 20” wheel, the front is taller to accommodate the rear taller wheels diameter
if your wheel diameter is equal on all 4 corners (18’s) then having an equal height would still keep you within close to the same rolling diameter to keep your cars handling system happy
To keep the stability control system happy you need about a 1" difference in tire diameter front-to-rear, with the rear being larger (factory is a 0.9" difference front-to-rear).
For your preferred rear size the best front tire size would be the 275/40/18, which is 0.8" shorter than the 345/35/18. The 275/35/18 tire is an inch shorter than that, which might trigger the active handling fault.
that’s why Stock height is a 30 on a 19” wheel and the rear is 25 on a 20” wheel, the front is taller to accommodate the rear taller wheels diameter
if your wheel diameter is equal on all 4 corners (18’s) then having an equal height would still keep you within close to the same rolling diameter to keep your cars handling system happy
that’s about as dumb down as I can explain it lol
I was always taught ask any question cause it might be relevant to you but maybe not to someone else. That being said, I find it extremely interesting in the choice of your words. Let me dumb it down for you, it wasn’t layman’s term, or let me explain for you.
thank you for dumbing it down for me. I would have never understood.
thank you for showing me a pic of what you are running I appreciate it. Was looking to see what someone else had thank you
You're welcome, my tire sizes were recommended for my specific application though, which is for the track, you can definitely run a narrower tire up front and save a bit of money and weight
I was always taught ask any question cause it might be relevant to you but maybe not to someone else. That being said, I find it extremely interesting in the choice of your words. Let me dumb it down for you, it wasn’t layman’s term, or let me explain for you.
thank you for dumbing it down for me. I would have never understood.
wait… did saying dumbed down offend you? I’m confused why that got your attention so much.
I don't have a ZR1, but I replaced the OEM wheels and tires on my GS with smaller wheels and tires ... However, the replacement tires have more sidewall and are slightly taller than OEM.
Replaced OEM front 18x9.5 wheels and 275/35-18 tires . . with . . 17x9.5 wheels and 285/40-17 tires
Replaced OEM rear 19x12 wheels and 325/30-19 tires . . with . . 18x11 wheels and 295/40-18 tires
The replacement front tires are 0.4" taller than OEM. . . The replacement rear tires are 0.6" taller than OEM.
Some pics of my new welds for fitment examples. lowered on stock bolts all in rear some in front. Weld S77 series (looks like they would clear the zr1 calipers) id verify w weld
these tire sizes seem to keep active handeling happy
18x10 forgestar cf5s with 275/40/18 Mickey Thompson Street comps up front and 18x12 cf5s with 345/35/18 Mickey Thompson et street ss in the rear and no codes. They do rub slightly up front at full lock with stock height suspension.
06-16-2021, 05:34 PM
18 inch rims on a ZR1.
