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Race IntelligenceGurye, South Korea

IRONMAN Gurye Korea

Know your day before you race it.

Enter four numbers you already train with. You get a likely finish range, target paces and watts, and how I would race this course.

Race day
4 October 2026
Swim
3.8 km
Bike
180 km
Run
42.2 km

Published route evidence. Final 2026 route pending. Checked 18 Sept 2026.

Official course routeThe real GPS route for each discipline with official GPX data available, drawn in one shared coordinate space.

01 Race Card

Build my Race Card

Your first range uses conservative assumptions. Add optional evidence to make it more specific. It is calculated in your browser and saved only on this device.

Your numbers
Distance unit
Weight unit
You and this race
Sharpen your range with more detailOptional. Recent swim, bike and run results, equipment and transitions.

Add only the evidence you have. Every control changes a discipline range, its uncertainty, or an execution-risk explanation.

Swim evidence

Replaces the broad pool-to-open-water assumption.

Bike and equipment

These replace broad mass, aerodynamics, tyre, and power-to-speed assumptions.

Run evidence

A recent effort and honest durability/acclimation answers refine the post-bike run.

Race execution

Transition proficiency changes the T1/T2 range and how wet conditions are treated.

02 The course

What Gurye Korea actually gives you

You swim in Guman reservoir at Jirisan Lake Park, ride a flat 180 km route beside Jirisan Mountain and the Sumjingang River through the Jirisan hotspring village, then run a hilly 42.2 km course beside the Seosicheon stream through farmland with the mountain in view. The organiser's own course page calls the bike flat and the run hilly, a direct contrast that decides the day: whatever the flat bike lets you get away with, the hilly run makes you answer for.

Show distances in

Swim

3.8 km

Reservoir

Setting
Guman reservoir, Jirisan Lake Park

A calm reservoir swim in Jirisan Lake Park, with clear water and no current or surf to manage, gives the simplest possible start to the day.

Source: 2026 current route

Bike

180 km

Flat, Beside a Mountain and River

Setting
beside Jirisan Mountain and the Sumjingang River, through the Jirisan hotspring village

A flat route beside Jirisan Mountain and the Sumjingang River offers nothing to check an effort that creeps too high before the run.

Source: 2025 file, current course page

Run

42.2 km

Hilly, Riverside Farmland

Setting
beside the Seosicheon stream, through farmland with Jirisan Mountain in view

The organiser's own stat card labels this run hilly, in direct contrast to the flat bike, so whatever the bike leaves in your legs gets spent on real terrain.

Source: 2025 file, current course page
Where these course facts come from

These facts come from the organiser’s latest published material: swim, 2026 current route; bike, 2025 file, current course page; run, 2025 file, current course page. They describe the character of the course. They do not confirm the final 2026 route.

03 Race plan

How I’d want you to race it

One job for each part of this course. The distance markers tell you when the job changes. The course tells you why.

Swim

A calm reservoir start

  1. 0–3800 m

    Guman reservoir

    Use the calm water to settle, not to sprint

    A reservoir swim with clear water and no current gives the most predictable start of the day. There is nothing to fight here, so settle into rhythm rather than racing the flat water.

    • Settle by 400 m
    • Find feet early and hold position

Bike

Flat is not free speed

  1. 0 km–60 km

    Out beside the Sumjingang River

    Set a ceiling before the flat road tempts you past it

    The route runs beside Jirisan Mountain and the Sumjingang River on largely flat, controlled roads. Flat terrain hides a power number that is quietly too high, and this is where that number gets set.

    • Cap power in the first hour
    • Start fuelling early on the smooth roads

  2. 60 km–120 km

    Through the hotspring village

    Hold the ceiling through the middle hours

    Passing the Jirisan hotspring village and into the dense forest air, the flat terrain continues to offer no natural check on effort. Hold the number you set, not the one the road allows.

    • Stay on the fuelling schedule
    • Recheck power against your plan, not your legs

  3. 120 km–180 km

    Closing along the riverside road

    Finish the flat bike still owing the run nothing

    The final riverside stretch back toward transition is where a flat course's real cost shows up, on the run still to come rather than here. Protect the run by respecting the ceiling to the line.

