Pacing strategies for time trials and long climbs

The fastest riders rarely ride the highest peak watts; they ride the right watts at the right time. By using your power-duration curve, critical power (CP), and W’ (your finite work capacity above CP), you can pace time trials and long climbs without blowing up mid-effort.

Know your numbers: FTP, CP, W’ and your power curve

Before you decide how to pace, you need solid anchors:

• FTP (functional threshold power): A practical estimate of the highest power you can sustain for ~40–60 minutes. Many plans and devices use FTP to set zones.
• CP (critical power): A model-based analog to your sustainable steady-state power. Above CP you draw down W’; below CP you can recover W’ gradually.
• W’ (W-prime, often called FRC): Your fixed work capacity above CP, measured in kilojoules. Spend it on surges; protect it from early depletion.
• Power-duration curve: Your best powers over many durations (1 s to several hours). This shows what you can likely hold for a given race duration.

How to get them

• Use recent maximal efforts to build a power-duration curve. If needed, schedule a fresh 3–5 min and 12–20 min best effort week to update the curve.
• CP and W’ can be estimated from multiple maximal efforts (3–20 min). Many head units and training platforms calculate CP/W’ and display W’ balance.
• If you only have FTP: for practical pacing, treat CP as roughly 95–100% of FTP, recognizing individual variance.

Rule of thumb: above CP you are spending from W’; below CP you are paying it back. Spend it where it turns into speed, not where it becomes heat and lactate.

Turn your power curve into a pacing target

Use your curve and event duration to set a realistic target, then layer W’ management on top.

1. Pick the expected duration. Estimate your TT time or climb time from distance, gradient, and past results.
2. Set a base target power. Use your best power for that duration from the curve. If conditions are hard (heat, altitude, technical), start 2–5% lower.
3. Apply W’ budgeting. Decide how much W’ you are willing to spend in the first third (very little), middle (some, where it buys speed), and final third (most of what remains).
4. Adjust for environment. As a starting point, reduce target power by ~2–3% near 1000 m altitude and ~5–7% near 2000 m. In hot conditions, aim 1–3% lower and increase cooling and fluids.

Pacing a time trial with W’ and power-duration data

Start: controlled, not conservative

• First 2–3 min: ride at ~97–99% of target power to avoid a W’ dump while HR and oxygen kinetics catch up.
• Avoid big spikes out of the start ramp or corners; cap surges at ~105–110% of target unless passing or cresting a short rise.

Middle: spend W’ where it becomes speed

• Headwind/uphills: 102–105% of target. Small controlled overs to translate power into speed.
• Tailwind/downhills: 95–98% of target. Save W’ because extra watts create less speed here.
• Rolling terrain: Keep power changes smooth; use gears and cadence to avoid >15–20 W swings.
• W’ balance: If your head unit shows W’bal, avoid letting it fall below ~30–40% before halfway. If you don’t have W’bal, use RPE: if breathing and legs feel anaerobically ‘hot,’ you’re likely spending W’ too fast.

Final third: commit

• With 8–10 min to go, let power drift up 1–3% if you’re stable.
• With 3–5 min to go, spend most of remaining W’: brief rises to 105–110% of target if you can still return to target within 20–30 s.

Course execution details

• Corners/U-turns: Roll in a gear that lets you re-accelerate to target without a 500–700 W spike. Think ‘smooth fast’ not ‘snap’.
• Crests: Carry pressure 5–10 s over the top, then relax slightly on the faster downhill.
• Cadence: Use your preferred TT cadence (often 85–95 rpm). Sudden low-cadence grinds are costly to W’.

Worked example (20 km flat TT, ~30 min)

Simple W’ math you can use

time_to_empty_seconds = W_prime_joules / (power - CP)

Example: CP = 290 W, W' = 18,000 J
At 330 W (40 W above CP), time_to_empty = 18,000 / 40 = 450 s (7:30)
At 310 W (20 W above CP), time_to_empty = 18,000 / 20 = 900 s (15:00)

Recovery below CP is slower and depends on how far below CP you ride. Plan on partial recovery, not a full refill, during a typical TT.

Pacing long climbs: steady power, smart surges

Match pacing to climb duration

• 5–10 min climbs: Target 105–112% of FTP if trained for VO2max work. Expect to spend a large portion of W’. Keep the start controlled for ~60–90 s.
• 20–40 min climbs: Target 95–100% of FTP (near CP). Aim for a slight negative split: start at the low end, finish at the high end.
• 60+ min climbs: Target 88–95% of FTP depending on fitness, heat, and altitude. Prioritize fueling, cooling, and cadence consistency.

Use W’ where it makes sense on irregular climbs

• Steep ramps (10–20%): Allow power to rise modestly above CP, but budget W’. Keep cadence viable; stand briefly if needed to avoid grinding.
• Shallow sections/plateaus: Drop to just below CP to recover W’. Resist the urge to surge simply because the gradient eases.
• Hairpins: Enter in a gear that lets you keep pressure without a big acceleration spike exiting the turn.

Worked example (25 min alpine climb)

Rider: CP 290 W, W’ 18 kJ, best 25 min power 300 W. Target 295–300 W overall.

• Start 0–5 min: 285–290 W, keep W’ mostly intact.
• Middle 5–20 min: ride 295–300 W. On 30–60 s ramps, allow 315–325 W, knowing that at 310 W (20 W over CP) you could hold ~15 min before emptying W’, so brief ramps are affordable. After ramps, ride 280–285 W for 30–60 s to begin W’ recovery.
• Final 5 min: 300–305 W if stable; spend most remaining W’ on the last steep pitch.

Environment and fatigue adjustments

• Heat: Lower targets 1–3%, drink early, and prioritize dousing and airflow.
• Altitude: Reduce targets ~2–3% around 1000 m, ~5–7% around 2000 m. Keep breathing rhythm steady and avoid early surges.
• Fueling: For efforts 40+ min, aim 60–90 g carbs/hour; for 20–40 min, a carb rinse or small gel 10–15 min pre-climb can help.

Practice sessions to harden your pacing

• TT pacing rehearsal: 3×10 min at 95–100% FTP with 5 min easy between. Within each 10 min, ride 3 min at 97%, 5 min at 100–102%, 2 min at 102–105%.
• Over-under for W’ control: 4–6×8 min alternating 1 min at 105–110% FTP, 1 min at 90–95% FTP. 4–5 min easy between sets. Focus on smooth transitions.
• Climb-specific tempo-threshold: 1×30–40 min at 90–95% FTP on a steady climb. If the road undulates, cap overs at +10–20 W and compensate with brief -10–20 W dips.

Common pacing mistakes and quick fixes

• Starting too hard: Cap the first 2–3 min to 97–99% of target and use cadence discipline.
• Big power swings: Use smaller gears and anticipate terrain to keep power changes within ±10–15 W when possible.
• Early W’ depletion: Save big overs for the final third; treat the first third as ‘set-up’ not ‘attack.’
• Ignoring conditions: Adjust targets for heat/altitude and choose cooling strategies; don’t chase sea-level numbers at 2000 m.

Race-day checklist

• Clear target power from your power-duration curve for the expected duration.
• Plan where to spend and save W’ based on wind, gradient, and corners.
• Warm-up: 15–25 min with 2–3 small openers to prime oxygen kinetics.
• Data fields: 3 s power, lap power, HR, cadence; add W’bal if available.
• Fuel and fluids appropriate to effort length and conditions.

Use your numbers to guide, your sensations to confirm, and your W’ as a precious resource. That combination is how you finish with speed, not survival mode.