# IRONMAN 70.3 Mamaia — IRONMAN 70.3 race guide

> Course, typical race-day conditions and fueling for IRONMAN 70.3 Mamaia, from metrica.fit. HTML version: https://www.metrica.fit/races/im703-mamaia

- **Date:** Sunday 26 September 2027
- **Location:** Europe · 44.1807, 28.6343
- **Distance:** IRONMAN 70.3

## Key facts

- IRONMAN 70.3 Mamaia is on Sunday 26 September 2027.
- It is an IRONMAN 70.3: 1.9 km sea swim, 87 km bike, 20.3 km run.
- Usually wetsuit-legal: typical race-week water is 22.5 °C, below the 24.5 °C (76.1 °F) age-group limit. The official ruling is made on race morning.
- The 87 km bike climbs about 261 m in total (flat for a 70.3 bike).
- The 20.3 km run climbs about 25 m (flat).
- Typical race-day air temperature is 15–21.1 °C with a 6.6 m/s (24 km/h) wind from the NE (10-year climatology, not a forecast).
- For a typical ~5.5 h finish in moderate conditions, plan about 90 g of carbohydrate, 750 mg of sodium and 650 ml of fluid per hour.
- Free 16-week training plan for this race (about 10 hours a week, starting Monday 2027-06-07): https://www.metrica.fit/races/im703-mamaia/training-plan

## Course

| Leg | Distance | Elevation gain | Source |
| --- | --- | --- | --- |
| Swim (sea) | 1.9 km |  | course data |
| Bike | 87 km | 261 m (flat) | course data |
| Run | 20.3 km | 25 m (flat) | course data |

## Race-day notes

IRONMAN 70.3 Mamaia (1.9K sea swim, 87K flat/fast bike, 20.3K flat/fast run) is a fast-course day where steady fueling and wind-aware riding decide your finish.

**Swim.** You’ll swim 1,900 meters in sea water at around 22.5°C, where wetsuit use is expected to be legal, but confirm the official ruling on race morning in the IRONMAN athlete guide. With a sea venue, anticipate some chop and current variation, so keep your head position stable and sight frequently enough to stay on line without repeatedly “reaching.” The goal in this swim is clean, efficient propulsion—arrive at T1 composed rather than gasping, because the bike is flat/fast and you’ll want your legs fresh. Fueling during the swim is typically not practical; focus on hydration readiness (you should be able to start drinking at T1) and make sure you’re not under-breathing when you transition out of the water. Smooth line over intensity—finish the swim steady so your first bike power set and cadence stay controlled.

**Bike.** The bike is 87 kilometers with 261 meters of elevation gain and a flat/fast profile—perfect for building a steady, aerodynamic effort rather than “spiking” power. You’ll ride in wind conditions of about 6.6 m/s from the NE, so expect the headwind/tailwind pattern to change where you’re exposed; ride a little lower and quieter into wind to protect speed and save energy. Aim for consistent power and smooth cadence; if gusts rise, resist surging—stay composed and let your speed fluctuate. For fueling, target 90 g carbs per hour, 750 mg sodium per hour, and about 650 ml fluid per hour: start early (within the first part of the ride) and keep intake regular rather than trying to catch up later. On a flat course, this is where you lock in your nutrition cadence while using the wind to your advantage—draft where allowed, and on exposed sections, stay stable in your aero position and avoid abrupt steering corrections. Wind-aware, steady power: keep effort consistent and hit your carbs/sodium/fluid rhythm early and continuously.

**Run.** The run is 20.3 kilometers with 25 meters elevation gain and a flat/fast profile, which means the main battle is managing effort as the race gets quick. Conditions are typically moderate heat with air temperatures that can be around the 15–21.1°C range, so you should be able to run strong without needing to radically slow down—just don’t overestimate how easy the early kilometers feel. With the same NE wind influencing the course, expect it to feel stronger on exposed portions; use it as a pacing tool (hold your effort when wind is unfavorable and don’t chase pace when you’re getting pushed around). Nutrition should continue from the bike plan—if you’ve been hitting 90 g carbs/hour on the bike, keep the transition smooth so you don’t arrive with a fuel gap. Aim to drink consistently and avoid “chasing” thirst with big intakes late—small, regular sips keep performance stable. Since the course is flat, your form matters: keep strides smooth and efficient as fatigue accumulates, and protect your cadence from dropping in the final third. Controlled starts, steady fueling, and form focus—flat course rewards rhythm more than heroics.

**Weather.** Use the wind to guide effort: steady power on the bike, controlled pace on the run, and keep nutrition intake regular (90 g carbs, 750 mg sodium, ~650 ml fluid per hour on the bike).

## Links

- Race guide (HTML): https://www.metrica.fit/races/im703-mamaia
- Fuel plan for this race: https://www.metrica.fit/fuel?preset=im703&sport=tri&hours=5.5&intensity=race&race=im703-mamaia&racename=IRONMAN+70.3+Mamaia&carbs=90&sodium=750&fluid=650&temp=21
- JSON: https://www.metrica.fit/api/public/races/im703-mamaia
- Official race page: https://www.ironman.com/races/im703-mamaia

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.