체중, 자전거 무게, 경사도, 노면 유형, 바람을 고려해 파워(와트)로 사이클링 속도를 추정하세요. 실제 구름 저항과 CdA 프리셋을 반영한 물리 기반 계산입니다.
| 힘 구성요소 | 와트 | 전체 대비 % |
|---|
총 파워 = 구름저항 + 공기저항 + 중력 + 구동계 손실입니다. 구체적으로: P = Crr·m·g·v + ½·ρ·CdA·(v + 풍속)²·v + m·g·sin(atan(경사도))·v를 구동계 효율 0.95로 나눈 값입니다.
상수: 공기 밀도 ρ = 1.225kg/m³, g = 9.8067m/s². 속도는 이분 탐색으로 계산됩니다.
The tool inverts the standard cycling power equation. Power at the pedals is (Crr·m·g·v + ½·ρ·CdA·(v+wind)²·v + m·g·sin(atan(grade/100))·v) ÷ 0.95, with air density ρ = 1.225 kg/m³, gravity g = 9.8067 m/s² and a 0.95 drivetrain efficiency. That cannot be rearranged for v algebraically, so it runs sixty rounds of binary search between −20 and 30 m/s to find the speed your wattage actually produces.
Surface / bike sets the aerodynamic and rolling constants together: Road bike CdA 0.32 and Crr 0.005, TT bike 0.24 / 0.004, Gravel 0.36 / 0.012, MTB 0.42 / 0.020, Commuter 0.45 / 0.008. On the flat CdA dominates — at the default 75 kg rider, 8 kg bike and 200 W the breakdown shows aerodynamic drag taking about 80% of your power. Tilt the Gradient field to 5% and gravity takes 85% instead.
Fixed CdA presets are the weak point. Your real frontal area swings enormously between hoods, drops and a tuck, and 0.32 describes a moderately aggressive road position rather than any specific rider, with no field to enter a measured value. Air density is pinned at sea level, so mountain speeds read low. Wind is a pure head- or tailwind with no crosswind or yaw angle, and drafting is not modelled at all.
About 33 km/h for a 75 kg rider on an 8 kg road bike in still air, which is the default setup. Aerodynamic drag takes roughly 80% of that power, so the same wattage on the TT bike preset buys nearly 37 km/h.
Because gravity scales with total mass and speed. At 83 kg combined the climbing term absorbs about 85% of 200 W, dropping speed to roughly 14 km/h — under half the flat figure — while aerodynamic drag falls below 7% of the total.
The Road bike option uses a single CdA of 0.32, roughly a moderately aggressive hoods position. Real riders span about 0.28 in the drops to 0.40 sitting upright, and there is no custom field, so pick whichever surface preset is closest to your posture.
No. The model treats you as riding alone in still or steady air. Sitting in a bunch can cut aerodynamic drag by 30% or more, so real group speeds at a given wattage will always run higher than this estimate suggests.
On the flat, almost none — mass only enters through rolling resistance, a small share of total power. On a climb it is close to proportional, because the gravity term is multiplied directly by rider weight plus bike weight combined.
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