Calculateur de Puissance en Montée
Calculez la puissance nécessaire pour grimper une côte à vélo.
Total Power Required
232 W
Total Power Required vs Gradient
Formule
## How Hill Climb Power Is Calculated Climbing requires overcoming gravity plus rolling resistance and aerodynamic drag. ### Formula **P_total = P_gravity + P_rolling + P_aero** - **P_gravity = mass x g x gradient x speed** - **P_rolling = Crr x mass x g x speed** - **P_aero = 0.5 x rho x CdA x speed^3** On steep climbs (over 5%), gravity dominates and accounts for 80-90% of the power requirement. ### VAM VAM (velocita ascensionale media) measures vertical meters gained per hour. Top climbers achieve 1500-1800 m/hr on major climbs.
Exemple Résolu
Climbing a 7% gradient at 8 mph, 185 lbs total weight.
- 01Mass = 185 * 0.4536 = 83.9 kg
- 02Speed = 8 * 0.447 = 3.58 m/s
- 03P_gravity = 83.9 * 9.81 * 0.07 * 3.58 = 206 W
- 04P_rolling = 0.005 * 83.9 * 9.81 * 3.58 = 14.7 W
- 05P_aero = 0.5 * 1.225 * 0.4 * 3.58^3 = 11.2 W
- 06Total = 206 + 15 + 11 = 232 W (2.76 W/kg)
- 07VAM = 3.58 * 0.07 * 3600 = 902 m/hr
Questions Fréquentes
Why does weight matter so much for climbing?
On a 7% gradient, gravity accounts for about 85-90% of total resistance. Losing 1 kg saves roughly 2-3 watts at typical climbing speeds.
What W/kg do I need to be a good climber?
Recreational: 2-3 W/kg, competitive amateur: 3.5-4.5 W/kg, professional: 5.5-6.5 W/kg sustained on long climbs.
What is a good VAM?
Recreational riders: 600-900 m/hr. Strong amateurs: 900-1200 m/hr. Professionals: 1500-1800 m/hr on major climbs.
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