Another Tire/Wheel Question? - Team Camaro Tech
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post #1 of 12 (permalink) Old Nov 29th, 16, 01:38 PM Thread Starter
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Another Tire/Wheel Question?

I am considering replacing my 15x8 Vette Wheels for Foose Knuckle F097 17x8 +1 for all 4. The question will I have fit issues in the front? I like the current tire size that fills the well but not too big, 245, 225, 60's, so what recommendation tire size for the 17's? Had those wheels since 84 so time to modernize. Suspension is stock.
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post #2 of 12 (permalink) Old Nov 29th, 16, 05:34 PM
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Re: Another Tire/Wheel Question?

A 50 series 17" tire would keep the diameter the same as a 60 series 15", but you might find more 17" tire options in a 45 series.

Are you wanting to go with a 225 front, 245 rear? Those should be very safe sizes with a +1 offset.


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post #3 of 12 (permalink) Old Nov 29th, 16, 07:00 PM
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Re: Another Tire/Wheel Question?

Check out these older posts with respect to 17" wheel/tire recommendations:

https://www.camaros.net/forums/17-whe...ire-sizes.html

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post #4 of 12 (permalink) Old Nov 29th, 16, 08:13 PM
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Re: Another Tire/Wheel Question?

These posts come up every once in a while and when the conversation turns to front bs its not often i see the question of disc or drum rotors raised. In the attached old post George says he hits on occasion. With a 4" bs and disc rotors ??? wouldnt you expect him to?

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post #5 of 12 (permalink) Old Nov 30th, 16, 04:38 AM Thread Starter
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Re: Another Tire/Wheel Question?

Disc brake car. What does +1 mean on an 17x8 wheel. What is the recommendation as a bs for the front. I think my vette rallys are 4.5. I like the deep look.
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post #6 of 12 (permalink) Old Nov 30th, 16, 05:25 AM
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Re: Another Tire/Wheel Question?

Quote:
Originally Posted by The Camaro Guy View Post
Disc brake car. What does +1 mean on an 17x8 wheel. What is the recommendation as a bs for the front. I think my vette rallys are 4.5. I like the deep look.
+1 is the wheel offset in mm. This calculator will let you convert it to backspacing:

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post #7 of 12 (permalink) Old Nov 30th, 16, 05:55 AM
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Re: Another Tire/Wheel Question?

Quote:
Originally Posted by The Camaro Guy View Post
Disc brake car. What does +1 mean on an 17x8 wheel. What is the recommendation as a bs for the front. I think my vette rallys are 4.5. I like the deep look.
+1 is almost exactly 4.5" bs on an 8" wheel.

The generally accepted rule is that a +6mm offset will put the wheel as close to dead center as possible. The further away from +6 in either direction you get the bigger the risk of rubbing, which is why people often have to run smaller tires. A higher offset (i.e. +12) moves the wheel closer to the subframe and a lower offset (i.e. +0) moves it out towards the fender.


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post #8 of 12 (permalink) Old Nov 30th, 16, 06:34 AM
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Re: Another Tire/Wheel Question?

Quote:
Originally Posted by 67Rally View Post
+1 is almost exactly 4.5" bs on an 8" wheel.
True.

4.5" is centered on an 8" wheel.

+1 means it is .040" set towards the inside (1 mm = .040" )

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post #9 of 12 (permalink) Old Nov 30th, 16, 07:20 AM
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Re: Another Tire/Wheel Question?

Use this info to figure things out... https://www.rsracing.com/TechWheel.aspx

If your 15x8 fits as you like figure out the offset & backspacing and get 17x8 to match.

A factory 15x7 rally wheel (69 Z/28) has a 4.25 bs (+6 offset) and centers the wheel and tire between the inner and outer limits the tire has to fit in. A +6 on any other wheel width will do the same.

If you are trying to match tire dia to your 15's go to Tire Rack - Your performance experts for tires and wheels and search tires by size and go to spec's to cross reference the 17" that matches.

What year is your Camaro? it makes a difference...

Plus 1 (+1) could mean 1" taller, just talking wheels a 17" is a +2 but with a tire mounted it could be a +1. I guess it could refer to offset but the difference in a 1/4" of backspacing is +-6 (see the chart on the linked page above)

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post #10 of 12 (permalink) Old Nov 30th, 16, 11:31 AM
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Re: Another Tire/Wheel Question?

Quote:
Originally Posted by DjD View Post
Plus 1 (+1) could mean 1" taller, just talking wheels a 17" is a +2 but with a tire mounted it could be a +1. I guess it could refer to offset but the difference in a 1/4" of backspacing is +-6 (see the chart on the linked page above)
The original post stated that he was looking at "Foose Knuckle F097 17x8 +1". That should be enough to know that it's a +1mm offset wheel, and not referring to plus sizing a tire/wheel combo.


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post #11 of 12 (permalink) Old Dec 1st, 16, 04:57 AM Thread Starter
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Re: Another Tire/Wheel Question?

Thanks for all the info guys.
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post #12 of 12 (permalink) Old Dec 1st, 16, 07:41 AM
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Re: Another Tire/Wheel Question?

Just for more reference,
The rollers I used while assembling my car were 17"x 7" all the way around, with 4" back space. 245 40 on the front, 245 45 on the rear. Car is lowered 3" Front would rub at full lock.
Back were way too skinny (I have a 9" wheel now with a 275 35/18) but I liked the way the 245/45 side wall filled the wheel space.

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