    • Finish nutrition before T2
    • Resist any late push on the flat finish

Run

The hills are where the bike's bill arrives

  1. 0 km–10.5 km

    Onto the hilly Seosicheon course

    Meet the hills the course actually has

    The organiser labels this run hilly, a direct contrast to the flat bike. Start conservatively: the terrain, not the pace you feel capable of, sets the honest early effort.

    • Shorten stride on the first rises
    • Hold effort, not pace, on any climb

  2. 10.5 km–21 km

    Beside the Seosicheon stream

    Bank the flat sections, respect the hills

    Running beside the Seosicheon stream through farmland mixes flatter stretches with real climbing. Use the flat sections to recover, and keep the same discipline on every rise.

    • Recover on flat sections
    • Keep effort even on repeated climbs

  3. 21 km–31.5 km

    Deeper into farmland

    This is where a too-hard flat bike shows up

    If the flat bike was ridden to the road rather than to a plan, this is where the hills expose it. Manage the effort you actually have rather than the one you hoped for.

    • Reassess goal pace honestly
    • Keep taking aid on schedule

  4. 31.5 km–42.2 km

    Farmland to the finish

    Spend what a disciplined flat bike left you

    The closing kilometres carry the same farmland and mountain views back toward the finish. If the bike stayed honest, this is where a hilly run still pays off.

    • Decide the finish honestly
    • Run the last hills on effort, not memory of pace

04 Race week

What I would keep an eye on

There is no useful 2026 forecast this far out. For now, past race dates give us a point of reference. Closer to the race, the forecast will tell us whether the plan needs changing.

Forecast statusToo early for a forecast

A race-day forecast is not meaningful yet; check back closer to the event.

Temperature
14.2–25.6°CDew point centred on 15.1°C
Wind and gusts
5.9 km/hGusts up to 36.4 km/hPrevailing direction WNW
Rain likelihood
Up to 75%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-18.Historical comparison only. This is not a forecast for 2026.

05 Method

What goes into your range

Your CSS, FTP, weight and run threshold create the first range. Open-water, bike, run and execution evidence can replace broad assumptions. Course data and the historical conditions baseline shape every simulation.

  1. Your numbersCSS · FTP · weight · run threshold
  2. This raceDistance · water type · elevation · exposure
  3. Your Race CardFinish and discipline ranges, with target paces and watts

Confidence is built from four inputs

Athlete evidence
Builds with recent open-water, bike and run efforts
Bike setup
Builds with equipment, mass, aero and tyre detail
Course evidence
Partial while the 2026 route is unconfirmed
Race-week conditions
Historical baseline until a forecast is useful
How the model works

It starts with the targets in your Race Card, then samples the parts of a full distance that vary: open-water pace, transitions, bike speed at the planned power, and the drop in run performance after the swim and bike. Repeating that calculation produces a likely range rather than a single heroic number.

The current time calculation uses this race’s published distances, or standard full distance distances where none are published, with the available course headings, elevation and exposure evidence. Weather scenarios vary temperature, dew point, wind, gusts, rain and water conditions together. Unknown route detail stays visible as uncertainty rather than false precision.

It is not predicting your exact finishing time, placing, or race-day weather. It answers a narrower question: given the plan and the information we have, what range of day is plausible, and where is the uncertainty coming from?

Confidence is not a permanent “low”. It is recalculated across four separate inputs:

  • Your evidence: consistent inputs and recent race-like swim, bike, and run results.
  • Bike setup: measured or specified aerodynamics rather than a broad prior.
  • The course: verified distance and route character, including elevation and technical sections.
  • The conditions: a current forecast is more useful than a historical comparison.

It starts low when those inputs are broad. It can become moderate or high as the evidence improves. A narrower range means better information, not a guarantee.

06 Next steps

If Gurye Korea is your race

Your range is built on today’s numbers. The months of training before race day decide what those numbers become.

The work from here.

Self-guided routeFull-distance training plansTraining plans for the climbing durability this run asks for.See the plans Personalised routeWork with me on the whole buildCoaching when you want the plan, feedback and race decisions joined up.See coaching

Further reading

ArticleFull-distance race strategy: calm execution beats chaosThe pacing discipline a flat bike into a hilly run demands.ArticleFix the first ten minutes off the bikeUseful before a run the organiser itself calls hilly.

Evidence

Sources and verification

Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2026 route is not yet confirmed. Last checked 18 Sept 2026.