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IRONMAN

IRONMAN Portugal-Cascais

Saturday, 17 October 2026

IRONMAN Portugal–Cascais is a rolling 179.9 km bike paired with a 42.2 km run, where a steady W wind (around 6.3 m/s) and mild-to-warm air (16.2–20.5°C) shape pacing and fueling.

Air
16–21°
typical
Wind
6.3 W
prevailing
Water
typical — confirm
Bike climb
+1160 m
Fueling — per hour
90 g
carbs
750 mg
sodium
650 ml
fluid
Baseline for a ~12 h finish, 70 kg athlete, moderate conditions.

Typical 10-year conditions, not a forecast. Water temperature and the wetsuit ruling are set on race morning — check the IRONMAN race guide →

Worlds qualification — slots TBAsee who qualified →
0 km90 km180 km191 m
179.9 km · +1160 m climbing
T1 — swim to bike

Own the swim-to-bike handoff: after the swim, move quickly but not wildly, get socks/kit on efficiently, and commit to a mounting rhythm that doesn’t jolt your system. As you transition out of T1, take the first kilometers to find your cadence, settle your breathing, and confirm your drink-bottle access. Given the rolling profile and the W wind (6.3 m/s), be ready to keep power/effort slightly conservative early—use the first part of the bike to “set your race,” not to prove you can go hard immediately.

During the bike

The bike covers 179.9 km with about 1,160 m of elevation gain on a rolling course, so expect repeated changes in resistance where pacing discipline matters. The W wind at roughly 6.3 m/s means you’ll feel it more strongly on exposed sections—use it to stabilize effort: work a bit when you’re sheltered or on steadier sections, then avoid spiking power when the wind hits. Nutrition and hydration should start early and stay consistent: target carbs 90 g/hr, sodium 750 mg/hr, and fluid 650 ml/hr throughout the bike rather than trying to “catch up” later. On rolling terrain, take in fuel on the steadier stretches and keep your body position efficient so you don’t waste watts during climbs or accelerations; if you’re behind on fluids, correct gradually, not all at once.

Closing notes

As the bike winds down, tighten your plan for the run: stay smooth, keep taking in fluids until transition, and avoid letting the rolling effort turn into uncontrolled surges. Enter T2 feeling like you could hold the first 10–15 minutes of run—if your legs feel destroyed, your bike pacing was too hot.

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Weather is a 10-year climatology (typical, not a forecast). Course tracks are approximate, derived for planning — verify against the official course. Maps © OpenStreetMap. Not affiliated with or endorsed by the IRONMAN Group.