American racing TT2 question
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
American racing TT2 question
I am about to replace my original rims to 17x8 TT2 on my `72 BB.
Think the boltcircle is 5x4,75 and backspace 4,00...am i right?
Also what is the original offset?.
What tires are you guys running if you have theese rims?
Car is stock and not lowered.
Think the boltcircle is 5x4,75 and backspace 4,00...am i right?
Also what is the original offset?.
What tires are you guys running if you have theese rims?
Car is stock and not lowered.
Last edited by clwi; Jul 31, 2015 at 12:02 PM.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
This was posted by someone else on the forum.
Last edited by JimLentz; Jul 31, 2015 at 02:03 PM.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Are you sure the backspace is 4.00 and not 4.5? An offset of 0 with an 8 inch wheel equates to a 4.5 inch backspace. An offset of -12mm equates to a 4 inch backspace with an 8 inch wheel.
This was posted by someone else on the forum.
This was posted by someone else on the forum.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
17 x 8 wheels with a 4 inch back space are hard/expensive to find. I just bout some 17 x 8 wheels with a 4.5 inch backspace. If everything works I will leave things as is, otherwise I will have to get longer wheels studs and use a 1/2 inch wheel spacer. For my wheels I got some 235/55 R17 Cooper Zeon RS3-A tires. I considered going 255/50 R17, but wasn't sure if I would have rubbing problems. I think that would have been fine if I had gone with the 1/2 inch spacers. When you mount the wheels check for clearance of the wheels and tires.
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Race Director
Joined: May 2006
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I just installed the 17x8 with 4.07" backspace offset -11 on my 69. If you use the American Racing website and input your year and car they give you the information you need.
http://www.americanracing.com/wheels...model=Corvette
http://www.americanracing.com/wheels...model=Corvette
http://www.americanracing.com/wheels...model=Corvette
http://www.americanracing.com/wheels...model=Corvette
Last edited by MelWff; Jul 31, 2015 at 05:17 PM.
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Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
I just installed the 17x8 with 4.07" backspace offset -11 on my 69. If you use the American Racing website and input your year and car they give you the information you need.
http://www.americanracing.com/wheels...model=Corvette
http://www.americanracing.com/wheels...model=Corvette
What tires do you use?
Drifting
Joined: Mar 2011
Posts: 1,347
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From: Kernersville NC
17x8 4.07" backspace is what you want. Forget talking about offset and backspace in the same sentence. It is simply a different term expressing the same thing. If you get much more than 4" backspace on a 17" wheel you may run into interference with the parking brake cable bracket. I have these wheels with plenty of clearance.
Melting Slicks
Joined: May 2004
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From: Gulf of America
2023 C7 of the Year Finalist - Unmodified
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Race Director
Joined: Sep 1999
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From: Plano TX
Stock rims were 15x8 with a 4" BS. Since you're sticking to an 8" wide rim you need to get one as close to 4" BS as you can.
I'm using Nitto 555 tires in 255/50-17. They're good tires and reasonably priced.
I'm using Nitto 555 tires in 255/50-17. They're good tires and reasonably priced.
Race Director
Joined: Jan 2007
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From: NYC NY
The perfect size tire would be 255/50-17s because they are 27" tall the same as stock but.........there's always a but........there could be rubbing issues in the front. There are some C3s on this forum running that combination with no issues.
Do want to run the same size front and rear so you can rotate? If so that size might not work. If you're not concerned with rotation buy 2 and test fit. I think if there were rubbing issues it would be with the wheels turned. Take a look at a '78 Pace Car and note where the fenders were trimmed from the factory on the leading edge and rear corner of the front wheel well. As mentioned above the 235/55-17s should work with no issues.
Do want to run the same size front and rear so you can rotate? If so that size might not work. If you're not concerned with rotation buy 2 and test fit. I think if there were rubbing issues it would be with the wheels turned. Take a look at a '78 Pace Car and note where the fenders were trimmed from the factory on the leading edge and rear corner of the front wheel well. As mentioned above the 235/55-17s should work with no issues.
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Race Director
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From: Plano TX
Race Director
Joined: May 2006
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tire size
Since I couldn't take a chance with rubbing I went with 255/45x17. They are approximately 1 inch less in diameter, 26". I went with the BF Goodrich g-force comp 2, a summer only tire with a W speed rating. Much better than the old 15" TA's.
Drifting
Joined: Mar 2011
Posts: 1,347
Likes: 121
From: Kernersville NC
17x8 4.07" backspace is what you want. Forget talking about offset and backspace in the same sentence. It is simply a different term expressing the same thing. If you get much more than 4" backspace on a 17" wheel you may run into interference with the parking brake cable bracket. I have these wheels with plenty of clearance.
255/50 rear and 245/45 front
Le Mans Master
Joined: Mar 2001
Posts: 5,739
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From: Lincoln, CA
The 215/75-15 you have a pretty tall at 30.7". Most of us stick to the 27" size.
The 245 come in at 27.6''.
I'm on 255/45-18 at 27" It rubs a tiny bit but I need to get it aligned still.