Courses · IRONMAN 70.3 · Buenos Aires, Argentina
The 2026 course · Powered by blamethecourse.com
89.8 km measured along the road and 73 m of climbing read off the ground, none of it long or steep enough to count as a climb.
Predict my bike split Your weight, your watts on each kind of road, road bike or TT bike: the course is already loaded, 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.
100% of the IRONMAN 70.3 Buenos Aires bike course is road where an aero position does most of its work: 89.8 km between −4% and +3%. 0.0 km (0%) climbs at 5% or more, where most riders sit up. What a TT bike is worth to you depends on your watts and how aero you are on each bike, so the page does not guess: ride it both ways in the predictor and compare the two.
| Kind of road | How much | Up |
|---|---|---|
| Steep, above 8% | none of it | — |
| Climbing, 5 to 8% | none of it | — |
| Climbing, 3 to 5% | none of it | — |
| Rising, 1 to 3% | 2.3 km | 41 m |
| Flat, −1 to 1% | 85.2 km | — |
| Descending, −4 to −1% | 2.3 km | — |
| Dropping, below −4% | none of it | — |
The same kinds of road the predictor asks about: there you set the watts you will hold and how you will sit on each.
Each piece named by what the ground is: the climbs, the flats and the descents.
| Piece of road | Length | Slope | Rise |
|---|---|---|---|
| Flat, 89.8 km from km 0.0 | 89.8 km | — | — |
This page describes the road; how long it takes depends on who rides it. Set your weight, the watts you will hold on each kind of road and how you will sit, and the predictor answers with your bike split and the band around it, climb by climb.
How the road was measured
The length is measured along the course file's own trace, because the mapped roads covered too little of it to measure along. Expect it to be out by as much as a GPS trace usually is: a few tenths of a percent.
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. A terrain model is the bare ground, so a bridge or an overpass reads as what is under it. The file's own altimeter said 342 m, near enough the same road.
The course as described from the course IRONMAN published for 2026. 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.
89.8 km with 73 m of climbing (0.8 m per km), none of it steep or long enough to count as a climb. The distance is measured along the course file's own trace, because the mapped roads did not cover enough of it, 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.
100% of it is road where an aero position does most of its work: 89.8 km between -4% and +3%. 0 km (0%) climbs at 5% or more, where most riders sit up. What a TT bike is worth to you depends on your watts and how aero you are on each bike: ride both in the predictor and compare the two.
That depends on you, so this page does not guess: open the course in the predictor. Set your weight, the watts you will hold on each kind of road and how you will sit, on a road bike or a TT bike, and it answers with your bike split and the band around it, climb by climb. Nothing to upload: the course is already there.