265/70 R17 vs 285/70 R17

How much larger is 285/70R17 than 265/70R17?

Both sizes use 17-inch wheels, but 285/70R17 adds 20 mm nominal width and 28 mm overall diameter (+3.49%). Sidewall height rises 14 mm because 70% is applied to a wider tire. This exceeds the calculator’s ±3% preset; that preset is a geometry screen, not a legal rule or an installation verdict. Nominal radius rises 14 mm, which does not prove actual loaded ground clearance. Add wheel width, ET and measured gaps below; verify full steering and suspension travel, ratings and vehicle approval before choosing the replacement.

Geometric comparison

Geometric comparison
Metric This size: 265/70 R17 Alternative: 285/70 R17 Difference Verdict
Overall diameter 31.61 in 32.71 in +3.5% Too tall
Section width 10.43 in 11.22 in +0.79 in Computed difference
Sidewall height 7.30 in 7.85 in +0.55 in Computed difference
Circumference 99.29 in 102.76 in +3.5% Too tall
Speedo 0.0% +3.5% +3.5% Outside tolerance

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Editorial preset

These are TireFitLab editorial diameter-screening presets. Regional names choose a preset, not a national legal limit, ETRTO rule or vehicle approval. The AWD preset does not establish an allowable drivetrain mismatch. Use the exact vehicle and tyre manufacturer instructions; nominal geometry alone cannot approve fitment.

High fitment riskOut of tolerance · Diameter +3.5% (+1.10 in) · US preset (±3%)
  • High fitment risk · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter +3.5% · Ride-height change +0.55 in.
  • Speedometer reads low · 60 mph → 62.1 mph.
  • Sidewall +0.55 in · Width +0.79 in.
Diameter+3.5%+1.10 in
Speedo @ 60+3.5%60 mph → 62.1 mph
Sidewall+0.55 inWidth +0.79 in
Ride-height change+0.55 inDiameter ÷ 2
How this result is calculated

Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check vehicle placard approval, load/speed rating, rim-width range, wheel-arch, suspension or brake clearance.

Methodology

Before fitting

  • Check the vehicle placard and owner’s manual first.
  • Match or exceed the required load index and speed rating.
  • Confirm rim-width range, bolt pattern, hub bore, offset and fasteners.
  • Inspect wheel-arch, suspension and brake clearance under real vehicle load.
  • Check TPMS, cold pressure and local roadworthiness rules.
Diameter
31.61 in 32.71 in+1.10 in
Sidewall
7.30 in 7.85 in+0.55 in
Width
10.43 in 11.22 in+0.79 in
Circumference
99.29 in 102.76 in+3.5%
Revs / mile
638 617
Speedo @ 60
60 mph 62.1 mph+3.5%
Ride-height change
0.00 in +0.55 in
True distance per 100 indicated
100 mi 103.5 mi+3.5%
Δ⌀ +1.10 inΔ↔ +0.79 in
  • Current — 265/70 R17
  • New — 285/70 R17
  • Grounded to the road: the axle rises +0.55 in.

Tires and wheels in one comparison

Result report

265/70 R17 285/70 R17 · High fitment risk · Out of tolerance

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Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 275/70R16-1.4%-1.4%
OE 265/70R17+0.0%+0.0%
+1″ 255/70R18+1.4%+1.4%
+2″ 275/60R19+1.2%+1.2%

265/70 R17 · 285/70 R17 · Methodology