IRONMAN 70.3 Versailles
Sunday, 11 October 2026
IRONMAN 70.3 Versailles is a 1.9K freshwater swim, an 88.2K rolling bike with 619m of gain, and a 21.2K rolling run—expect moderate heat and a steady SW wind to shape pacing and fueling.
- 👍 Conditions are kind — the 600 ml/h fluid, 700 mg/h sodium and 90 g/h carbs baseline should hold. Fine-tune to your own thirst 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 →
Worlds qualification — 60 slots at this racesee who qualified →Get to the water early enough to settle your breathing rhythm. Line up based on expected pace so you’re not fighting slower swimmers for the first minutes. In the first 100–300m, focus on clean sighting and relaxed power—your goal is to establish rhythm, not to sprint the start.
You’ll cover 1900m in freshwater where temperature can vary, so manage effort by feel: if it’s cooler, your body may feel stiffer at the beginning—stay smooth and keep your kick compact. The race typically comes in waves around other athletes; choose an outside line when you need room to settle, then return to drafting-friendly positioning when safe. Because the swim is relatively short, you should be fueling zero on the water—save your intake for the bike and keep your transition mindset early (eat/drink plan first, “go hard” second). Focus on steady form and efficient strokes so you arrive at T1 calm and ready to transition quickly.
Finish controlled and get your breathing under control before you exit—your best swim outcome is arriving fresh for the 88.2K bike.
Run smart through T1: re-check your hydration position, secure helmet and eyewear before moving away from the line, and spend a few seconds getting cadence and gearing settled. The first minutes are about finding your rolling-rhythm—don’t let the excitement of a fast start override the need to match power to a course with 619m of elevation gain. If you’re near others, pass decisively but smoothly so you can lock in your line and breathing early.
The 88.2K bike is rolling with 619m of gain, so pacing should be “steady up, composed down.” With wind from the SW at about 4.9 m/s, you’ll likely feel cross/tail/headwind changes across different segments—stay calm when the wind hits and keep your steering inputs smooth on any gustier stretches. Plan to ride with a strong aerobic focus on climbs without spiking effort; on descents, prioritize stability and staying on your intended cadence rather than chasing speed. Fuel and hydration should be consistent: target about 90g carbs per hour, 600mg sodium per hour, and ~500ml fluid per hour—start early enough that you’re not behind halfway through the bike, and adjust fluid slightly if conditions feel cooler or you sweat less.
Roll the elevation—ride the climbs like a repeatable effort and the descents like controlled execution, while keeping carbs/sodium on schedule.
At T2, expect your legs to feel “fresh but heavy” for the first few minutes after the bike. Transition quickly but don’t rush your first steps: set posture, find a sustainable cadence, and let the rolling terrain settle your rhythm. Mentally commit to a controlled start—your job is to bank time slowly, not to sprint the early flats/early rollers.
The 21.2K run is rolling with 82m of elevation gain, which means you’ll feel frequent small changes in gradient—use them to manage effort rather than letting each rise force a surge. With moderate heat and a steady SW wind, you may alternate between feeling cool on exposed stretches and feeling more heat load when sheltered—use perceived effort to guide pace, especially as the body warms up. Hydration and sodium matter on this course: continue your fueling strategy from the bike mindset, using the same consistency principle so you don’t wait until you’re thirsty. If you’re approaching cramps, late-race slowing, or stomach discomfort, it’s usually because intake is behind—use the aid stations to protect timing rather than chasing catch-up.
Run the rollers by effort, not by watching the watch—keep cadence controlled early and let the course come to you.
The official wetsuit ruling and any race-day swim/water guidance are set by race officials—check the IRONMAN athlete guide and race morning updates rather than assuming temperature-based rules.
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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.