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Best tire size for a 69, 17 or 18 inch?

 
Old 05-14-2018, 03:37 AM
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gwgwgw
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Default Best tire size for a 69, 17 or 18 inch?

I am taking a fresh look at tire sizes for my 69, which has a stock body.

The reason I am doing this a year later is checking on tire availability.
I did a project on a different type of car a few years back and I designed it to have a certain size 15 inch tire. A couple of years later no one was making that size anymore. So I want to take a look at tire availability at this point a year into my build of a 69

It was my understanding that the original 15 inch tires were approximately 27 inch in diameter

I also remember if I moved to seventeen inch wheels, 255/50 - 17 would be the maximum size to be able to fit under the wheel wells, with possibly having to move down to 245. I also see other ones in the 45 aspect ratio as well

With the limited number of performance tires being made in this size
What about 18 inch sizes?
What size 18 inch that would fit the 69 without rubbing

Thanks
Glenn in San Diego

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Old 05-14-2018, 05:31 AM
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CraigH
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Originally Posted by gwgwgw View Post
I am taking a fresh look at tire sizes for my 69, which has a stock body.

The reason I am doing this a year later is checking on tire availability.
I did a project on a different type of car a few years back and I designed it to have a certain size 15 inch tire. A couple of years later no one was making that size anymore. So I want to take a look at tire availability at this point a year into my build of a 69

It was my understanding that the original 15 inch tires were approximately 27 inch in diameter

I also remember if I moved to seventeen inch wheels, 255/50 - 15 would be the maximum size to be able to fit under the wheel wells, with possibly having to move down to 245. I also see other ones in the 45 aspect ratio as well

With the limited number of performance tires being made in this size
What about 18 inch sizes?
What size 18 inch that would fit the 69 without rubbing

Thanks
Glenn in San Diego
Hi Glenn

I would go to 18s as there is more available choice and you still have a reasonable size sidewall.

I run 245/45/18 front and 255/45/18 rear

So the fronts are just under And rears just over the size of the original 215/70/15s

You will then need to adjust ride height as it becomes more visible when you change the wheels and gaps look worse.

I would consider 235 on the front only for the reason it gets less tramline effect (another byproduct of lowering and larger width tyres.)

Have never had them scrape or hit bodywork, even when low. But mine is a 71 with slightly different wheel arches.

I stuck with 4 backspace on 8 rims to ensure they were offset correctly in the guards.

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Old 05-14-2018, 12:46 PM
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Originally Posted by CraigH View Post
Hi Glenn

I would go to 18s as there is more available choice and you still have a reasonable size sidewall.

I run 245/45/18 front and 255/45/18 rear

So the fronts are just under And rears just over the size of the original 215/70/15s

You will then need to adjust ride height as it becomes more visible when you change the wheels and gaps look worse.

I would consider 235 on the front only for the reason it gets less tramline effect (another byproduct of lowering and larger width tyres.)

Have never had them scrape or hit bodywork, even when low. But mine is a 71 with slightly different wheel arches.

I stuck with 4 backspace on 8 rims to ensure they were offset correctly in the guards.
Thanks so much

Do you have a picture?

Glenn
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Old 05-14-2018, 01:06 PM
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Glenn,

I think that you will find the answer is subjective however Craig makes some very fine points above.

I went with 17" on mine for two reasons: I got an incredible deal on the wheels and I wanted to have as much sidewall showing without hugely impacting the handling.

I will say that if I did not score the deal on these wheels I would likely buy 18's for all of the reasons mentioned above but primarily for future availability for quality rubber.

Good luck in your search!
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Old 05-14-2018, 01:17 PM
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Originally Posted by PainfullySlow View Post
Glenn,

I think that you will find the answer is subjective however Craig makes some very fine points above.

I went with 17" on mine for two reasons: I got an incredible deal on the wheels and I wanted to have as much sidewall showing without hugely impacting the handling.

I will say that if I did not score the deal on these wheels I would likely buy 18's for all of the reasons mentioned above but primarily for future availability for quality rubber.

Good luck in your search!

