What is tire rolling resistance?

Rolling resistance is the energy lost per unit distance as a tire rolls. It arises primarily from hysteresis — the repeated deformation and partial recovery of the tire carcass in the contact patch. Hysteresis accounts for 85–90% of total rolling resistance; the rest comes from air turbulence inside the tire, road surface microdeformation, and bearing friction. For a passenger car tire, rolling resistance typically consumes 4–11% of total fuel energy.

How is rolling resistance calculated?

The standard formula is: F_roll = Crr × m × g × cos θ, where Crr is the rolling resistance coefficient (dimensionless), m is vehicle mass (kg), g is 9.81 m/s², and θ is the road incline angle. Power loss is P_roll = F_roll × v (v in m/s). At 90 km/h, a 1,500 kg car with Crr 0.012 loses roughly 177 N and 4.4 kW to rolling resistance alone.

What is a good rolling resistance coefficient (Crr)?

EV-optimized tires achieve Crr 0.006–0.008. Standard all-season tires: 0.010–0.015. SUV tires: 0.012–0.018. All-terrain tires: 0.025–0.045. Road bicycle tires reach as low as 0.002–0.004. Heavy truck long-haul radials target 0.005–0.007. Lower is always better for efficiency.

Does rolling resistance increase with speed?

Yes. The ISO 28580 standard documents a measurable speed-dependent Crr increase. A simplified linear model is: Crr(v) = Crr₀ × (1 + 0.0015 × v[km/h]). At 120 km/h, this means an 18% higher effective Crr compared to the low-speed rated value. Tire labels and manufacturer data always quote Crr at a standardised test speed — typically 80 km/h per ISO 28580.

How does road surface affect rolling resistance?

Smooth concrete can reduce rolling resistance by 15% compared to new asphalt. Worn asphalt adds roughly 10%; chip-seal and cobblestones add 25–50%. Loose gravel or sand can more than double the effective Crr because the tire sinks into the surface, deforming both the tire and the road material.

How much fuel does rolling resistance waste?

The U.S. Department of Energy estimates rolling resistance accounts for 4–11% of a passenger car's total fuel consumption. A 10% reduction in Crr translates to approximately 1–1.5% better fuel economy. For a heavy truck, tire rolling resistance can consume up to one-third of total fuel because aerodynamic drag at lower highway speeds is less dominant.

What is the difference between rolling resistance and aerodynamic drag?

Rolling resistance (F_roll = Crr × mg) is proportional to vehicle weight and nearly constant with speed. Aerodynamic drag (F_aero = ½ρCdAv²) is proportional to the square of speed and dominates at higher velocities. At 50 km/h, rolling resistance typically exceeds aero drag for a sedan. Above ~80–90 km/h, aerodynamic drag takes over and grows rapidly.

Does road grade affect rolling resistance?

Road grade adds a separate gravity component: F_grade = m × g × sin(arctan(grade%)). It also slightly reduces rolling resistance because the normal force on a slope is m × g × cos(θ) rather than the full m × g. On a 5% gradient, normal force drops by ~0.1%, which is negligible compared to grade force. At 10% grade with a 1,500 kg car, grade force is ~1,471 N vs. a rolling force of ~177 N.

How do EV tires reduce rolling resistance?

EV-optimized tires use silica-compound treads with low hysteresis loss, stiffer sidewalls to support higher battery weight, and reinforced carcasses. Crr values: 0.006–0.008 vs. 0.010–0.015 for standard tires. On a 100 kWh battery pack, switching from Crr 0.012 to Crr 0.007 can add 30–50 km of range, depending on speed and vehicle mass.

Can I reduce rolling resistance by inflating tires harder?

Yes, up to a practical limit. Higher inflation pressure reduces tire deformation, lowering Crr. However, over-inflation reduces the contact patch area, which decreases grip and worsens ride quality. Under-inflation by 10 PSI can increase rolling resistance by 10–20%. Always stay within the vehicle manufacturer's door-placard pressure range for on-road driving.

What does the power result mean in practical terms?

The rolling resistance power result represents the continuous power your engine or motor must supply just to overcome tire deformation — before climbing any hill or pushing through air. For an EV, this figure directly predicts battery drain. A 1,900 kg EV with Crr 0.007 at 110 km/h needs ~600 W purely for rolling resistance — about 5.5 Wh/km just from the tires.

