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.

Recreational riders: 600-900 m/hr. Strong amateurs: 900-1200 m/hr. Professionals: 1500-1800 m/hr on major climbs.

Estimate the power required to climb a hill on a bicycle given gradient, speed, and rider weight.

Gradient

Climbing Speed

mph

Rider + Bike Weight

lbs

Total Power Required

232 W

Power-to-Weight2.76 W/kg

Gravity Component89%

VAM (vertical m/hr)901 m/hr

Total Power Required vs Gradient

Climbing requires overcoming gravity plus rolling resistance and aerodynamic drag.

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 (velocita ascensionale media) measures vertical meters gained per hour. Top climbers achieve 1500-1800 m/hr on major climbs.

Climbing a 7% gradient at 8 mph, 185 lbs total weight.

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