Definition
Xert Relative Power (XRP) estimates how much power a typical 75 kg rider would need to produce to match the performance of another rider at the same moment, all else being equal (same conditions, equipment, aerodynamics, etc.).
In other words: XRP “weight-normalizes” power so you can compare efforts between riders (or between your own rides at different weights) more fairly.
How it’s Calculated
Xert calculates Relative Power as:
Relative Power = Power × (75 / mass) ^ KGE- Power = the rider’s actual power (watts)
- mass = rider weight (kg)
- KGE (Kilogram Exponent) = a value that changes with gradient; steeper climbs use a higher KGE
Example (from Xert): a 65 kg rider doing 300 W at KGE 0.7 → XRP ≈ 332 W.
What it Means
Relative Power helps you understand performance when weight matters—especially on climbs—by translating a rider’s effort into an equivalent 75 kg effort.
Also note: improving “relative performance” isn’t only about weight — things like aero, rolling resistance, bike weight, and position can matter too!
Where You’ll See It
- Xert analysis views where relative/normalized performance is helpful (group ride analysis)
- In Strava training summary text
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