Steering feel
Balanced, OEM-style response
A familiar OEM feel — predictable inputs without trade-offs.
Tire size meaning
245/45 R20
What the numbers on a 245/45 R20 tire actually mean — width, sidewall, construction and rim — explained in plain language with real-world driving context.
Direct answer
What does 245/45 R20 mean?
245/45 R20 is a metric tire size: 245 mm wide, a sidewall 45% of that width (110 mm), radial construction, fitted to a 20-inch wheel. Overall diameter ≈ 729 mm.
- 245
- Section width in mm (sidewall to sidewall).
- 45
- Aspect ratio — sidewall is 45% of width (110 mm).
- R
- Radial construction — the modern layered build.
- 20
- Wheel rim diameter in inches (508 mm).
Ø 729 mm · 28.68″ · 437 revs/km
Dimensional breakdown
- Section width
- 245 mm
- Aspect ratio
- 45%
- Sidewall height
- 110.3 mm
- Rim diameter
- 20″ (508.0 mm)
- Overall diameter
- 729 mm
- Circumference
- 2.289 m
- Revs per km
- 437
- Construction
- Radial (R)
What 245/45 R20 feels like on the road
A 245/45 R20 tire is a low-profile sporty tire. With a sidewall of 110 mm, it gives precise turn-in with a reasonable ride compromise — typical for sport sedans and hot hatches.
The 245 mm contact width delivers maximum contact patch for high-performance and SUV applications. Combined with a 20-inch wheel, this size is most commonly found on performance cars, premium sedans and full-size SUVs.
At highway speed each tire completes about 437 revolutions per kilometre — the figure your speedometer and ABS were calibrated against if 245/45 R20 is the OEM specification.
Common alternatives to 245/45 R20
Sizes within ±3% overall diameter — generally safe swaps for speedometer accuracy and clearance. Click any size to open a full side-by-side comparison.
Driver feel · telemetry
What 245/45 R20 usually feels like
A driver-perspective read on this size — steering, comfort, highway stability and rough-road behavior.
Ride comfort
Comfortable daily ride
A balanced compromise — bumps muted, steering still precise.
Highway stability
Planted at highway speed
Wider contact patch resists crosswinds and tramlining — strong straight-line confidence.
Pothole comfort
Reasonable impact protection
Enough sidewall to protect the rim from typical urban hits.
Sporty vs OEM tone
Balanced everyday character
A factory-style balance between feel, comfort and grip.
Sidewall110 mm
Ø729 mm
Width245 mm
Revs/km437
Related tire sizes for 245/45 R20
Explore neighbouring sizes by intent — similar, wider, lower-profile, OEM-safe, or aggressive. Each link opens a full side-by-side comparison.