285/65R18 vs 295/70R18

295/70R18 is 1.7" taller than 285/65R18 (5.1%)

Diameter difference+5.13%diameter 32.59" → 34.26"
285/65R18295/70R18
285/65R18295/70R18Difference
Overall diameter32.59"34.26"+1.67"
Section width11.22"11.61"+0.39"
Sidewall height7.29"8.13"+0.84"
Circumference102.4"107.6"+5.3"
Revolutions per mile619589−30
Wheel diameter18"18"±0"

Speedometer

ShowsActualDiff
30 mph31.5 mph+1.5
45 mph47.3 mph+2.3
60 mph63.1 mph+3.1
70 mph73.6 mph+3.6
80 mph84.1 mph+4.1

Gear ratio to match

CurrentEquivalent
3.423.60
3.553.73
3.733.92
4.104.31

295/70R18 is 1.67" taller than 285/65R18, a +5.13% change in diameter. That is more than the 3% many tire shops use as a limit, so plan on recalibrating the speedometer and checking ABS and stability control.

Ground clearance changes by 0.84" (half the diameter change), and the tire needs 0.84" more room above it.

295/70R18 is 0.39" wider. On the same wheel offset about half of that, 0.20", moves toward the suspension and half toward the fender.

Both fit a 18" wheel; the sidewall is 0.84" taller on 295/70R18.

Details: 285/65R18 in inches · 295/70R18 in inches · change sizes in the calculator

FAQ

What is the difference between 285/65R18 and 295/70R18?

295/70R18 is 1.67" taller (+5.13%) and 0.39" wider than 285/65R18.

Will 295/70R18 change my speedometer?

Yes, by +5.13%. When the speedometer shows 60 mph you would be going 63.1 mph.

Can I replace 285/65R18 with 295/70R18?

It is a +5.1% diameter change, larger than the common 3% guideline, so check clearance and plan to recalibrate.