Correct Tire Size

[442MUCH]

I think the correct factory tire size in today's measurement for the 442 is
P235 70R 15. Agree? Disagree?

[77-442]

Ken, the proper tire size is 225-70x15, it replaces the orig GR-70x15 size. I have a almost new set of 235-70x15 BFG T/A's on the car and they are too tall. BFG and Uniroyal are out of the 225-70x15 till later this summer, as I have called the factory to confirm this.

Jim

[442MUCH]

Ken, the proper tire size is 225-70x15, it replaces the orig GR-70x15 size. I have a almost new set of 235-70x15 BFG T/A's on the car and they are too tall. BFG and Uniroyal are out of the 225-70x15 till later this summer, as I have called the factory to confirm this.

Jim

Jim,

I was looking around today on the net and I believe you are right. The G70 was 27.5" diameter while the P225 70 is 27.4". Mine are 26.10", too small. I went P235 60R 15. My Vette has 255 60X15 Goodyear Eagle 1 Nascar tires:

http://img.photobucket.com/albums/v417/vttedrm/100_2918.jpg

The 442 has 15 year old Uniroyal Tiger Paw GTS

http://img.photobucket.com/albums/v417/vttedrm/100_4280.jpg
http://img.photobucket.com/albums/v417/vttedrm/DSC_1770.jpg

[zodiacblue442]

For the `73 442 the tire size was G-70x14. This was also the std. size for `74 442. In `74, 15" wheels/tires were an option, and I think std. in `75, `76, and `77. I've got P235/70R15 Goodyear Eagle GTII's on my `73 442 and like them alot. They fill up the wheel wells nice but aren't so overly large that they look out of place. I "did the math" and figured out what speedometer drive and driven gears I would need with that size tire and rear end gear ratio so my speedometer and odometer would read correctly. Looks like my engineering degree paid off after all! :D My brother had P225/70R15 BFG Radial TA's on his `77 442 and that was a great tire also. That's the size I have on my `74 Supreme too. I think the mid `70's Cutlasses are too big and heavy for 14" tires. Can't really figure out why GM would put 14's on a 4,000+ pound car.

[ragz442]

Ya Gary, 14's are just too small. I've got 2356015 up front and 2756015 in the rear of the 442, and 2456015 all around on the Supreme.

[442MUCH]

Here is a tire calculator we can use. I went to Coker.com to get the spec's for the G70 and used this calculator to figure the proper(?)...factory size, or as close as I could get.

http://store.coker.com/pages.php?pageid=4
http://store.coker.com/product.php?productid=16578&cat=0&page=1
http://www.1010tires.com/TireSizeCalculator.asp