325/60R20 vs 35x12.50R20

325/60R20 is 0.4" taller than 35x12.50R20 (1.0%)

Diameter difference−1.00%diameter 35.35" → 35.00"
325/60R2035x12.50R20
325/60R2035x12.50R20Difference
Overall diameter35.35"35.00"−0.35"
Section width12.80"12.50"−0.30"
Sidewall height7.68"7.50"−0.18"
Circumference111.1"110.0"−1.1"
Revolutions per mile570576+6
Wheel diameter20"20"±0"

Speedometer

ShowsActualDiff
30 mph29.7 mph−0.3
45 mph44.5 mph−0.5
60 mph59.4 mph−0.6
70 mph69.3 mph−0.7
80 mph79.2 mph−0.8

Gear ratio to match

CurrentEquivalent
3.423.39
3.553.51
3.733.69
4.104.06

35x12.50R20 is 0.35" shorter than 325/60R20, a −1.00% change in diameter, inside the 3% range most shops treat as a safe swap.

Ground clearance changes by 0.18" (half the diameter change), and the tire needs 0.18" less room above it.

325/60R20 is 0.30" wider. On the same wheel offset about half of that, 0.15", moves toward the suspension and half toward the fender.

Both fit a 20" wheel; the sidewall is 0.18" shorter on 35x12.50R20.

Details: 325/60R20 in inches · 35x12.50R20 in inches · change sizes in the calculator

FAQ

What is the difference between 325/60R20 and 35x12.50R20?

35x12.50R20 is 0.35" shorter (−1.00%) and 0.30" narrower than 325/60R20.

Will 35x12.50R20 change my speedometer?

Yes, by −1.00%. When the speedometer shows 60 mph you would be going 59.4 mph.

Can I replace 325/60R20 with 35x12.50R20?

Often yes: the diameter change of −1.0% is within the common 3% guideline. Check the load index, speed rating and clearance.