How Much Energy Does Drafting Save on a Bicycle?
Drafting 0.1–0.5m behind another cyclist saves about 27–50% of your aerodynamic power. Buried mid-pack in a large group, drag can drop to just 5–10% of riding solo — at cruising speeds that's tens to over a hundred watts of free energy. The savings decay fast with distance; here's the full curve.
The numbers from research
- Closely behind a single rider (0.1–0.5m wheel gap): about 27–50% aero power savings — consistent from the classic wind-tunnel and field studies (Kyle, 1979) to modern CFD.
- Mid-pack in a large group: Blocken et al.’s 2018 CFD study of a 121-rider peloton found riders buried in the belly of the bunch experience as little as 5–10% of solo drag.
- The leader gains a little too: the follower fills in the leader’s low-pressure wake, cutting the front rider’s drag by ~2–3%.
Distance decay: every half wheel leaks watts
Benefits fall off quickly with gap: 0.1–0.3m is maximal; at one bike length (~2m) savings often drop to ~20%; beyond 3–4 bike lengths there is little left. In crosswinds the wake shifts sideways — which is why echelons form diagonally.
Drag the gap slider and watch the savings decay
Open draft mode in our free browser wind tunnel: drag the spacing slider and watch the rear rider’s drag percentage and watts saved change in real time, with the low-pressure wake drawn for you.
Open VeloTunnel draft mode ›Safety rules
- Never overlap the wheel in front — the number-one cause of group crashes.
- Look through the rider ahead, over their shoulder at the road, not at their wheel.
- Feather the brakes: speed control in the draft is anticipation plus light touches, never grabs.
- Rotate: in a group of 2–4, pull for 30s–2min each; a rotating paceline cruises 3–5 km/h faster than any solo rider.
Want to sit lower and steadier in the draft? Make sure your setup allows it — see aerodynamics & CdA explained.
A stable draft position starts with a correct fit
Upload a side-view riding video — AI measures your knee/hip/torso angles and tells you how much lower you can sustainably go.
Upload a video, start the analysis ›FAQ
How much power does drafting save?
Studies show riding 0.1–0.5m behind another cyclist saves roughly 27–50% of aerodynamic power; buried mid-pack in a big group, drag can fall to 5–10% of riding solo — tens to over a hundred watts at cruising speeds.
How close do I need to follow for real benefit?
Closer is better: 0.1–0.3m gives the maximum benefit, savings drop to around 20% at one bike length (~2m), and little remains beyond 3–4 bike lengths. Beginners should start around 0.5m and close the gap as skills improve.
Does the lead rider work harder because of a drafter?
No — slightly the opposite. The follower fills the leader’s low-pressure wake, reducing the front rider’s drag by about 2–3%. Pulling is still by far the hardest position, which is why groups rotate.
Related guides
- Cycling aerodynamics & CdA explained — where the other 70% of your power actually goes
- What wind tunnel testing costs — and the free browser alternative
- TT & aero torso angle — how low can you sustainably go