Rolling Resistance Calculator

Enter your combined bike and rider weight, riding speed, and tire Crr coefficient to calculate rolling resistance force, power loss, and efficiency metrics.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Total Weight (Bike + Rider)
Input the combined weight of the rider and bicycle in kilograms.
2
Specify Speed
Provide your riding speed in kilometers per hour (km/h) to calculate the power lost to rolling resistance.
3
Add Rolling Resistance Coefficient (Crr)
Enter the dimensionless Crr value for your tires. Lower values (e.g., 0.003) indicate faster tires, while higher values (e.g., 0.015) indicate slower tires.
4
Select Tire Type Preset
Choose a tire type from the available presets (e.g., road, gravel, MTB) to automatically populate a typical Crr value.
5
Review Your Results
The calculator will display the rolling resistance power in watts, resistance force in newtons, and calories burned per hour due to rolling resistance.

Example Calculation

A cyclist wanting to understand the power lost to rolling resistance on their road bike.

Total Weight (Bike + Rider) (kg)

Speed (km/h)

Rolling Resistance Coefficient (Crr)

0.005

Tire Type Preset

road

Results

42.0 W

Tips

Lower Crr for Speed

To significantly reduce rolling resistance and improve speed, invest in high-quality road tires with a Crr below 0.004, especially for competitive cycling or long distances.

Maintain Optimal Tire Pressure

Always inflate tires to the manufacturer's recommended pressure range. Under-inflated tires dramatically increase Crr, leading to more power loss and a higher risk of pinch flats.

Consider Road Surface

Crr values are highly dependent on the riding surface. A Crr of 0.005 on smooth asphalt could increase to 0.010 or more on rough chip-seal or gravel, requiring more power to maintain speed.

Optimizing Cycling Performance: Rolling Resistance Calculator

The Rolling Resistance Calculator is an invaluable tool for cyclists, engineers, and fitness enthusiasts looking to quantify the energy lost to rolling friction. By inputting total weight, speed, and the Rolling Resistance Coefficient (Crr), users can accurately determine the power (in watts) expended to overcome tire drag. This insight is critical for optimizing tire choice, pressure, and training strategies. For instance, a cyclist and bike weighing 85 kg moving at 30 km/h with a Crr of 0.005 will lose approximately 42 watts to rolling resistance, a significant portion of their total power output in 2025.

The Impact of Rolling Resistance on Cycling Efficiency

Rolling resistance is one of the primary forces a cyclist must overcome, alongside aerodynamic drag and gravity. Understanding its magnitude allows riders to make informed choices that directly impact their speed, endurance, and overall efficiency. Reducing rolling resistance means more of a cyclist's power output is translated into forward motion, leading to faster times for the same effort or less effort required to maintain a given speed. This is particularly crucial in competitive events or long-distance rides where every watt saved contributes to performance gains.

Calculating Rolling Resistance Force and Power

Rolling resistance is fundamentally a force that opposes motion. The power lost to rolling resistance is then derived from this force and the speed of travel. The key input is the Rolling Resistance Coefficient (Crr), which accounts for tire deformation and surface interaction.

Rolling Resistance Force (N) = Total Weight (kg) × Gravity (9.81 m/s²) × Crr
Rolling Resistance Power (W) = Rolling Resistance Force (N) × Speed (m/s)

Here, Total Weight is the combined mass of the bike and rider, Gravity is the acceleration due to gravity (approximately 9.81 m/s²), Crr is the dimensionless rolling resistance coefficient, and Speed is in meters per second (converted from km/h).

💡 Understanding power dynamics, like those in rolling resistance, is critical in electrical engineering, where Ohm's Law defines the relationship between voltage, current, and resistance.

Quantifying Rolling Drag for an 85kg Cyclist

Let's calculate the rolling resistance power for a cyclist weighing 70 kg on a 15 kg bike (total 85 kg), riding at 30 km/h with a Crr of 0.005.

Convert Speed to m/s: Speed (m/s) = 30 km/h × (1000 m/km) × (1 h/3600 s) ≈ 8.33 m/s
Calculate Rolling Resistance Force: Force (N) = 85 kg × 9.81 m/s² × 0.005 ≈ 4.17 N
Calculate Rolling Resistance Power: Power (W) = 4.17 N × 8.33 m/s ≈ 34.7 W

For this cyclist, approximately 34.7 watts are lost to rolling resistance. This highlights the impact of tire choice and pressure on overall cycling efficiency.

💡 To further optimize system performance, engineers often analyze how different factors contribute to energy loss, similar to how Op-Amp integrators manage signal over time.

Regulatory and Standards Context for Rolling Resistance

While there isn't a single universal regulatory body for bicycle tire rolling resistance, several organizations and standards play a role in its measurement and reporting. The ISO 28580 standard provides a methodology for measuring rolling resistance on passenger car and light truck tires, which, while not directly applicable to bicycles, establishes a common framework for testing. In competitive cycling, organizations like the UCI (Union Cycliste Internationale) do not directly regulate Crr but impose rules on equipment that indirectly influence tire design and, thus, rolling resistance. Bicycle component manufacturers, often adhering to ETRTO (European Tyre and Rim Technical Organisation) standards for tire dimensions and pressures, conduct their own extensive testing. These manufacturers frequently publish Crr data, usually measured using specialized laboratory drum tests, to help consumers select tires that meet performance expectations, such as achieving a Crr below 0.004 for professional road racing in 2025.

Frequently Asked Questions

What is rolling resistance in cycling?

Rolling resistance in cycling is the force that opposes the motion of a bicycle tire across a surface, primarily caused by the deformation of the tire and the road. It's a significant factor in how much power a cyclist needs to exert, with lower rolling resistance leading to greater efficiency and higher speeds for the same effort.

What is a good Crr (Rolling Resistance Coefficient) for bike tires?

A good Crr for bike tires typically ranges from 0.003 to 0.005 for high-performance road tires on smooth asphalt. For gravel tires, a Crr of 0.006 to 0.010 is common, while mountain bike tires can have Crr values exceeding 0.015 due to their wider profile and knobby tread for grip.

How does tire pressure affect rolling resistance?

Tire pressure has a substantial impact on rolling resistance; generally, higher pressure within the recommended range reduces Crr by minimizing tire deformation and hysteresis losses. However, excessively high pressure can lead to a harsher ride and reduced grip, while under-inflation significantly increases rolling resistance and puncture risk.

Does rider weight influence rolling resistance?

Yes, rider weight directly influences rolling resistance. A heavier rider or bicycle will experience greater tire deformation, leading to a higher rolling resistance force. While the Crr remains constant for a given tire and surface, the absolute power required to overcome rolling resistance increases proportionally with the total weight.