Is this calculator suitable for bicycles and motorcycles?

Yes. Use the bicycle tire presets and enter total rider + bike mass. The physics are identical — F_roll = Crr × mg applies to all wheeled vehicles. For motorcycles, use Crr 0.010–0.015 and enter appropriate frontal area and Cd values. The ISO 28580 dynamic Crr correction is less critical at cycling speeds below 40 km/h.

Tire Rolling Resistance Calculator

Calculate rolling resistance force (N), power loss (W/kW), and fuel or EV efficiency impact from tire Crr, vehicle mass, speed, road surface, and grade. ISO 28580 dynamic Crr speed-correction model included.

Default Scenario — Reference Values

A standard passenger car tire has a Crr of 0.010–0.015, producing roughly 1.0–1.5% of the vehicle's weight as rolling resistance force. At 60 mph (97 km/h), a 1,500 kg car with a standard tire generates ~220 N — a low rolling resistance tire (Crr 0.007) cuts that to ~140 N, saving ~3–5% fuel or 30–50 km of EV range per 100 kWh.

Scenario	Answer
Typical passenger car Crr	0.010–0.015 · equals 1.0–1.5% of vehicle weight as rolling force
Low rolling resistance (LRR) tire	0.006–0.009 · saves ~3–5% fuel vs standard tire
10 PSI under-inflation	Rolling resistance +20% · fuel economy −2–3%
1,500 kg car at 60 mph on flat	Standard (Crr 0.012): ~220 N · LRR (Crr 0.007): ~140 N

Flat road, new asphalt surface. Dynamic Crr correction applied per ISO 28580. Aerodynamic drag excluded to isolate rolling resistance.

Input Units

Metric (SI)Imperial

Vehicle Mass (kg)

Vehicle Speed (km/h)

Road Grade: 0%

−15% DownhillFlat+15% Uphill

Tire Type / Crr Preset

All-season tire for typical sedans & hatchbacks. Most common preset.

Road Surface

Baseline reference surface.

Dynamic Crr (speed-dependent)

Include Aerodynamic Drag

Aerodynamic Parameters

Drag Coefficient (Cd)

Frontal Area (m²)

Air Density (kg/m³)

Results

Rolling Resistance

Crr base: 0.0120

200.4 N

Crr effective: 0.0136

Grade Resistance

0.0 N

Grade: 0% → 0.00°

Aerodynamic Drag

252.7 N

½ × 1.225 × 0.3 × 2.2 × v²

Total Resistance

453.1 N

Rolling 44.2%Grade 0.0%Aero 55.8%

Formula: F_total = C_rr × mg·cos θ + mg·sin θ + ½ρC_dAv²

AI Insight

Get a plain-English explanation of your results — what they mean for your vehicle and driving experience.

Rolling Resistance Formula Explained

F_total = F_roll + F_grade + F_aero

F_roll = Crr × m × g × cos(arctan(grade/100))

F_grade = m × g × sin(arctan(grade/100))

F_aero = ½ × ρ × Cd × A × v²

P_roll = F_roll × v [Watts, v in m/s]

Dynamic Crr = Crr₀ × (1 + 0.0015 × v[km/h]) — ISO 28580

Rolling resistance coefficient (Crr) is a dimensionless number measured under controlled conditions per ISO 28580 on a 1.7 m steel drum at 25°C. The coefficient is primarily determined by hysteresis — the incomplete recovery of tire rubber after deformation in the contact patch — which accounts for 85–90% of all rolling resistance losses.

Speed dependency (ISO 28580 correction). Every 10 km/h of additional speed adds roughly 1.5% to the effective Crr. At 120 km/h, the dynamic Crr is ~18% higher than the rated low-speed value. This calculator applies that correction when the toggle is enabled.

Aerodynamic drag vs. rolling resistance crossover. At ~80–90 km/h for a typical sedan (Cd 0.30, A 2.2 m²), the forces are approximately equal. Above 100 km/h, aerodynamic drag grows as v² and quickly dominates — this is why highway fuel economy is far more sensitive to Cd than urban driving, where tire Crr matters more.

Rolling Resistance Reference Values

Pre-calculated rolling resistance force and power loss for common vehicle classes at typical operating conditions. Flat road, new asphalt. Dynamic Crr correction applied.

