70.3

IRONMAN 70.3 Da Nang

Sunday, 9 May 2027

IRONMAN 70.3 Da Nang is a fast, flat course (1916m swim/90.6km bike/21.3km run) where hot, slightly breezy conditions make disciplined fueling and smooth transitions the difference-maker.

· 217 days to go
Air
26–32°
typical
Wind
5 SE
prevailing
Water
28.1°
typical — confirm
Bike climb
+127 m
Fueling — per hour
typical conditions
80 g
carbs
-10 g vs typical
1250 mg
sodium
+500 mg vs typical
975 ml
fluid
+325 ml vs typical
  • 💧 Plan fluids toward 975 ml/h (cap near 1–1.2 L/h and let thirst be the ceiling). It typically runs hot through the afternoon.
  • 🧂 Lift sodium to ~1250 mg/h.
  • 🍚 Hold carbs at 80 g/h — heat slows carb absorption, so more isn't better.
  • ⏱️ Sodium preload: ~500–750 ml with ~1,000 mg sodium, 60–90 min before the start.
Build your fuel plan — which gels, how many per hourFuel tool →
Based on 10-year typical conditions (~32°). Baseline for a ~5.5 h finish, 70 kg athlete. Scale to your own body mass and sweat rate.

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

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0 km45 km91 km36 m
90.6 km · +127 m climbing
T1 — swim to bike

Your swim-to-bike transition is about organization: rack efficiently, confirm gear placement, and don’t rush so hard that you forget hydration. As you remount, settle into a smooth cadence immediately—don’t “spike” power off the mount. Think of the first few kilometers as dialing in: straighten your steering line, get your body temperature managed, and start your fueling/drinking early so you’re not catching up later.

During the bike

You’ll ride 90.6km with 127m of gain on a flat/fast profile—so power discipline and aerodynamics matter more than climbing fitness. With SE winds around 5 m/s, you may feel light crosswinds or head/tail variations; stay calm on any gusty sections and avoid over-correcting your line. Heat is a factor, so use the full fueling target: about 90g carbs per hour, 1000mg sodium per hour, and roughly 800ml fluid per hour, starting early and staying consistent. Take advantage of the “flat” nature—hold steady output rather than surging at every aid moment, and drink consistently even if you don’t feel thirsty yet.

Closing notes

On a flat/fast day, your best advantage is steady power and steady intake—don’t let the wind or the heat turn you into a surge-and-suffer rider.

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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.