Power-to-weight ratio (W/kg) is sustained power divided by bodyweight. It matters most when climbing or accelerating, because gravity acts on total mass: two riders with equal power but different weights climb very differently. It is usually quoted at threshold (around FTP). Pros sustain over 5 W/kg; a strong amateur is 3-4 W/kg. You improve it by raising power, lowering weight, or both.
Key points
- Watts ÷ bodyweight (W/kg)
- Decisive for climbing
- Quoted near threshold (FTP)
- Pros 5+ W/kg, amateurs 3-4
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