TireFitLab

255/35 R19

What size is 255/35 R19?

255/35 R19 has an overall diameter of about 26.03 in, a section width of 10.04 in and a sidewall height of 3.51 in. It turns roughly 775 times per mile. Below are the exact figures plus plus/minus sizes that stay within the selected diameter tolerance.

Geometric comparison

225/45 R18 stays within the configured tolerance for 255/35 R19: -0.2% diameter and -0.2% speedometer effect.

Geometric comparison
Metric This size: 255/35 R19 Alternative: 225/45 R18 Difference Verdict
Overall diameter 26.03 in 25.97 in -0.2% Within tolerance
Section width 10.04 in 8.86 in -1.18 in Computed difference
Sidewall height 3.51 in 3.99 in +0.47 in Computed difference
Circumference 81.77 in 81.59 in -0.2% Within tolerance
Speedo 0.0% -0.2% -0.2% Within tolerance

Seasonal check

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What this geometry means

255/35 R19 has a low-profile proportion. The marking combines nominal section width 10.04 in, sidewall ratio 35% and rim diameter 19 inches. One sidewall is 3.51 in; both sidewalls make up 27% of the 26.03 in overall diameter, while the rim makes up 73%.

The closest diameter entry is 225/45 R18 at -0.2%. Relative to 255/35 R19, it changes nominal section width by -1.18 in, each sidewall by +0.47 in and radius by -0.03 in.

At the nominal 81.77 in circumference, 1,000 rotations cover 2.08 km (1.29 mi); the inverse rates are 481/km and 775/mi.

Width endpoints in that set are 205/55 R17 (-1.97 in) and 245/45 R17 (-0.39 in) relative to 255/35 R19.

Curated alternatives: 12 sizes, spanning -1.3% to +1.1% in nominal diameter versus 255/35 R19.

Section-width mix versus 255/35 R19: 12 narrower, 0 equal-width and 0 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 26.03 in
Section width 10.04 in
Sidewall height 3.51 in
Circumference 81.77 in
Revolutions 481 /km · 775 /mi

In-tolerance sizes

Alternative sizes that stay within the selected diameter tolerance:

In-tolerance sizes
Size Diameter Speedo Verdict
225/45 R18 -0.2% -0.2% ✓ OK
215/60 R16 +0.5% +0.5% ✓ OK
205/55 R17 -0.6% -0.6% ✓ OK
225/50 R17 -0.7% -0.7% ✓ OK
205/70 R15 +1.0% +1.0% ✓ OK
245/35 R19 -1.1% -1.1% ✓ OK
225/55 R16 -1.1% -1.1% ✓ OK
215/55 R17 +1.1% +1.1% ✓ OK
235/45 R18 +1.1% +1.1% ✓ OK
245/40 R18 -1.2% -1.2% ✓ OK
205/60 R16 -1.3% -1.3% ✓ OK
245/45 R17 -1.3% -1.3% ✓ OK

Compare sizes

Looks valid
Looks valid
Units
Requires verificationWithin tolerance · Diameter -0.2% (-0.06 in) · US (~3%)
  • Requires verification · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter -0.2% · Ride-height change -0.03 in.
  • Speedometer reads high · 60 mph → 59.9 mph.
  • Sidewall +0.47 in · Width -1.18 in.
Diameter-0.2%-0.06 in
Speedo @ 60-0.2%60 mph → 59.9 mph
Sidewall+0.47 inWidth -1.18 in
Ride-height change-0.03 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
26.03 in 25.97 in-0.06 in
Sidewall
3.51 in 3.99 in+0.47 in
Width
10.04 in 8.86 in-1.18 in
Circumference
81.77 in 81.59 in-0.2%
Revs / mile
775 777
Speedo @ 60
60 mph 59.9 mph-0.2%
Ride-height change
0.00 in -0.03 in
True distance per 100 indicated
100 mi 99.8 mi-0.2%
Δ⌀ -0.06 inΔ↔ -1.18 in
  • Current — 255/35 R19
  • New — 225/45 R18
  • Grounded to the road: the axle rises -0.03 in.

Result report

255/35 R19 225/45 R18 · Requires verification · Within tolerance

Plan budget for this size: 225/45 R18

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Plan budget for this size
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Budget$85–$120Per tireMid-range$110–$160Per tirePremium$160–$225Per tire

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

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 255/40R18+0.0%+0.0%
OE 255/35R19+0.0%+0.0%
+1″ 255/30R20-0.0%-0.0%

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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