C6 Tire Drag Pak
Thread Starter
Instructor
Joined: Apr 2009
Posts: 203
Likes: 27
From: Shelby Twp. Michigan
C6 Tire Drag Pak
I'm looking for some input on tire size diameter without causing active handling issues.
I have it narrowed down to weld wheels rims with mickey thompson tires, however the closest difference between the front and rear diameters are 2" with a 26.5" front and a 28.5" tall rear, there is a 27.5" front but I'm concerned about it rubbing.
I have it narrowed down to weld wheels rims with mickey thompson tires, however the closest difference between the front and rear diameters are 2" with a 26.5" front and a 28.5" tall rear, there is a 27.5" front but I'm concerned about it rubbing.
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Joined: Feb 2011
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2024 C6 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
I'm looking for some input on tire size diameter without causing active handling issues.
I have it narrowed down to weld wheels rims with mickey thompson tires, however the closest difference between the front and rear diameters are 2" with a 26.5" front and a 28.5" tall rear, there is a 27.5" front but I'm concerned about it rubbing.
I have it narrowed down to weld wheels rims with mickey thompson tires, however the closest difference between the front and rear diameters are 2" with a 26.5" front and a 28.5" tall rear, there is a 27.5" front but I'm concerned about it rubbing.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
How much power and are you A6 or M6? If A6, what converter and what axle gear?
OEM rear size is 1.05 times the fronts when new. The known workable limits are bald fronts vs new rears and new fronts vs bald rears. Tread depth when new is 9/32". You can do the math to see if your combo works or how far from the limits you may be.
The lightest low cost drag pack is 26" M&H bias skinnies on 17" GTO spare wheels and 275/40/17 Hoosiers on C5 Z06 cast front wheels.
From years of experience racing in Northern Ohio and Southern Michigan, you will get caught in rain sometime. The only safe method is to change tires/wheels at the track, since a drag pack only has traction on dry pavement.
OEM rear size is 1.05 times the fronts when new. The known workable limits are bald fronts vs new rears and new fronts vs bald rears. Tread depth when new is 9/32". You can do the math to see if your combo works or how far from the limits you may be.
The lightest low cost drag pack is 26" M&H bias skinnies on 17" GTO spare wheels and 275/40/17 Hoosiers on C5 Z06 cast front wheels.
From years of experience racing in Northern Ohio and Southern Michigan, you will get caught in rain sometime. The only safe method is to change tires/wheels at the track, since a drag pack only has traction on dry pavement.
Thread Starter
Instructor
Joined: Apr 2009
Posts: 203
Likes: 27
From: Shelby Twp. Michigan
The car is a 05 manual with a 4.10 gear, drivetran has had the RPM upgrades while having dynoed 400 natural and 600 with nos.
I’ve been fortunate to only get caught in the rain twice since buying it new, I’m adding LG’s track box so I can drop the rear tires below 23 psi while disabling the traction control.
My concern is to keep the AH/TC issues at bay while doing some street driving and occasional track use. Thanks for your detailed response.
I’ve been fortunate to only get caught in the rain twice since buying it new, I’m adding LG’s track box so I can drop the rear tires below 23 psi while disabling the traction control.
My concern is to keep the AH/TC issues at bay while doing some street driving and occasional track use. Thanks for your detailed response.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
The car is a 05 manual with a 4.10 gear, drivetran has had the RPM upgrades while having dynoed 400 natural and 600 with nos.
I’ve been fortunate to only get caught in the rain twice since buying it new, I’m adding LG’s track box so I can drop the rear tires below 23 psi while disabling the traction control.
My concern is to keep the AH/TC issues at bay while doing some street driving and occasional track use. Thanks for your detailed response.
I’ve been fortunate to only get caught in the rain twice since buying it new, I’m adding LG’s track box so I can drop the rear tires below 23 psi while disabling the traction control.
My concern is to keep the AH/TC issues at bay while doing some street driving and occasional track use. Thanks for your detailed response.
I'm thinking those rear tires are too tall for your power and you're killing some of the gearing benefit. I don't see any MT at 28.5", so exactly what are you looking at?
BTW, I've driven about 10K miles with no sensors & well up into triple digits. I don't have sensors in my drag tires either and have no problem turning TC off.
Thread Starter
Instructor
Joined: Apr 2009
Posts: 203
Likes: 27
From: Shelby Twp. Michigan
Search for JoeG posts, since his closely resembles your car and the power is in between your NA and NOS.
I'm thinking those rear tires are too tall for your power and you're killing some of the gearing benefit. I don't see any MT at 28.5", so exactly what are you looking at?
BTW, I've driven about 10K miles with no sensors & well up into triple digits. I don't have sensors in my drag tires either and have no problem turning TC off.
I'm thinking those rear tires are too tall for your power and you're killing some of the gearing benefit. I don't see any MT at 28.5", so exactly what are you looking at?
BTW, I've driven about 10K miles with no sensors & well up into triple digits. I don't have sensors in my drag tires either and have no problem turning TC off.
My goal was to take some rotating mass off of the wheels with some lightweight weld wheels while improving traction, I was having a hard time finding tires within a 1.5” diameter of each other but I have finally found it with Hoozier and Mickey, although the fronts will be a 17” and the rears will be a 15”.
Le Mans Master
Joined: Nov 2005
Posts: 7,059
Likes: 366
From: Kendall Park NJ
Thanks for your reply, I am familiar with you and joeG’s posts, which are always good info. I was able to find a Hoosier QuickTime DOT bias ply at 28” tall with a Mickey Thompson bias front runner at 26.5” tall. My LG track box came in recently so I will just install that even though you say without sensors I shouldn’t have a problem. I am currently running the NITTO NT05r package on the car which needs to be close to 15-16 PSI in the rear because of the stiff sidewall for descent traction but has too much sway for me.
My goal was to take some rotating mass off of the wheels with some lightweight weld wheels while improving traction, I was having a hard time finding tires within a 1.5” diameter of each other but I have finally found it with Hoozier and Mickey, although the fronts will be a 17” and the rears will be a 15”.
I have heard of issues with a 28" tire on a 15" wheel due to the additional sidewall. Tire growth may cause the tire to contact the fender liner at the top end. This happened on my buddy's C6Z. You should look at the 27" Hoosier. This tire will grow approximately an inch at the top end and give you a trap speed of 138 mph at 6800 rpm.
Last edited by GARY2004Z06; Mar 17, 2018 at 11:04 AM.
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