Need help with tires
Thread Starter
8th Gear
Joined: Feb 2025
Posts: 8
Likes: 0
Need help with tires
Was wondering if anyone has had any luck with running a tire size of 275/40/19 tires in the rear? Will there be any rubbing or any implications with any of the cars systems. For clarification I have the stock tire sizes and rims on the car currently. Thanks 
Race Director
Joined: Jan 2000
Posts: 10,356
Likes: 3,381
From: Central TX
C5 of Year Finalist (appearance mods) 2019
The car's AH/TC systems aren't sensitive and won't really care, as long as the front tires aren't taller than the rears.
Thread Starter
8th Gear
Joined: Feb 2025
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got it, so should I just stay away from the 19s?
(Sorry if I didn’t reply properly this is my first time using the forum)
Race Director
Joined: Jan 2000
Posts: 10,356
Likes: 3,381
From: Central TX
C5 of Year Finalist (appearance mods) 2019
Thread Starter
8th Gear
Joined: Feb 2025
Posts: 8
Likes: 0
Race Director
Joined: Jan 2000
Posts: 10,356
Likes: 3,381
From: Central TX
C5 of Year Finalist (appearance mods) 2019
Later down the line I plan on switching to some replica c6 grand sport wheels which are 19s in the back and 18 in the front. My problem is the back wheels are 15 years old and the fronts are 6 years old. Not sure why the previous owner never thought to replace them but now I gotta change them and I don’t have the money for both the rims and tires. Right now I’m just focused on making sure my wheels won’t randomly explode as I’m driving down the road, knock on wood
Race Director
Joined: Jan 2000
Posts: 10,356
Likes: 3,381
From: Central TX
C5 of Year Finalist (appearance mods) 2019
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Thread Starter
8th Gear
Joined: Feb 2025
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yea, the tread on them is still pretty good and the material of the tire still seems to be in good shape, no dry rot or any cracking. I guess the previous owner just let the car sit in a garage most of the time and neglected it. Still bothers me having old tires on the car though.
Race Director
Joined: Jan 2000
Posts: 10,356
Likes: 3,381
From: Central TX
C5 of Year Finalist (appearance mods) 2019
yea, the tread on them is still pretty good and the material of the tire still seems to be in good shape, no dry rot or any cracking. I guess the previous owner just let the car sit in a garage most of the time and neglected it. Still bothers me having old tires on the car though.
Thread Starter
8th Gear
Joined: Feb 2025
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yea I’ll probably keep the old tires as well, so end of story the 275/40/19 tires won’t work on the rear stock c5 wheels?
Racer
Joined: Mar 2021
Posts: 255
Likes: 72
From: Maryland
Honestly, Apex Wheels has the best fitment guide I've seen for the C5, it explains what fitment works best for the street and for track and keeping the AH system happy:
https://apexwheels.com/fitment-guide...-fitment-guide
My C5 has 18/19 set up with 305/30 on the rear IIRC and honestly I really hate how thin the sidewalls are on my car for street driving it rides rough on anything but smooth roads so I'm seriously contemplating going to a 18" square set up.
https://apexwheels.com/fitment-guide...-fitment-guide
My C5 has 18/19 set up with 305/30 on the rear IIRC and honestly I really hate how thin the sidewalls are on my car for street driving it rides rough on anything but smooth roads so I'm seriously contemplating going to a 18" square set up.
Thread Starter
8th Gear
Joined: Feb 2025
Posts: 8
Likes: 0
Honestly, Apex Wheels has the best fitment guide I've seen for the C5, it explains what fitment works best for the street and for track and keeping the AH system happy:
https://apexwheels.com/fitment-guide...-fitment-guide
My C5 has 18/19 set up with 305/30 on the rear IIRC and honestly I really hate how thin the sidewalls are on my car for street driving it rides rough on anything but smooth roads so I'm seriously contemplating going to a 18" square set up.
https://apexwheels.com/fitment-guide...-fitment-guide
My C5 has 18/19 set up with 305/30 on the rear IIRC and honestly I really hate how thin the sidewalls are on my car for street driving it rides rough on anything but smooth roads so I'm seriously contemplating going to a 18" square set up.
Gotcha I’ll take a look at this, thanks
Racer
Joined: Mar 2021
Posts: 255
Likes: 72
From: Maryland
No problem, and trash (well dispose of them properly I mean) those old tires. Old tires if they don't dry rot then they end up turning into solid shiny bricks, no good unless you plan to use them for drifting and even then I would expect them to pop. I used to work in parts at a Ferrari dealer and some previous manager ordered thousands upon thousands of dollars worth of weird size Pirelli tires so he could win a vacation to Italy. 14 yrs later they were still in climate controlled storage tire racks and were shiny and petrified.