Vehicle Type	Mass	Speed	Crr	Roll Force	Power Loss
Compact Car (Civic, Corolla)	1,200 kg	90 km/h	0.012	141 N	3.5 kW
Mid-Size Sedan (Camry, Accord)	1,500 kg	90 km/h	0.012	177 N	4.4 kW
SUV / Crossover (RAV4, CR-V)	1,900 kg	100 km/h	0.014	261 N	7.3 kW
EV Sedan (Tesla Model 3)	1,850 kg	120 km/h	0.007	127 N	4.2 kW
Full-Size Truck (F-150, Silverado)	2,500 kg	100 km/h	0.015	368 N	10.2 kW
Long-Haul Truck (18-wheeler)	25,000 kg	90 km/h	0.006	1,472 N	36.8 kW
Road Cyclist (rider + bike)	80 kg	35 km/h	0.004	3.1 N	30 W
MTB / Gravel Rider	90 kg	20 km/h	0.012	10.6 N	59 W

Power values are rolling-resistance power only (P = F_roll × v). Total drivetrain power at highway speed is significantly higher once aerodynamic drag is included.

7 Factors That Affect Tire Rolling Resistance

1. Tire Construction & Compound

Silica-compound treads and supple radial carcasses minimize hysteresis energy loss. Stiffer sidewalls (EV tires) reduce deformation under high battery weight. Tread pattern depth and block geometry also affect internal friction.

2. Inflation Pressure

Higher pressure reduces carcass deformation, directly lowering Crr on hard surfaces. Under-inflation by 10 PSI can increase rolling resistance by 10–20%. On soft ground (gravel, sand), lower pressure helps the tire conform to the surface and reduces resistance.

3. Vehicle Mass & Load

Rolling resistance force scales linearly with mass (F_roll = Crr × mg). Adding 200 kg cargo to a 1,500 kg car increases rolling resistance by ~13%. EV battery packs (400–600 kg) significantly increase the importance of low-Crr tire selection.

4. Vehicle Speed

The ISO 28580 speed correction adds ~1.5% to Crr per 10 km/h. At 120 km/h, effective Crr is 18% higher than at 0 km/h. This effect is caused by heat buildup and altered contact patch geometry at higher rotational speeds.

5. Road Surface Texture

Macro-texture (chip seal, cobblestones) forces the tire to deform into surface irregularities, increasing effective Crr by 25–150% over smooth concrete. Micro-texture primarily affects wet grip rather than rolling resistance.

6. Tire Temperature

Cold tires (< 20°C) have significantly higher Crr — up to 20–30% higher at 0°C. This is why ISO 28580 measurements are corrected to 25°C. Winter driving produces genuinely higher rolling resistance beyond just compound differences.

7. Tire Diameter & Width

Larger diameter tires have a shallower curvature in the contact patch, reducing deformation angle and lowering Crr. Wider tires spread load over a larger area, changing the patch shape but not necessarily reducing total resistance — the Crr of the compound matters more than width alone.

How to Use This Calculator

1
Select a scenario or enter custom inputs
Click one of the quick scenario presets (Highway Sedan, EV, Heavy Truck, Road Cyclist, Off-Road SUV) to auto-fill all fields, or enter your own vehicle mass and speed manually.
2
Choose a tire type and Crr preset
Select from 8 tire category presets — from EV-optimized to all-terrain — or choose 'Custom Crr' to enter a specific coefficient from manufacturer data or test reports.
3
Select the road surface
Pick the surface type your vehicle will travel on. The calculator applies a surface multiplier to the base Crr — smooth concrete reduces it by 15%; loose gravel can double it.
4
Set road grade
Use the slider to input road incline from −15% (downhill) to +15% (uphill). Grade force is calculated separately from rolling resistance for accuracy.
5
Enable aerodynamic drag (optional)
Toggle aerodynamic drag on and expand the aero panel to enter drag coefficient (Cd), frontal area (m²), and air density for altitude correction.
6
Enable dynamic Crr for highway speeds
Toggle the ISO 28580 speed-dependent Crr correction for speeds above 60 km/h. This accounts for the real-world increase in rolling resistance at higher rotational speeds.
7
Read results across three tabs
Switch between Forces (N or lbf), Power (W, kW, or hp), and Efficiency (Wh/km, kWh/100km, EV range, and ±10% Crr sensitivity analysis).

Frequently Asked Questions

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