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Discussion Starter #1
Looking at trying some drag radials on our 1969 Camaro. We've always raced the car on the F70-15 Polyglass tires w/ 15x7 rallys so what size would work for me?

The F70s are roughly 27" tall, and the car is an automatic. Just looking for something consistent and to save my good Polyglass tires for events when they're required. Is it gonna be an issue mixing my bias ties on the front with radials on the rear?

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Hoosier 275-15's are great but you will need 8" wide wheels with 4.5" to 4.75" backspace on the rear.. 255-15's will work also and have more clearance.
On the front, never mix bias ply with radials. I have 225's on 8" rims with 4.5" backspace. 235's will fit but may rub.
Any of these drag radials will work :
 

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The FR70-15 tire is equivalent to a 205/75R15 or 215/70R15. It may have nearly same diameter as 225/65R15, but will have a narrower section width and tread patch

I had to Google it.

So... 8.2" wide x 27.3"tall approximately.

I would not run radials on the rear with bias on the front....I've done it the other way around with no issues.

So what kind of times you running ?
Maybe some MT Sportsman Pro's (bias ply) 28X10.50-15LT on some 8" wheels ;)
 

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28x10.5 sounds big for a 69 unless it’s jacked up. 255/60 with stock suspension is about all of it.
 

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Discussion Starter #6
Here are the specs for my current tires.


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A 275 is 10.8" wide...Can't you fit a 275 on a 69 ?

I thought they fit....
 

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I put Hoosier 275 60 15 slicks on my 69 Z. They looked killer, and technically, I guess they fit. However, they were so close to rubbing I was afraid to drive it. I sold them. I have 255 60 15 on there right now. They have never rubbed.

Not every 275 60 15 tire is exactly the same size. There is some wiggle room, so they vary slightly from one manufacturer to another. Also, 275 mm (10.826 inches) section width does not mean 275 mm tread width. Those also vary from one manufacturer to another.
 

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Yes, the only problem with a '69 is the qtr panel covers some of the tire, compared to '67 & '68 where the whole tire is exposed.
It is limited by tread width and wheel backspacing.
 

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Discussion Starter #10
I'm not concerned about maximum tire width. I would just like a tire that's close in height so I dont have to regear and that will hook consistently.

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They do make 26 and 28 inch tall by 9 inches wide slicks....but I'm not finding any 27 inch tall
 
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