I have a line on a couple of these new for less than 200 a pc... was wondering if I ran this wheel and tire combo on the back, if it would work okay? I could run 255/50/17's as well, that might be a hair narrower. Any help would be greatly appreciated! :beers:
17X8 with 4 in bs and 255/45/17's on the rear of a 69?
LYK2ROC
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I have a line on a couple of these new for less than 200 a pc... was wondering if I ran this wheel and tire combo on the back, if it would work okay? I could run 255/50/17's as well, that might be a hair narrower. Any help would be greatly appreciated! :beers:
I have 15X7's with 3.5 in bs with 255/60R15 Radial TA's and they bulge a bit, but they don't rub... I figure it would be close, but not positive...
Jeremy, welcome fellow Iowan. Check out the sticky on the 69 combos. I see one guy is running 17x8 with 4.75 bs. He has 255/45's on the rear. I don't know if that .75 of an inch bs will cause you to stick out to far. If the seller is close to you ask them if you can try fitting one wheel on and see.
Thanks Ted! I have checked that many times, but it doesn't answer my question... I got taken on Ebay and got one that is 5.5 in bs... seller would never respond... 100% positive feedback
I think it would be very close...
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Will not work...4" b/s isn't enough and will have you rubbing the fenders.
4.5" on a 8" wide wheel is a minimum on these cars and even that is tight.
Yep... I'll be there Friday and Saturday... Maybe some on the 4th... I enjoy that... I went to the Hot Rod Power Tour in Newton, and wasn't all that impressed... I think the Good Guys is a better show.. so I am pumped.
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104 Posts
Good Guys always puts on a good show. Have fun you guys!
As for the wheels, we normally run a 9" wheel in the back with a 5.25" BS, and that is tight, so a 8 with a 4" is going to be a .25" even further outboard from where we like it to be, and that is not good. Ideally, an 8 with a 4.5" is about where you want to be. Some TT2s come "standard" with 4.75", and even that is okay.
As for the wheels, we normally run a 9" wheel in the back with a 5.25" BS, and that is tight, so a 8 with a 4" is going to be a .25" even further outboard from where we like it to be, and that is not good. Ideally, an 8 with a 4.5" is about where you want to be. Some TT2s come "standard" with 4.75", and even that is okay.
Damn... wish I would have known that before now... those wheels are long gone... I thought they would work by the way my 255's sit on there now with a 15X7 and 3.5" bs... they don't even come close to rubbing anywhere... and no I don't have air shocks, but my car sits much higher than yours in the rear end... so much you can see my aluminum differential cover... thanks for the info... It is much appreciated...:beers:
I guess it depends on the look you're after. Tucked or untucked. This is a 275/40ZR17 on a 9.5" rim with 5.5" backspacing.
MB Wheels Old School in chrome
front - 17x8, 4.75" backspace, 235/45R17 Hankooks
rear - 17x9.5, 5.5" backspace, 275/40R17 Hankooks
$1176 mounted, balanced, and shipped from discounttiredirect.com
$750 for the rims alone
Even less for the gunmetal finish.
![Image]()
![Image]()
![Image]()
MB Wheels Old School in chrome
front - 17x8, 4.75" backspace, 235/45R17 Hankooks
rear - 17x9.5, 5.5" backspace, 275/40R17 Hankooks
$1176 mounted, balanced, and shipped from discounttiredirect.com
$750 for the rims alone
Even less for the gunmetal finish.
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104 Posts
This car, lowered, looks to me like it would definitely rub.
Yep... That is what I was thinking... it may rub... really close to the outer lip... I hate the fact that you have to run such a short tire that is wide... 25.3 in (275/40R17) is just too short with my 3.90's... With my setup now... it is right at 2600-2800 rpm at 70 mph..just about perfect... I hate to see what cutting it down 2 inches will do...
Yes... Thank you steiner... But I don't want to be any taller than what I already have... Those seem pretty tall...
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1,928 Posts
...and just right if you have a truck.
275/40-17 on a 9.5" wheel w/5.5" backspacing is what you want,proven rear setup for a '69 Camaro...:yes:
This thread is a few months old but addresses my problem... sorta.
Keep in mind the wheels/tires are mounted on the car so my measurements aren't easy to make.
My 69 came with the MB Old School wheels and Kumho Ecsta ASX tires which are a pretty good Z rated tire.
Fronts:
17x8 (haven't measured but I'm sure that's what they are)
245/45/17
Rear:
18x9, now Discount Tire only shows an 18x8 with a 5x4.75 bolt pattern but my measurement shows about 9" wide, tire is about 11" wide so the wheel might even be a 9.5.
Here's the problem. I get a bit of rub, yes the rear suspension or at least the crappy air shocks need to go... but here's the problem, the rear is a 12 bolt out of a 70 model Camaro which if I understand correctly is about 1" wider. So figure 1/2" per side too wide.
Second problem: Discount Tire doesn't show backspacing but does show offset on a page I found.
http://www.discounttiredirect.com/direct/wheels/mb_wheels/product/byName.do?tmn=Old School
So, the fronts never rub, I'm happy there but the rears are obviously off and quite frankly I'd be happier with a 17" wheel and more sidewall.
The 18x8 they list with a 5x4.75 BP has a 0 offset.
