Courses · IRONMAN 70.3 · Durban, South Africa
91.3 km measured along the road and 558 m of climbing read off the ground, in 2 climbs.
Predict your time on this courseYour weight, your watts for each kind of slope, your position. Nothing to upload.
A model, not a measurement. What it can show depends on the numbers above — what you typed, and what your files recorded — and on assumptions this page states; anything it cannot stand behind says so rather than drawing a tidier line.
Each piece named by what the ground is: the climbs, the flats and the descents.
| Piece of road | Length | Slope | Rise |
|---|---|---|---|
| Flat, 18.6 km from km 0.0 | 18.6 km | — | 33 m |
| Descent, 1.5 km at 2.4% from km 18.6 | 1.5 km | -2.4% | — |
| Climb, 3.3 km at 2.8% from km 20.1 | 3.3 km | 2.8% | 92 m |
| Flat, 2.7 km from km 23.4 | 2.7 km | — | — |
| Descent, 3.7 km at 2.3% from km 26.1 | 3.7 km | -2.3% | — |
| Flat, 31.9 km from km 29.8 | 31.9 km | — | 29 m |
| Descent, 1.5 km at 2.4% from km 61.7 | 1.5 km | -2.4% | — |
| Climb, 3.3 km at 2.8% from km 63.2 | 3.3 km | 2.8% | 92 m |
| Flat, 2.7 km from km 66.5 | 2.7 km | — | — |
| Descent, 3.7 km at 2.3% from km 69.2 | 3.7 km | -2.3% | — |
| Flat, 18.3 km from km 72.9 | 18.3 km | — | — |
Predict your time on this courseThis page describes the road. How long it takes depends on who rides it.
How the road was measured
The length is measured along the mapped roads (OpenStreetMap), which 68% of the route followed, rather than along a GPS trace, which is longer or shorter than the road by however far its receiver wandered. The course file itself said 90.2 km, and a head unit measuring its own trace will read something close to that.
The climbing is read off a terrain model of the ground, averaged along the road, rather than off a barometer, which cannot tell a change in the weather from a hill. The file's own altimeter said 671 m, near enough the same road.
The course as described from the course IRONMAN published for 2027. watts & time is not connected with the event or its organisers; a course changes from year to year, so check the current one before you plan on it.
91.3 km with 558 m of climbing, in 2 climbs. The distance is measured along the mapped roads (OpenStreetMap) rather than a GPS trace, and the climbing is read off a terrain model of the ground rather than a barometer, which drifts with the weather, so a head unit will often show slightly different figures.
In the order you meet them: Climb, 3.3 km at 2.8% from km 20.1; Climb, 3.3 km at 2.8% from km 63.2.
That depends on you, so the page does not guess: open the course in the predictor. Set your weight, the power you will hold on each kind of slope and the position you will ride in, and it answers with the time and the band around it, climb by climb. Nothing to upload: the course is already there.