# IRONMAN Knokke-Heist — full-distance IRONMAN race guide

> Course, typical race-day conditions and fueling for IRONMAN Knokke-Heist, from metrica.fit. HTML version: https://www.metrica.fit/races/im-knokke-heist

- **Date:** Sunday 5 September 2027
- **Location:** Europe · 51.3500, 3.2667
- **Distance:** full-distance IRONMAN

## Key facts

- IRONMAN Knokke-Heist is on Sunday 5 September 2027.
- It is a full-distance IRONMAN: 3.8 km river swim, 180.2 km bike, 42.2 km run.
- Typical race-day air temperature is 14–21.6 °C with a 5.7 m/s (21 km/h) wind from the SW (10-year climatology, not a forecast).
- For a typical ~12 h finish in moderate conditions, plan about 90 g of carbohydrate, 750 mg of sodium and 650 ml of fluid per hour.

## Course

| Leg | Distance | Elevation gain | Source |
| --- | --- | --- | --- |
| Swim (river) | 3.8 km |  | course data |
| Bike | 180.2 km |  | standard distance |
| Run | 42.2 km |  | standard distance |

## Race-day notes

IRONMAN Knokke-Heist is a 3.8 km river swim followed by a 180 km bike and a 42.2 km run, paced around moderate heat and a consistent SW wind.

**Swim.** This is a 3801 m river swim where water temperature varies, so expect some fluctuation in comfort and don’t let that push you into overreaching. The river setting can mean currents and changing water texture/sight lines; stay patient with your line and sight often enough to keep your effort steady. Plan to drink nothing during the swim—your job is to exit controlled and ready to remount quickly for the bike. Aim to keep your stroke rate smooth and your breathing rhythm consistent through the distance so you can transition well rather than arriving to T1 exhausted. If conditions feel choppy or visibility drops, shorten your sighting intervals and focus on maintaining forward momentum with minimal extra energy. Swim steady through the distance—your goal is an efficient exit and a calm transition, not a time trial. If the water feels different than expected, adjust effort immediately and focus on rhythm until you hit shore.

**Bike.** Wind is 5.7 m/s from the SW, which can affect stability and comfort—expect some aerodynamic penalty and plan for smooth steering inputs, especially on any crosswind or exposed sections. With moderate heat, prioritize cooling through fluid intake and don’t let perceived effort climb due to rising body temperature. Fuel for the full ride using the targets: 90 g carbs per hour, 750 mg sodium per hour, and 650 ml fluid per hour, adjusted only to keep you consistent with those targets across the day. Drink and eat regularly from the start, aiming for a steady rhythm rather than occasional large intakes. Control the first part of the bike to protect your run legs. With SW wind, keep your bike handling smooth and hit your planned carbs/sodium/fluid rhythm every hour.

**Run.** The run is 42.2 km after 180 km of riding, so the biggest factors are heat management and staying on top of fueling. Air temperature spans 14 to 21.6°C with moderate heat, but don’t assume it will stay cool—use fluid to manage body temperature before you feel overwhelmed. The SW wind can still be felt on the course and may change how steady your effort feels from lap to lap; keep your pacing disciplined and avoid chasing “fast” segments that cost you later. Use your fueling plan consistently throughout the run; target 90 g carbs per hour, 750 mg sodium per hour, and 650 ml fluid per hour to maintain performance and reduce the risk of late-race depletion. Eat/drink regularly at aid stations as needed to match the same hourly targets, and prioritize fluids earlier than you think you need—especially if the wind and sun combine to dry you out. Run controlled and fuel on schedule—this course rewards steady effort over early surges. Keep cadence smooth, and use fluids and sodium to prevent the late fade.

**Weather.** Adjust effort to conditions: use steady pacing and disciplined fueling (90 g carbs/hr, 750 mg sodium/hr, 650 ml fluid/hr) to stay consistent in wind and moderate heat.

## Links

- Race guide (HTML): https://www.metrica.fit/races/im-knokke-heist
- Fuel plan for this race: https://www.metrica.fit/fuel?preset=ironman&sport=tri&hours=12&intensity=race&race=im-knokke-heist&racename=IRONMAN+Knokke-Heist&carbs=90&sodium=750&fluid=650&temp=22
- JSON: https://www.metrica.fit/api/public/races/im-knokke-heist
- Official race page: https://www.ironman.com/races/im-knokke-heist

Source: metrica.fit. Weather is a 10-year climatology (typical, not a forecast); course distances and climbing come from derived, approximate course tracks. Wetsuit rulings and cutoffs are set by the organiser — confirm in the official athlete guide. Not affiliated with the IRONMAN Group.