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255 80r22 5 conversion


Size Conversions - Goodyear RV

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Popular Alternative Tire Sizes

For an equivalent size, a HIGHER load range tire can always be substituted:

  • ST225/75R15 LR D Marathon substituted for ST225/75R15 LR C Marathon
  • Match inflation pressure to load carrying requirements using load and inflation tables

Some manufacturers use slightly different size designations. Popular RV tire size equivalents:

  • 235/80R22.5 = 245/75R22.5
  • 255/80R22.5 = 265/75R22.5
  • 275/80R22.5 = 295/75R22.5

Converting from 8R19.5 to 225/70R19.5:

Many RV owners are converting from 8R19.5 to the newer, more popular 225/70R19.5 size. In most cases this can be done successfully. The following guidelines should be consulted to determine if this conversion can work for you. Before making a final decision to convert, we recommend contacting your local Goodyear RV tire retailer to verify that all considerations have been met.

Advantages = more even wear, improved stability

Conversion Checklist (8R19.5 to 225/70R19.5 only):

  1. Check with the vehicle manufacturer to ensure approval of the tire/wheel clearance and fitment
  2. Verify that rim width is compatible to run the 225/70R19.5
  3. A wider minimum dual spacing is required and should be confirmed
  4. Due to a tire diameter and static loaded radius difference there will be an increased number of revolutions per mile which will mean that the vehicle speedometer and odometer will read approximately 2.5% high. Because the difference in RPM is less than 3%, however, no changes to gearing would generally be required.

Tire Size Type LR RIM Min.
Dual
Spacing		 Width Tire
Diameter		 Static
Load		 RPMs Speed Load Inflation
Single   Dual
225/70R19.5 G670 RV F 6.00RW,
6.75,
6.75RW		 9.7 8.6 32 14.9 644 75

3640 lb
@95 psi

3415 lb
@95 psi
225/70R19. 5 G670 RV F 6.00RW,
6.75,
6.75RW		 9.7 8.6 32 14.9 644 75

3640 lb
@95 psi

3415 lb
@95 psi

255/80 R22.5 vs 265/75 R22.5 Tire Size Comparison Table with Graphic Visualization (inch difference)

Original tire size
/ 253035404550556065707580859095100 R 121314151617181920212222.52324

Calculate

135145155165175185195205215225235245255265275285295305315325335345355365375385395 / 253035404550556065707580859095100 R 121314151617181920212222. 52324

New tire size

CM INCHES


Parameter Old New Difference
Overall diameter: - - -
Section width - - -
Circumference - - -
Sidewall height - - -
Revs per mile: - - -
Clearance -
Result: -

If your speedometer reads:

Real speed is:

Size difference between 255/80 R22.

5 and 265/75 R22.5 tires.

In the tire comparison table above, you can see a detailed calculation of the size difference between 255/80 R22.5 and 265/75 R22.5 tire. The calculation results are presented in the form of visual infographics, on which tire with size 255/80 R22.5 is on top, and tire with size 265/75 R22.5 below. Both in the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 255/80 R22.5 and tire 265/75 R22.5 is significant. Calculate the difference in inches.

If you want to compare other tire sizes, then select their sizes in the drop-down fields and click on the green button. The online wheel calculator will then display the new results.

Infographics

Side comparison Frontal comparison

See also:

Tires | av134.

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