TireFitLab

265/65 R17

What size is 265/65 R17?

265/65 R17 has an overall diameter of about 30.56 in, a section width of 10.43 in and a sidewall height of 6.78 in. It turns roughly 660 times per mile. Below are the exact figures plus plus/minus sizes that stay within the selected diameter tolerance.

Geometric comparison

245/65 R18 stays within the configured tolerance for 265/65 R17: -0.1% diameter and -0.1% speedometer effect.

Geometric comparison
Metric This size: 265/65 R17 Alternative: 245/65 R18 Difference Verdict
Overall diameter 30.56 in 30.54 in -0.1% Within tolerance
Section width 10.43 in 9.65 in -0.79 in Computed difference
Sidewall height 6.78 in 6.27 in -0.51 in Computed difference
Circumference 96.02 in 95.94 in -0.1% Within tolerance
Speedo 0.0% -0.1% -0.1% Within tolerance

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What this geometry means

265/65 R17 has a taller-sidewall proportion. The marking combines nominal section width 10.43 in, sidewall ratio 65% and rim diameter 17 inches. One sidewall is 6.78 in; both sidewalls make up 44% of the 30.56 in overall diameter, while the rim makes up 56%.

Curated alternatives: 12 sizes, spanning -0.7% to +1.4% in nominal diameter versus 265/65 R17.

Width endpoints in that set are 245/65 R18 (-0.79 in) and 285/40 R22 (+0.79 in) relative to 265/65 R17.

At the nominal 96.02 in circumference, 1,000 rotations cover 2.44 km (1.52 mi); the inverse rates are 410/km and 660/mi.

The closest diameter entry is 245/65 R18 at -0.1%. Relative to 265/65 R17, it changes nominal section width by -0.79 in, each sidewall by -0.51 in and radius by -0.01 in.

Section-width mix versus 265/65 R17: 2 narrower, 5 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 30.56 in
Section width 10.43 in
Sidewall height 6.78 in
Circumference 96.02 in
Revolutions 410 /km · 660 /mi

In-tolerance sizes

Alternative sizes that stay within the selected diameter tolerance:

In-tolerance sizes
Size Diameter Speedo Verdict
245/65 R18 -0.1% -0.1% ✓ OK
265/60 R18 -0.1% -0.1% ✓ OK
265/70 R16 +0.1% +0.1% ✓ OK
245/70 R17 -0.2% -0.2% ✓ OK
265/50 R20 -0.4% -0.4% ✓ OK
265/45 R21 -0.6% -0.6% ✓ OK
275/45 R21 +0.6% +0.6% ✓ OK
265/40 R22 -0.7% -0.7% ✓ OK
275/55 R19 +1.1% +1.1% ✓ OK
285/40 R22 +1.4% +1.4% ✓ OK
31x10.50 R15 +1.4% +1.4% ✓ OK
31x10.50 R16 +1.4% +1.4% ✓ OK

Compare sizes

Looks valid
Looks valid
Units
Requires verificationWithin tolerance · Diameter -0.1% (-0.02 in) · US (~3%)
  • Requires verification · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter -0.1% · Ride-height change -0.01 in.
  • Speedometer reads high · 60 mph → 60.0 mph.
  • Sidewall -0.51 in · Width -0.79 in.
Diameter-0.1%-0.02 in
Speedo @ 60-0.1%60 mph → 60.0 mph
Sidewall-0.51 inWidth -0.79 in
Ride-height change-0.01 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
30.56 in 30.54 in-0.02 in
Sidewall
6.78 in 6.27 in-0.51 in
Width
10.43 in 9.65 in-0.79 in
Circumference
96.02 in 95.94 in-0.1%
Revs / mile
660 660
Speedo @ 60
60 mph 60.0 mph-0.1%
Ride-height change
0.00 in -0.01 in
True distance per 100 indicated
100 mi 99.9 mi-0.1%
Δ⌀ -0.02 inΔ↔ -0.79 in
  • Current — 265/65 R17
  • New — 245/65 R18
  • Grounded to the road: the axle rises -0.01 in.

Result report

265/65 R17 245/65 R18 · Requires verification · Within tolerance

Plan budget for this size: 245/65 R18

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Plan budget for this size
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Budget$100–$140Per tireMid-range$130–$185Per tirePremium$185–$260Per tire

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

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 285/65R16+0.1%+0.1%
OE 265/65R17+0.0%+0.0%

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