305/45R22 vs 33x12.50R22

33x12.50R22 is 0.2" taller than 305/45R22 (0.6%)

Diameter difference+0.59%diameter 32.81" → 33.00"
305/45R2233x12.50R22
305/45R2233x12.50R22Difference
Overall diameter32.81"33.00"+0.19"
Section width12.01"12.50"+0.49"
Sidewall height5.40"5.50"+0.10"
Circumference103.1"103.7"+0.6"
Revolutions per mile615611−4
Wheel diameter22"22"±0"

Speedometer

ShowsActualDiff
30 mph30.2 mph+0.2
45 mph45.3 mph+0.3
60 mph60.4 mph+0.4
70 mph70.4 mph+0.4
80 mph80.5 mph+0.5

Gear ratio to match

CurrentEquivalent
3.423.44
3.553.57
3.733.75
4.104.12

33x12.50R22 is 0.19" taller than 305/45R22, a +0.59% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.10" (half the diameter change), and the tire needs 0.10" more room above it.

33x12.50R22 is 0.49" wider. On the same wheel offset about half of that, 0.25", moves toward the suspension and half toward the fender.

Both fit a 22" wheel; the sidewall is 0.10" taller on 33x12.50R22.

Details: 305/45R22 in inches · 33x12.50R22 in inches · change sizes in the calculator

FAQ

What is the difference between 305/45R22 and 33x12.50R22?

33x12.50R22 is 0.19" taller (+0.59%) and 0.49" wider than 305/45R22.

Will 33x12.50R22 change my speedometer?

Yes, by +0.59%. When the speedometer shows 60 mph you would be going 60.4 mph.

Can I replace 305/45R22 with 33x12.50R22?

Often yes: the diameter change of +0.6% is within the common 3% guideline. Check the load index, speed rating and clearance.