The 17x9.5 has an offset of 6 and the 17x8 has options for an offset of 0 or 6.
So, let's assume that my measurement is off some on the 18 width, say it's an 8" as listed on their site and has no offset. I'll gain a 6mm offset with the 17x9.5 and I've read on a few forums that this wheel has a 5.5" BS. I've seen numbers of 4.5 and 4.75 BS for the 18x8.
Assuming I'm starting 1/2" wider on each side because of the 70 model 12 bolt then I'm already at that disadvantage. Would the 17x9.5 with a 5.5"BS and a 6mm offset buy me any more clearance?
Found this on the Chevelle website:
How to Measure Wheel BackSpace:
Items required to measure wheel backspace:
Tape measure
Straight edge
Wheel w/o tire (preferred)
![Image]()
The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2",3", & 4" backspace.
Off Set: Measuring Wheel Offset
To calculate offset you'll need the following measurements:
Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)
Subtract:
Wheel center line from Wheel backspace to get offset. If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive
![Image]()
Tip:
To convert from inches to mm multiply by 25.4
To convert from mm to inches divide by 25.4
Backspace to Offset Conversion Chart
The table on the below is a quick reference for finding offset, pick the rim width and follow the row over to the backspace of your wheel.
![Image]()
If you look at the chart above then the offset of 5.5" agrees with the offset of 6mm.
So... using the chart above on my 18x8 having a 0 offset then it should have a 4.5" backspace and I should gain about 1" per side inset/backspacing going with a 17x9.5 and 5.5" BS... if my math is correct. But then add in a 1.5" wider wheel and I'm actually adding .5" to what I have now?
UPDATE: Called Discount Tire direct:
17x8 with a 6mm offset has a 4.75" BS
17x9.5 with a 6mm offset has a 5.50" BS
18x8 with a 0mm offset has a 4.50" BS
What I think I need is:
17x9.5 with a 6-6.5" BS or more likely... a 17x8 with a 5.50" BS.
I'm also going to check the numbers on this rear end to verify what it is.
Someone check me on this.
Keep in mind the wheels/tires are mounted on the car so my measurements aren't easy to make.
My 69 came with the MB Old School wheels and Kumho Ecsta ASX tires which are a pretty good Z rated tire.
Fronts:
17x8 (haven't measured but I'm sure that's what they are)
245/45/17
Rear:
18x9, now Discount Tire only shows an 18x8 with a 5x4.75 bolt pattern but my measurement shows about 9" wide, tire is about 11" wide so the wheel might even be a 9.5.
Here's the problem. I get a bit of rub, yes the rear suspension or at least the crappy air shocks need to go... but here's the problem, the rear is a 12 bolt out of a 70 model Camaro which if I understand correctly is about 1" wider. So figure 1/2" per side too wide.
Second problem: Discount Tire doesn't show backspacing but does show offset on a page I found.
http://www.discounttiredirect.com/direct/wheels/mb_wheels/product/byName.do?tmn=Old School
So, the fronts never rub, I'm happy there but the rears are obviously off and quite frankly I'd be happier with a 17" wheel and more sidewall.
The 18x8 they list with a 5x4.75 BP has a 0 offset.
The 17x9.5 has an offset of 6 and the 17x8 has options for an offset of 0 or 6.
So, let's assume that my measurement is off some on the 18 width, say it's an 8" as listed on their site and has no offset. I'll gain a 6mm offset with the 17x9.5 and I've read on a few forums that this wheel has a 5.5" BS. I've seen numbers of 4.5 and 4.75 BS for the 18x8.
Assuming I'm starting 1/2" wider on each side because of the 70 model 12 bolt then I'm already at that disadvantage. Would the 17x9.5 with a 5.5"BS and a 6mm offset buy me any more clearance?
Found this on the Chevelle website:
How to Measure Wheel BackSpace:
Items required to measure wheel backspace:
Tape measure
Straight edge
Wheel w/o tire (preferred)
The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace. The above photo shows three wheels with 2",3", & 4" backspace.
Off Set: Measuring Wheel Offset
To calculate offset you'll need the following measurements:
Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)
Subtract:
Wheel center line from Wheel backspace to get offset. If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive
Tip:
To convert from inches to mm multiply by 25.4
To convert from mm to inches divide by 25.4
Backspace to Offset Conversion Chart
The table on the below is a quick reference for finding offset, pick the rim width and follow the row over to the backspace of your wheel.
If you look at the chart above then the offset of 5.5" agrees with the offset of 6mm.
So... using the chart above on my 18x8 having a 0 offset then it should have a 4.5" backspace and I should gain about 1" per side inset/backspacing going with a 17x9.5 and 5.5" BS... if my math is correct. But then add in a 1.5" wider wheel and I'm actually adding .5" to what I have now?
UPDATE: Called Discount Tire direct:
17x8 with a 6mm offset has a 4.75" BS
17x9.5 with a 6mm offset has a 5.50" BS
18x8 with a 0mm offset has a 4.50" BS
What I think I need is:
17x9.5 with a 6-6.5" BS or more likely... a 17x8 with a 5.50" BS.
I'm also going to check the numbers on this rear end to verify what it is.
Someone check me on this.
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