Rolling Resistance Calculator

Calculate power lost to rolling resistance and see how tire choice, tube system, and surface affect your speed.

Inputs

Rolling Resistance

Calculate to see rolling resistance power and comparison to aero drag.

Interpretation

  • Rolling resistance matters more at lower speeds; aerodynamic drag dominates at higher speeds.
  • The crossover point is roughly 25-30 km/h for road bikes — below that, tires matter more than aero.
  • Tubeless and latex setups provide measurable savings (0.5-2W) compared to standard butyl at typical speeds.

What to Do Next

  • Use the Tire Pressure Calculator to optimize pressure for your chosen tires.
  • Use the CdA Calculator to compare aerodynamic drag alongside rolling resistance.
  • Consider total cost of ownership: a faster tire that punctures often may not be worth the savings.

Methodology

Version v1.0
Updated 2026-06-20
Owner Cycling Regimen Editorial

  • Physics model

    F_rr = Crr × mass × g × cos(θ), P_rr = F_rr × velocity.

  • Crr values

    Based on published testing data from independent labs and manufacturer specifications.

  • Aero comparison

    Shows rolling vs aerodynamic breakdown to help prioritize upgrades.

About Our Calculation Approach

Frequently Asked Questions

How much faster are low rolling resistance tires?

Switching from a training tire (Crr 0.0045) to a race tire (Crr 0.003) saves approximately 5-8 watts at 30 km/h for a 80 kg system. Over 40 km, that is roughly 20-40 seconds.

Is rolling resistance more important than aerodynamics?

It depends on speed. Below ~25 km/h, rolling resistance is the larger factor. Above 30 km/h, aerodynamic drag dominates (it grows with the cube of speed). For most road cyclists at typical speeds, aero is more impactful.

Does tubeless really save watts?

Yes. Eliminating the tube removes friction between tube and tire casing, typically saving 0.3-1.0W per tire at road speeds. The benefit is measurable but modest compared to tire compound quality.

Disclaimer: This calculator provides estimates based on published exercise science models. Results are not medical advice. Individual physiology, health status, and environmental conditions affect real-world outcomes. Consult a qualified healthcare provider or certified coach before making training decisions based on these outputs.