Tires?
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,600
Likes: 88
From: Springfield PA
Philly 'Burbs Events Coordinator
Tires?
I have to replace my tires. Currently have Kuhmo 285/40r17s. Can't seem to find that size in an all season tire. Plenty of tires in the 275 size but would prefer to keep the same size. Anyone?
Race Director
Joined: Dec 2002
Posts: 13,348
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
You can add the Pirelli PZero System tires to the 285 tires available for the C4, but they are a bit pricey.
Last edited by rocco16; Apr 24, 2025 at 09:11 AM.
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
I went with 285's also.
I still have a set of never mounted Continental 285/40/17 extreme contact tires. Willing to sell cheap.(now sold)
If anyone is interested shoot me a PM.
I still have a set of never mounted Continental 285/40/17 extreme contact tires. Willing to sell cheap.(now sold)
If anyone is interested shoot me a PM.
Last edited by QCVette; May 11, 2025 at 09:22 AM.
Race Director
Joined: Oct 2005
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From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
That is the factory size on the '96 I had.
285/40-17 on 9.5" rims Rear
255/45-17 on 8.5" rims Front
Very few options for that 285/40-17 size these days though
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Race Director
Joined: Oct 2012
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From: Melbourne, FL
If you're not, you should be, lol. Gets rid.of some under steer.
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,600
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From: Springfield PA
Philly 'Burbs Events Coordinator
Yep, the Nittos and Contis in 285 are summer tires. I drive mine all year so I need all seasons. No other 285s except $Michelins$. 285 was stock for my"93. Have aftermarket wheels that are all 9.5". Looks like I'm going to 275s.
That maybe a nice improvement.
Gets rid of some under steer.
Melting Slicks
Joined: Nov 2016
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From: So Cal
2023 C4 of the Year Finalist - Unmodified
Unless you drive the car in anger fairly frequently, I don't think you'll detect a difference. You may notice a slight increase in wandering on grooved pavement, which is what the reduction in front tire width for 93 addressed. The narrower front wheel and wider rear tire were to rebalance the car with the reduction in front tire width.
Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
All the 88-96 C4s with Z51 or Z07 handling packages had 17x9.5 wheels with 275/40/17 square fitments. But as IHBD mentions, the 93+ cars with 285 and 255 tires had narrower front wheels. Don't fit 275s on those 8.5" wheels. Instead, if you have those front wheels, go with 275/40/17 rears and 245/45/17 fronts. If you have 17x9.5 front and rear, then by all means fit 275/40/17 front and rear.