TireFitLab

31x10.50 R16

What size is 31x10.50 R16?

31x10.50 R16 has an overall diameter of about 31.00 in, a section width of 10.50 in and a sidewall height of 7.50 in. It turns roughly 651 times per mile. Below are the exact figures plus plus/minus sizes that stay within the selected diameter tolerance.

Geometric comparison

31x10.50 R15 stays within the configured tolerance for 31x10.50 R16: 0.0% diameter and 0.0% speedometer effect.

Geometric comparison
Metric This size: 31x10.50 R16 Alternative: 31x10.50 R15 Difference Verdict
Overall diameter 31.00 in 31.00 in 0.0% Within tolerance
Section width 10.50 in 10.50 in 0.00 in Computed difference
Sidewall height 7.50 in 8.00 in +0.50 in Computed difference
Circumference 97.39 in 97.39 in 0.0% Within tolerance
Speedo 0.0% 0.0% 0.0% Within tolerance

Seasonal check

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What this geometry means

31x10.50 R16 has a taller-sidewall proportion. The marking directly specifies a 31.00 in nominal overall diameter, a 10.50 in section and a 16-inch rim. One sidewall is 7.50 in; both sidewalls make up 48% of the diameter, while the rim makes up 52%.

Curated alternatives: 12 sizes, spanning -1.6% to +1.8% in nominal diameter versus 31x10.50 R16.

Width endpoints in that set are 245/65 R18 (-0.85 in) and 285/60 R18 (+0.72 in) relative to 31x10.50 R16.

At the nominal 97.39 in circumference, 1,000 rotations cover 2.47 km (1.54 mi); the inverse rates are 404/km and 651/mi.

The closest diameter entry is 31x10.50 R15 at +0.0%. Relative to 31x10.50 R16, it changes nominal section width by +0.00 in, each sidewall by +0.50 in and radius by +0.00 in.

Section-width mix versus 31x10.50 R16: 6 narrower, 1 equal-width and 5 wider entries.

This is a nominal geometry comparison only. Vehicle clearance, wheel width and offset, load and speed ratings, and manufacturer approval still require separate checks.

Specification

Specification
Overall diameter 31.00 in
Section width 10.50 in
Sidewall height 7.50 in
Circumference 97.39 in
Revolutions 404 /km · 651 /mi

In-tolerance sizes

Alternative sizes that stay within the selected diameter tolerance:

In-tolerance sizes
Size Diameter Speedo Verdict
31x10.50 R15 +0.0% +0.0% ✓ OK
285/40 R22 -0.1% -0.1% ✓ OK
275/55 R19 -0.3% -0.3% ✓ OK
285/50 R20 +0.7% +0.7% ✓ OK
275/45 R21 -0.8% -0.8% ✓ OK
265/70 R16 -1.3% -1.3% ✓ OK
265/65 R17 -1.4% -1.4% ✓ OK
245/65 R18 -1.5% -1.5% ✓ OK
285/60 R18 +1.5% +1.5% ✓ OK
265/60 R18 -1.5% -1.5% ✓ OK
245/70 R17 -1.6% -1.6% ✓ OK
265/65 R18 +1.8% +1.8% ✓ OK

Compare sizes

Looks valid
Looks valid
Units
Requires verificationWithin tolerance · Diameter +0.0% (+0.00 in) · US (~3%)
  • Requires verification · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter +0.0% · Ride-height change +0.00 in.
  • Speedometer unchanged · 60 mph → 60.0 mph.
  • Sidewall +0.50 in · Width +0.00 in.
Diameter+0.0%+0.00 in
Speedo @ 60+0.0%60 mph → 60.0 mph
Sidewall+0.50 inWidth +0.00 in
Ride-height change+0.00 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
31.00 in 31.00 in+0.00 in
Sidewall
7.50 in 8.00 in+0.50 in
Width
10.50 in 10.50 in+0.00 in
Circumference
97.39 in 97.39 in+0.0%
Revs / mile
651 651
Speedo @ 60
60 mph 60.0 mph+0.0%
Ride-height change
0.00 in +0.00 in
True distance per 100 indicated
100 mi 100.0 mi+0.0%
Δ⌀ +0.00 inΔ↔ +0.00 in
  • Current — 31x10.50 R16
  • New — 31x10.50 R15
  • Grounded to the road: the axle rises +0.00 in.

Result report

31x10.50 R16 31x10.50 R15 · Requires verification · Within tolerance

Plan budget for this size: 31x10.50 R15

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Plan budget for this size
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Budget$105–$150Per tireMid-range$140–$200Per tirePremium$200–$285Per tire

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

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 255/80R15+0.2%+0.2%
OE 255/75R16+0.2%+0.2%

More tools

Last reviewed: 2026-07-22

Technical check
2026-07-22
Content updated
2026-07-22
What changed
  • Added a localized engine-derived geometry signature and matching Markdown narrative.
Methodology