11/21/2023 0 Comments 97 thunderbird bird tire sizeYou're right, the 225 75 14 is only 1.1 MPH slower and. I don't think there's any way to know what tires your car came with originally. Compare to the 8.50-14 and it gets worse. The calculator will tell you the dimensions of each tire and what your speed will be when your speedometer reads 65 MPH.Ĭomparing to the 8.00-14, the 215 75 is about 2.2 MPH slow and 1.0" smaller (1/2" lower to the ground) and the 225 70 is 3.1 MPH slower and 1.32" smaller (over 5/8" lower). To get the approximate dims that Coker shows for the optional 8.50-14, use 212 85 14. Use 205 85 14 and you get the approximate dims that Coker shows for the 8.00-14. The easier way is to go to Discount Tire's web site and use their tire calculator. I also used the Avon Cobra tires on my 2002 America for 30,000 miles with no troubles (more than 1 pair -) By the way: with the Avon 200/55R17 rear tire, the speedometer exactly matches the speed shown on my GPS. With that info, you can do the math and figure out what approximate size any tire is. Had it on my 2010 TBird for about 1,000 miles now. The last number, of course, is the wheel diameter in inches. From what I can gather, the old bias plys were either 78 or 80 aspect ratio. This is the height of the sidewall as a percentage of the width 70 is 70%, 75 is 75%, etc. The first number (215 or 225) is the overall width in millimeters. Some people prefer how the correct tire fills the wheel well) etc don't concern you and you just want the tire to physically work as a tire, altho the F70s on my car did rub in a few spots very slightly and they're very close in size to the radial.Tire sizes are fairly easy to read, once you know that the numbers mean. It's a suitable replacement if accuracy, correctness, looks (subjective. Tyre specifications chart for Ford Thunderbird 1997 year Standard and recommended tire sizes for Ford Thunderbird 1997 year Minimum and maximum tire sizes of Ford Thunderbird 1997 tires. The section width is about 1/3" wider, the tread width is over 1 1/4" wider and the diameter is over an inch smaller on the radial. What is the manufacturer's recommended tire size and what are the allowable tire sizes for Ford Thunderbird. I think it's one of those things that was published on a chart of "good enough for the average Joe" conversions when radials were getting common and it's just been propogated since then. The commonly held idea that a 205 75 r15 is the equivalent replacement for a 6.70 15 is just not correct. If I remember, it was reading around 65 when I was really doing about 50. Previously, with f70 15s on it when I got the car (about 27" diameter), the speedometer was off by a lot. The Thunderbird wire wheels were made by Kelsey-Hayes and came in 1' and 15' diameters. I have them on my 55 and the speedometer reads fairly accurate with original speedo gears. The tires will run somewhere around 250 each. Vintage style reproduction 6.70 15s are listed as 28.58". maybe from more modern trailer tire sizes. I'm not sure where the diameter for 6.70 15 of 27.5" came from. The original 7.50 x 14 are around 27" in outer diameter, whereas the recommended 205/75R14 radials to replace them only have an outer diameter of 26.1"-26.3" - so they are again around 3% smaller than original.Īs far as fender skirt rub and possible solutions, a good article is here: Wheel size, PCD, offset, and other specifications such as bolt pattern, thread size (THD), center bore (CB), trim levels for 1997 Ford Thunderbird. On the other hand for the '57's like mine, there's not as good a correspondence for radial replacements. A 205/70R15 however will have an outer diameter of only 26.3" so around 1" smaller in diameter (about a 4% difference). 1957 Station Wagon, Retracts, Ranchero,some 1958/59 passenger cars and 1958-61. The 14 X 5 KH wheel and 14 X 7.50 tires wheels were use on 1957 Thunderbirds to enhance ball joint & skirt clearance. The 205/75R15's have a diameter of around 27.1", so that's a pretty close match. 1957 Thunderbirds 14 X 5 Kelsey Hayes (K.H.) wheels, no slots, no rivets and welded centers, used with 14 X 7.50 tires. According to info I found, the 6.70 x 15 standard on '55's have an outer rolling diameter of around 27.25" - 27.5" depending on the manufacturer. However, the other thing to consider is the total tire diameter. exact same sectional width etc., the 205/70 may flex a little less than the 205/75 - because its shorter sidewall height will make it stiffer - that's what you buy lower profile tires for, right?
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