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Discussion Starter #1
Hi,

I have a stock height 1969 Camaro and I have been looking through the site to see if I could find out what the largest size tire and rim will fit without any rubbing issues.

I am thinking either one of two combos

18 x 9 in the rears with 4.7 BS with HANKOOK - VENTUS V2 CONCEPT H437
17 x 8 in the front with 4.5 BS with HANKOOK - VENTUS V2 CONCEPT H437

Or

17 x 9 in the rears with 4.5 BS with HANKOOK - VENTUS V2 CONCEPT H437
16 x 8 in the front with 4.5 BS with HANKOOK - VENTUS V2 CONCEPT H437

Can some tell me if they have either of these set ups and if there are any issues with rubbing. Remember I have a stock height Camaro.

Thx,

Joe
 

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Can't really say if you'll have rubbing all the way around with those wheel choices since you haven't provided any tire sizes on any of the wheels!

That said, to best center your wheels and tires in the stock wheel wells you want a positive 6 offset. Use this chart to see what backspacing you need with different wheel widths to give you that positive 6 allowing you to put the widest tires possible.

 

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And since that chart doesn't show it, 4.75 would be best for the front 8" being considered.

I know that chart has been around a while but I wonder why it skips 4.75
 

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I think the 17x8 and 18x9 is a very nice fit for the first gen Camaros. It offers a staggered setup and matching tires should be very easy to find in the different diameters. You won't have any rubbing issues on those sizes, as long as you have the right back spacing. Let me know if I can help you out any with the wheels. What wheels in particular did you have in mind of going with?

In my opinion, you might have some rubbing issues on the rear with that backspace. Typically, I would go with something a little more tucked in.

4.75 is a good backspace up front, but have used 4.5 before. Depends on how low the car is. The plus 6 offset on the rear will be good, and allow for a 275 rear tire on a 9" wheel.

Travis
 

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Joe, 9" in the rear will be no problem. 8" in front also will be fine, especially if your car is not lowered. I am currently running 9.5" in the rear with plenty of room.
 

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Discussion Starter #8
Thanks for all the help on this so I have been doing some searching and found these tools to be very helpful since I was trying to get as tall of a tire and rim comb as possible.

http://tire-size-conversion.com/tire-height-calculator/

http://www.customwheeloffset.com/tire-wheel-backspacing-offset-calculators

http://kgm.tiwing.com/calcs/tiresizecalc.htm

http://tire-size-conversion.com/tiresizes/

I currently have:

Front 235/60R14 = 25.1 x9.3R14
Rear - 255/60R15 = 27.8 x10R15

The new setup I am going to go with ( I think is)

Front - 235/50R17 = 26.3x9.3R17
Rear - 255/50R18 = 28x9R18

Rims will be AR605M Torq Thrust M Chrome if they come in the correct back spacing. I need to check on this.

Anyone have pictures of their setup similar to this I am trying to get a visual on how this will look.

Thanks again everyone.

-Joe
 

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I don't think you'll find a Torque Thrust M in an 18x9 with the right backspacing. There are several other brands with a similar design though.

Also, you'll probably want to go with a 45 series front tire and a 40 series rear on a 17/18 setup.

***edit***
Actually a 45 series front and rear would probably be better. With a 45 series up front/40 series rear, you'd have more sidewall in the front than the rear which would look odd.
 

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I don't think you'll find a Torque Thrust M in an 18x9 with the right backspacing. There are several other brands with a similar design though.

Also, you'll probably want to go with a 45 series front tire and a 40 series rear on a 17/18 setup.

***edit***
Actually a 45 series front and rear would probably be better. With a 45 series up front/40 series rear, you'd have more sidewall in the front than the rear which would look odd.
Actually this is where it's time to do the math: Example -

245/45/17 tires and 275/40/17 tires have the same size sidewall. Both tires are 25.7" tall minus 17" wheel = 8.7" / 2 = 4.35" sidewall...

There is lots of room for a little give and take, having the same sidewall looks the best but; another example - my 235/45/17 and 255/45/17 tires have a 4.2" and 4.55" sidewall, just a little more than 1/4" difference and it doesn't detract from the look. Once you start staggering wheel size you really have to let sidewall size fall where it may if you want the widest tires possible. A 275/35/18 and a 245/45/17 for example are 1/10" off in overall height but the 18 would only have about 2" of sidewall and the 17 would have over 4" of sidewall. You'll need over 3" difference in tire height to run the widest possible tires on a 1st gen with a 17/18 stagger and dial in the sidewall height as close as possible.

Here's a side view of my car...

 

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Dennis, yes 67-68 wheel well shape is a tad different. Not that different though unless he is completely maxing out space to the inth degree.

I am running FRONTS 17x7 & REARS 17x9.5's

Plenty of room all around.
 

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Discussion Starter #15 (Edited)
John68,

Stock = not lowered, not tubbed, no drop axle...

-Joe
 

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Discussion Starter #16
My Camaro now...

 

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So how much side clearance is recommended for a 40/45 series tire on a 17-inch wheel to allow for tire and suspension movement?
 

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Actually this is where it's time to do the math: Example -

245/45/17 tires and 275/40/17 tires have the same size sidewall. Both tires are 25.7" tall minus 17" wheel = 8.7" / 2 = 4.35" sidewall...

There is lots of room for a little give and take, having the same sidewall looks the best but; another example - my 235/45/17 and 255/45/17 tires have a 4.2" and 4.55" sidewall, just a little more than 1/4" difference and it doesn't detract from the look. Once you start staggering wheel size you really have to let sidewall size fall where it may if you want the widest tires possible. A 275/35/18 and a 245/45/17 for example are 1/10" off in overall height but the 18 would only have about 2" of sidewall and the 17 would have over 4" of sidewall. You'll need over 3" difference in tire height to run the widest possible tires on a 1st gen with a 17/18 stagger and dial in the sidewall height as close as possible.

Here's a side view of my car...

I think you're overcomplicating it or looking for an argument? If anything you want as much or more sidewall in the the rear. If the front has a lot more sidewall than the rear, it will look strange. That's why I went back and edited my original post (long before your post) to say you would want to run 45 series front and rear.

It's not that complicated. Sidewall is simply width times height. As you know the first number is the width in mm, the second number is the aspect ratio, which is a percentage of the first number.

You don't even need to figure in wheel diameter. Just multiply the first number by the second to calculate the sidewall in mm, and see which tire has more sidewall.
 

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I was asking how much clearance is needed between the tire and the car body during dynamic loading. Assume Hotchkis leaf springs and coil springs.
 

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Brent I'm not looking for an argument at all where did I say anything supporting less sidewall in the rear? My comments are intended as general information and I gave an easy way to figure sidewall height. Also total wheel height is utmost important on these cars and not only effects how wide a tire you can run but also effects final drive ratios. A car with a 26" tire and an identically setup car with 28" tires will not only accelerate differently it will handle different as well and plus sizing can lead to under performing brakes and that's a safety issue.

The only thing you can take from this is that I might not be a fan of staggered wheels but I certainly don't care if you or others run them and I am even willing to post info addressing fitting tire and wheel sizes in hope it makes someone stop and think about what they are doing before they spend money more than once because they asked others what to run.

Nothing wrong with the way you figure sidewall or the way I do for that matter, you have to look up the tire spec's (width in your case, height in mine) and I don't see this as complicated; tire height subtract the wheel size and divide by 2.
 
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