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I have aftermarket rims. C6 z51
Current:
Front is 275/35/18
Rear is 305/35/19
1) I have 700hp and traction will always be an issue. I want to go with 305/30/19 in the rear as it has more options available. The 30 rear is basically an inch smaller diameter - which I think I can make up no problem with my coil overs ride height. Will that look goofy in the wheel well?
Thinking of Advan v601
275/35/18 - 25.4" diameter
305/30/19 - 26.2" diameter
You may want to make sure your TPMS sensors are going to be ok with that change. If not, you will not like the results unless you can program them out to not put the car in limp mode
Personally, I would not change the tire diameter just for a wider option of tires.
You may want to make sure your TPMS sensors are going to be ok with that change. If not, you will not like the results unless you can program them out to not put the car in limp mode
Personally, I would not change the tire diameter just for a wider option of tires.
I am at max width for the 19x10.5" rims. I'd need some different offset or body panels to get wider.
As for TPMS, I think they should be totally unaffected. 30psi is 30psi, no?
I am at max width for the 19x10.5" rims. I'd need some different offset or body panels to get wider.
As for TPMS, I think they should be totally unaffected. 30psi is 30psi, no?
width does not increase traction like the internet would make you seem it does.
TPMS is part of the equation, but there are wheel speed sensors and likely other sensors that will throw the active handling and traction control flags and limit the car to 50mph if th sensors are not seeing what they want. There is a small amount of range to play with. I think a 1.4” difference is the limit, but I do not recall offhand.
If you want more traction, tire selection is part of it, but not all of it. Dial in suspension and your tune.
Depending on where your traction probls are, if you are taking this seriously, your tuner can adjust how the power ramps in to an extent.
I just wanted to be clear that a wider tire is not the answer, and a slightly stickier compound is only a small part of the fix.
Also, not all tire manufacturers are equal on sizing. You can see quite a variation on width and height from model to model and brand to brand if you look at their true specs from their spec sheet.
Also, where do you live? Those tires make specific mention to temperature. If you get an actual winter, I would keep the weight of the car off those ties during the winter and not drive them probably under 60*
I ruined a set of 200tw tires that way
Last edited by PMPerformance; Aug 28, 2025 at 07:35 PM.
Right, need to keep within an inch or so back to front, back tires being larger diameter. That's squared away - dimaters listed for those v601's.
I'm in Southern California so very little rain, never below 55f here, and never snow of course.
Mainly my concern is the 30 part of the 305/30/19. I think the z06 come with 30 aspect ratio tires so maybe not that big of a concern. Ive just always had 35 in the rear.
If oem width rear rims, you get less traction with the 305's, then you would with the 295's, since the 305 are ballooning on the rim to center patch only instead.
As for wider rear tires still, not a problem since you can get wider rims for the base model, that has the correct off set to push the wider rims inside more towards the inside center line of car, so outside of tire is not protruding past the fender lips to distroy them the first bump you hit to send the tires into the fender lips of the side pannels.
As for car, and on the street, Torque management is your friend, since it can be turned down so tires are not breaking all over the place when breathing on the gas pedel ,and since it only deals with instant power torque values alone, you still get all the power that the motor has to offer for top end runs, where the power is ramping up slower to the ground instead.
The only way you are sending tires into the fenders is if you are lowered and hit a hell of a pothole.
i had 20mm spacers on for quite awhile and ran the snot out of the car in twisties and never once did I fear contact with my fenders.
i am at stock height though
OP, do you have a centrifugal on? Because power ramps with RPM. A roots style is a little different game
Right, need to keep within an inch or so back to front, back tires being larger diameter. That's squared away - dimaters listed for those v601's.
I'm in Southern California so very little rain, never below 55f here, and never snow of course.
Mainly my concern is the 30 part of the 305/30/19. I think the z06 come with 30 aspect ratio tires so maybe not that big of a concern. Ive just always had 35 in the rear.
I'm running 315-30/ 19 on 11" rims & 265-35/ 18 up front with no problems
The only way you are sending tires into the fenders is if you are lowered and hit a hell of a pothole.
i had 20mm spacers on for quite awhile and ran the snot out of the car in twisties and never once did I fear contact with my fenders.
i am at stock height though
OP, do you have a centrifugal on? Because power ramps with RPM. A roots style is a little different game
Yep, Centri. Just 8lbs.
Last edited by Benonmsn; Sep 16, 2025 at 03:14 AM.
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