Yep, I definitely like the look of the 17's over the 18's and thus my agony LOL
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Old 05-14-2018, 03:15 PM
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resdoggie
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How wide a wheel do you want? That also dictates tire size that will fit. My rears are 18x9-1/2", 5-1/4" BS with a 275/40-18 tire. It fits flush with the fender lip. It may or not have interfered with the parking brake bracket on the trailing arm but I relocated it to the top of the trailing arm just to be sure.
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Old 05-14-2018, 05:41 PM
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63Corvette
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Tires are NOT cosmetic!!!
For what USAGE are you looking for tires: track, show, street, looks only?
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Old 05-14-2018, 06:05 PM
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Some images








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Old 05-15-2018, 02:17 AM
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Originally Posted by 63Corvette View Post
Tires are NOT cosmetic!!!
For what USAGE are you looking for tires: track, show, street, looks only?
The car will be used mostly on the street in good weather.
The application is canyon carving on the back roads here in the Southern California mountains and desert
I am looking for a performance tire that is high speed rated
NOT looking for an all season tire
That is why I didn't want to stick with 15's and not seeing a great selection at 17 inch

Thanks
Glenn
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Old 05-15-2018, 02:20 AM
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Originally Posted by resdoggie View Post
How wide a wheel do you want? That also dictates tire size that will fit. My rears are 18x9-1/2", 5-1/4" BS with a 275/40-18 tire. It fits flush with the fender lip. It may or not have interfered with the parking brake bracket on the trailing arm but I relocated it to the top of the trailing arm just to be sure.
Because it is a 69 it doesn't have as much room under the fender wells

I was thinking 8 inch all around but possibly a wee bit larger in the back
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Old 05-15-2018, 02:25 AM
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I have run 8.5" 245/45/18 front and 9" 255/45/18 rear on my 70 model
I now have 9.5" 275/40/19 front and 10" 285/40/19 rear only when up to 19 to clear brakes.
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Old 05-15-2018, 02:40 AM
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Mine has been pretty happy with 255 in front and 285 in back on 17s
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Old 05-15-2018, 03:01 AM
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The 18" wheel thread has a lot of pictures. Mine are 18x8 stock backspace, 255-45-18 Goodyear



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Old 05-15-2018, 03:43 AM
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17" has the more classic look as you mention, but there is more tyres available in 18", it's a toss up... I now run 17" on the street because I prefer the look (I run 17x9.5, currently using a 285/40R17 Continental ExtremeContact Sport tyre, but previously ran 255/50R17 Nitto Invos) and 18" on the track for cheap (relatively speaking!) wide semislick tyres (18x10, currently with 295/30R18 Nankang AR1 semislicks).

For your use, personally I would run 17" wheels, even with a slightly shorter sidewall they look more "right" to me, though I have to admit the look of the 18" track wheels on my car is growing on me.
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Old 05-15-2018, 09:53 AM
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18x9 with 4.5 BS. Continental Extreme Contact, they are 26in diameter.
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Old 05-15-2018, 12:43 PM
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Originally Posted by terrys6t8roadster View Post
18x9 with 4.5 BS. Continental Extreme Contact, they are 26in diameter.
Tire size?
Any rubbing ?

Thanks
Glenn
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Old 05-15-2018, 01:39 PM
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!969, 255/45/17, BFG G-Force Comp 2 Summer only
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Old 05-15-2018, 03:00 PM
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Originally Posted by gwgwgw View Post
Tire size?
Any rubbing ?

Thanks
Glenn
255/40zr18, 0 rubbing. T
Rears are 18x10-5.0 BS with offset TA, but did install the fronts [18x9] on the rear of a original suspension 68 coupe with no trouble.

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Old 05-15-2018, 07:51 PM
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I'm going through the process of finding wheels I like right now and trying to decide between 18 or 17 as well.

One question I have is, how much of a pain is it to relocated the Parking brake bracket? I am rebuilding the parking brake this weekend anyway.

It is really hard to find 17x9.5 with 4.5" backspace!!!
Any good recommendations for online wheel places for them?
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Old 05-15-2018, 08:46 PM
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I went with 17x8" Superlites with a 4" back space and 235/55R17 Firestone Firehawks.
Great fit, no rubbing anywhere, and they perform great.


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