Should I focus on FTP or watts per kilo?
Both FTP and watts per kilo (W/kg) are useful, but they don’t win the same events. Your focus should match the demands of your target course and how the race is likely to unfold. Here’s how to decide—and what to train.
Quick definitions
- FTP: The highest power you can sustain for around an hour. It’s your aerobic engine and underpins most race efforts.
- W/kg: FTP divided by body mass. It’s your climbing power relative to your weight.
Rule of thumb: the steeper and longer the climb, the more W/kg matters. The flatter and faster the course, the more absolute FTP (and aerodynamics) matter.
When watts per kilo decides the result
W/kg rises in importance as gradient and climb duration increase. Gravity punishes extra mass, and drafting helps less at low speeds uphill.
- Long climbs: Sustained ascents over 10–15 minutes and >5–6% grade. Think mountain fondos, alpine road races, summit finishes, hilly stage races.
- Hilly breakaways: Solo or small-group moves on rolling terrain where every rise is ridden hard.
- Indoor climbing races: Hill-focused virtual events, where pack speeds are lower and gravity dominates.
What this means for training:
- Lift FTP with threshold and tempo volume so more of your climbing is below red line.
- Protect power while managing body mass if appropriate. Aim for a slow loss (about 0.25–0.5% body weight per week), prioritize protein (1.6–2.2 g/kg/day), and fuel key sessions.
- Climb-specific work: 2×20–3×16 min at 95–100% FTP, and 4–6×5 min at 105–110% on 6–10% gradients. Include low-cadence (60–75 rpm) blocks for strength endurance.
W/kg = FTP ÷ body mass
Example: 300 W at 75 kg = 4.0 W/kg; at 65 kg = 4.6 W/kgWhen absolute FTP (and aerodynamics) matter more
On flats and fast rolling courses, speed is driven by power against aerodynamic drag. Here, absolute power and low CdA (your aero drag) outperform a high W/kg at the same watts.
- Time trials and flat triathlons: High FTP paired with an aero position wins. W/kg is secondary.
- Crits and flat road races: Repeatable surges, sprint power, and drafting skills. FTP supports recovery between efforts; W/kg matters little unless there’s a meaningful hill.
- Track endurance events: Pursuit, team pursuit, points races—absolute power and aerodynamics rule.
- Windy coastal routes and echelons: Holding position in crosswinds is about watts and efficiency.
What this means for training:
- Raise FTP through a mix of sweet spot (88–94% FTP), threshold (95–100%), and long endurance. Example week: 1 threshold session (e.g., 3×12–15 min), 1 VO2 session (e.g., 5×3–4 min @ 110–120%), plus 1 long ride.
- Build repeatability for crits: 30/30s, 40/20s, and 8–12 sprint efforts (10–15 s) with full recovery.
- Aero matters: A comfortable, sustainable position can be worth more speed than a small change in W/kg.
How to choose your focus and train for your event
Match the metric to the course and your role in the race.
| Event type | Terrain/speed | Priority metric | Why |
|---|---|---|---|
| Mountain gran fondo, summit finishes | Long, steep climbs | W/kg first, FTP always | Gravity dominates; drafting limited |
| Flat/rolling TT | High speed, steady | FTP first, aero | Power vs air resistance; W/kg less relevant |
| Crit | Flat, technical | FTP for recovery; sprint/anaerobic | Short surges and positioning decide |
| Road races (mixed) | Rolling, variable | Context-dependent | W/kg for hills; FTP/aero for flats |
| Gravel (varied) | Mixed surfaces | FTP, fatigue resistance; W/kg for big climbs | Long duration and terrain changes |
| Cyclocross | Punchy, technical | VO2/anaerobic; skills | Short bursts and handling, not W/kg |
A simple decision guide:
- Map the demands: How many minutes above 5–6%? Are key moves on climbs or flats? Typical speeds?
- Pick the primary limiter: If you get dropped on long climbs at steady power, target W/kg. If you struggle to hold wheels in crosswinds or TT pace, target FTP and aerodynamics.
- Set a 8–12 week plan: Choose two key sessions per week that move the primary metric, and keep one session for the secondary needs.
Practical programming examples:
- Climb-focused block (W/kg): 1 threshold session (2–3×16–20 min @ 95–100%), 1 VO2 session (5–6×4–5 min @ 110–120%), long Z2 ride with 30–45 min tempo climbs. Strength 1–2×/week. Maintain energy balance with a small weekly deficit if appropriate; fuel every hard session.
- Flat TT block (FTP/aero): 1 threshold-over/under (e.g., 3×12 min alternating 95/105%), 1 long sweet spot (1×40–60 min @ 88–92%), plus a long endurance ride. Include position practice and pacing at target power.
- Crit block (repeatability): 1 VO2/anaerobic session (e.g., 3 sets of 8×30/30 @ 120%/easy), 1 sprint technique session (8–12 sprints, full recovery), and 1 tempo/SS ride for aerobic support. Cornering and pack drills.
Weight management guardrails (if you choose a W/kg focus):
- Lose slowly: ~0.25–0.5% body weight per week; avoid aggressive cuts during heavy intensity blocks.
- Fuel workouts: carbs before/during hard sessions (30–60 g/h), recovery protein 20–30 g.
- Preserve muscle: 1.6–2.2 g/kg/day protein and 1–2 strength sessions weekly.
- Monitor trends: morning weigh-ins 3–4×/week; prioritize sleep and hydration. If power drops for 2+ weeks, reduce deficit.
Two closing truths:
- You almost never regret a higher FTP. It helps in every event.
- W/kg is the tie-breaker on real climbs. Use it when your goals are uphill.
Choose the metric that matches your course, train it deliberately, and keep the other within sight. That balance turns good numbers into faster rides.
