what backspace do I need for 245 40 17 up front on a 69 - Team Camaro Tech
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post #1 of 15 (permalink) Old Aug 6th, 07, 09:28 PM Thread Starter
 
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Question what backspace do I need for 245 40 17 up front on a 69

well I already bought the tires Nitto NT01's so I have to make it work, what is going to be the best for backspace? should I go 4.75 or even more?
Thanks
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post #2 of 15 (permalink) Old Aug 7th, 07, 11:50 AM
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Re: what backspace do I need for 245 40 17 up front on a 69

Quote:
Originally Posted by NewmanZL1 View Post
well I already bought the tires Nitto NT01's so I have to make it work, what is going to be the best for backspace? should I go 4.75 or even more?
Thanks
Unless you can find someone here with the exact same tires and wheels, it's going to be hard. You are just going to have to measure with a stock wheel and tire combo or something else. The backs are easier because they don't turn. It's the "lock to lock" you have to watch out for so they don't rub when turning and turning when hitting a bump. To just order wheels and guessing a backspace like 4.75 can get expensive. I think the best thing to do is take one of the tires to a local tire shop and have them mount the tire on some kind of a 17" inch wheel. Then you can see based on what that backspace is, whether to add or subtract some. Good luck!!!


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post #3 of 15 (permalink) Old Aug 7th, 07, 12:27 PM
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Al
 
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Re: what backspace do I need for 245 40 17 up front on a 69

I got a very slight rub on the subframe at full lock with 235/45-17 and 4.75 BS. 245 is a bit wider. I think it's better to have a bit too much backspace - you can adjust outward with wheel spacers. Obviously, you can't go the other direction. That's a lot of tire to fit in the front on a 69, esp if the car is lowered, although it's been done


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post #4 of 15 (permalink) Old Aug 7th, 07, 12:34 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

what size wheel? an 8 or 8.5?

Steve
1968 that started life and a 6 banger with a PG. Now it's a 350 with a TKO600, Moser 12 bolt, Speedtech LCA/UCA, ATS Tall Spindles, Hotchkis Springs, Forgeline ZX3P, C5 (Kore3) brakes with other cool stuff from Ron Davis, Vintage Air and soon to be Terminator EFI.


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post #5 of 15 (permalink) Old Aug 7th, 07, 03:17 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

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Originally Posted by BPOS View Post
you can adjust outward with wheel spacers.
At all cost, avoid wheel spacers. They are scary on back at best. I would NEVER run them on the front. As the great Chris Rock once said "sure you can drive a car with your feet.....but that doesn't make it a good idea"!!

Spacers put the load of the car on a part of the lug stud that wasn't designed to hold the weight. You need to be flush against the hubs with your wheels to be safe.


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post #6 of 15 (permalink) Old Aug 7th, 07, 04:10 PM
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Rod
 
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Re: what backspace do I need for 245 40 17 up front on a 69

I am running 235/45/17 mounted on 17x8 rims with 4.875" BS up front, and in the back I am running 275/40/17 mounted on 17x9.5 with 5.5" BS as recommended by DSE.

Rod
69 Camaro with LS2/4l70e

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post #7 of 15 (permalink) Old Aug 7th, 07, 05:47 PM Thread Starter
 
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Re: what backspace do I need for 245 40 17 up front on a 69

they will be on 8 inch wheels, and right now the car has 245 60 14 on it and there is no rub whatsoever, but the wheels are probably 7inch, so right now I am thinking at least 4.75 maybe even 4.875, anyone else have any insight?
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post #8 of 15 (permalink) Old Aug 7th, 07, 09:27 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

I've run a 4.75"-5" backspace for the past couple of years on the front of first gens and the best fitment if you are in fact going custom built 2pc or 3pc wheel is a 4.875", or 5" with a 245 wide tire.

This is my old car while I worked at Budnik:4.875" backspace on an 18x8.


Jon
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post #9 of 15 (permalink) Old Aug 7th, 07, 09:31 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

I'm running 5.3 on an 8.5" with a 245/40/18 on my 68.
There's a few pictures here...
https://www.camaros.net/forums/showpo...&postcount=118
I still need to get it aligned as there is quite a bit of POS camber. But it fits with a little rub right now. I have no idea what the caster is.

Steve
1968 that started life and a 6 banger with a PG. Now it's a 350 with a TKO600, Moser 12 bolt, Speedtech LCA/UCA, ATS Tall Spindles, Hotchkis Springs, Forgeline ZX3P, C5 (Kore3) brakes with other cool stuff from Ron Davis, Vintage Air and soon to be Terminator EFI.


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post #10 of 15 (permalink) Old Aug 8th, 07, 04:08 PM Thread Starter
 
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Re: what backspace do I need for 245 40 17 up front on a 69

Thanks Jon i guess i will go with 4.875 backspace, I am think I am going to get the Centerline Daggers. Will they backspace any ammount I specify?
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post #11 of 15 (permalink) Old Aug 9th, 07, 12:34 PM Thread Starter
 
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Re: what backspace do I need for 245 40 17 up front on a 69

Well centerline will only backspace 4.5 or 5
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post #12 of 15 (permalink) Old Aug 10th, 07, 10:22 PM Thread Starter
 
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Re: what backspace do I need for 245 40 17 up front on a 69

Well I decided to go with Budniks, for less 300$ more it seems like a pretty good deal.
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post #13 of 15 (permalink) Old Aug 14th, 07, 04:08 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

For what it's worth,I run 255/45-17's on a 8" wide wheel on the front of my '69 Z/28 with 4.75" b/s and my car is slammed low...23.5" from center of wheelwell to the ground and no issues.If your suspension is set on "kill" like mine,no clearance problems...


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post #14 of 15 (permalink) Old Aug 14th, 07, 04:14 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

Quote:
Originally Posted by musclecarjohn View Post
For what it's worth,I run 255/45-17's on a 8" wide wheel on the front of my '69 Z/28 with 4.75" b/s and my car is slammed low...23.5" from center of wheelwell to the ground and no issues.If your suspension is set on "kill" like mine,no clearance problems...


That is a bitchin' stance on that 69!!!!!


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post #15 of 15 (permalink) Old Aug 14th, 07, 05:33 PM
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Re: what backspace do I need for 245 40 17 up front on a 69

Thanks man...here's a few more:







'67 Buick Skylark F/C "Ingenue" 8/10 HRM feature / 2/12 Gasoline (Swedish) feature
World's only Buick-powered Buick Funny Car!
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