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Race IntelligenceCambridge, United States

IRONMAN 70.3 Eagleman

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
13 June 2027
Swim
1.9 km
Bike
90 km
Run
21.1 km

Published route evidence. Final 2027 route pending. Checked 14 Sept 2026.

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 Eagleman actually gives you

You swim a tidal rectangle in the Choptank River, ride a truly flat 90 km loop through the Blackwater National Wildlife Refuge exposed to whatever wind is blowing, then run two out-and-backs along the river and through Cambridge's neighbourhoods. The flat bike tempts overriding; respect the wind and the run stays available.

Show distances in

Swim

1.9 km

Tidal River Rectangle

Setting
the brackish Choptank River at Gerry Boyle Park, against the tide outbound and with it inbound

A tidal river swim runs against the current outbound and with it inbound, so even splits by feel are misleading.

Source: 2027 current route

Bike

90 km

One-loop Pan-flat Country Roads

Setting
the Blackwater National Wildlife Refuge and open Eastern Shore farmland
Elevation
101 m published profile difference

Only 330 ft of gain over 90 km means the course is genuinely flat, but open marshland leaves it fully exposed to wind.

Source: 2027 current route

Run

21.1 km

Two Out-and-backs Along the River

Setting
the Choptank River and Cambridge's Algonquin neighbourhood

Two out-and-backs along the river punish a bike ridden too hard on a course with no hills to force restraint.

Source: 2027 current route
Where these course facts come from

These facts come from the organiser’s latest published material: swim, 2027 current route; bike, 2027 current route; run, 2027 current route. They describe the character of the course. They do not confirm the final 2027 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

Respect the tide

  1. 0–300 m

    The start

    Expect the current against you

    The outbound leg swims against the tidal current. Settle into effort rather than pace, since split times will look slow.

    • Seed honestly
    • Swim by effort, not pace

Bike

Ride the wind, not the flat

  1. 0 km–45 km

    Into the refuge

    The flat is a trap, not a gift

    With no hills to force pacing discipline, it's easy to override on a course this flat. Hold your number regardless of how easy it feels.

    • Cap opening effort
    • Fuel early

  2. 45 km–90 km

    Back through open country

    Respect the wind

    Open marshland and farmland leave the course exposed. Treat any wind as the real terrain and finish planned nutrition.

    • Ride the wind, not the flat
    • Finish planned nutrition

Run

Use both out-and-backs

  1. 0 km–10.5 km

    First out-and-back

    Start controlled

    Let the riverside opening settle before committing to pace.

    • Easy first aid station
    • Check posture

  2. 10.5 km–21.1 km

    Second out-and-back

    Earn the finish

    Only progress once the first half has held together.

    • Stay tall
    • Choose the last move late

04 Race week

What I would keep an eye on

There is no useful 2027 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
18.0–27.4°CDew point centred on 18.1°C
Wind and gusts
10.7 km/hGusts up to 38.9 km/hPrevailing direction WSW
Rain likelihood
Up to 85%Wet-surface uncertainty retained

Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-14.Historical comparison only. This is not a forecast for 2027.

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 2027 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 70.3 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 70.3 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 Eagleman 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 routeHalf-distance training plansTraining plans for the durability this course asks for.See the plans Personalised routeWork with me on the whole buildCoaching when you want the plan and race decisions joined up.See coaching

Further reading

ArticleHow to pace a 70.3 so you can still runThe longer version of the pacing logic behind this Race Card.ArticleFix the first ten minutes off the bikeUseful when an overridden flat bike needs to become controlled running.

Evidence

Sources and verification

Course status: Partially verified. The organiser’s descriptions and latest published route profiles are in use. The final 2027 route is not yet confirmed. Last checked 2026-09-14.