35x12.50 R20
What size is 35x12.50 R20?
35x12.50 R20 has an overall diameter of about 35.00 in, a section width of 12.50 in and a sidewall height of 7.50 in. It turns roughly 576 times per mile. Below are the exact figures plus plus/minus sizes that stay within the selected diameter tolerance.
- Overall diameter: 35.00 in.
- Section width: 12.50 in.
- Sidewall height: 7.50 in.
- Revolutions: 358 /km · 576 /mi.
- In-tolerance sizes: 35x12.50 R17 (+0.0%).
Geometric comparison
35x12.50 R17 stays within the configured tolerance for 35x12.50 R20: 0.0% diameter and 0.0% speedometer effect.
| Metric | This size: 35x12.50 R20 | Alternative: 35x12.50 R17 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 35.00 in | 35.00 in | 0.0% | Within tolerance |
| Section width | 12.50 in | 12.50 in | 0.00 in | Computed difference |
| Sidewall height | 7.50 in | 9.00 in | +1.50 in | Computed difference |
| Circumference | 109.96 in | 109.96 in | 0.0% | Within tolerance |
| Speedo | 0.0% | 0.0% | 0.0% | Within tolerance |
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tires are worn or the replacement size changes diameter.
What this geometry means
35x12.50 R20 has a mid-range sidewall proportion. The marking directly specifies a 35.00 in nominal overall diameter, a 12.50 in section and a 20-inch rim. One sidewall is 7.50 in; both sidewalls make up 43% of the diameter, while the rim makes up 57%.
At the nominal 109.96 in circumference, 1,000 rotations cover 2.79 km (1.74 mi); the inverse rates are 358/km and 576/mi.
Section-width mix versus 35x12.50 R20: 0 narrower, 2 equal-width and 0 wider entries.
The closest diameter entry is 35x12.50 R17 at +0.0%. Relative to 35x12.50 R20, it changes nominal section width by +0.00 in, each sidewall by +1.50 in and radius by +0.00 in.
Curated alternatives: 2 sizes, spanning +0.0% to +0.0% in nominal diameter versus 35x12.50 R20.
Width endpoints in that set are 35x12.50 R17 (+0.00 in) and 35x12.50 R18 (+0.00 in) relative to 35x12.50 R20.
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
| Overall diameter | 35.00 in |
|---|---|
| Section width | 12.50 in |
| Sidewall height | 7.50 in |
| Circumference | 109.96 in |
| Revolutions | 358 /km · 576 /mi |
In-tolerance sizes
Alternative sizes that stay within the selected diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 35x12.50 R17 | +0.0% | +0.0% | ✓ OK |
| 35x12.50 R18 | +0.0% | +0.0% | ✓ OK |
Compare sizes
- High fitment risk · 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 +1.50 in · Width +0.00 in.
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.
MethodologyBefore 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
- 35.00 in 35.00 in+0.00 in
- Sidewall
- 7.50 in 9.00 in+1.50 in
- Width
- 12.50 in 12.50 in+0.00 in
- Circumference
- 109.96 in 109.96 in+0.0%
- Revs / mile
- 576 576
- 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%
- Current —
35x12.50 R20 - New —
35x12.50 R17 - Grounded to the road: the axle rises +0.00 in.
Result report
35x12.50 R20 35x12.50 R17 · High fitment risk · Within tolerance
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Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
In-tolerance alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
OE 345/55R20 | -0.2% | -0.2% | |
+1″ 355/50R21 | -0.1% | -0.1% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- Section width guide
- Aspect ratio guide
- Rim diameter 20"
- Load index chart
- Speed rating chart
- Rim width and tire fitment guide
- Wheel offset guide
- Wheel spacers guide
- Tire pressure for heavy loads and towing
- Technical check
- 2026-07-22
- Content updated
- 2026-07-22
What changed
- Added a localized engine-derived geometry signature and matching Markdown narrative.