Courses · IRONMAN · Chattanooga, TN, USA
The 2026 course · Powered by blamethecourse.com
182.3 km measured along the road and 1625 m of climbing read off the ground, in 10 climbs.
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.
Each piece named by what the ground is: the climbs, the flats and the descents.
| Piece of road | Length | Slope | Rise |
|---|---|---|---|
| Flat, 2.8 km from km 0.0 | 2.8 km | — | — |
| Climb, 1.8 km at 2.9% from km 2.8 | 1.8 km | 2.9% | 53 m |
| Descent, 1.3 km at 2.9% from km 4.6 | 1.3 km | -2.9% | — |
| Climb, 1.8 km at 4.3% from km 5.9 | 1.8 km | 4.3% | 80 m |
| Flat, 10.1 km from km 7.8 | 10.1 km | — | — |
| Descent, 1.4 km at 3.7% from km 17.9 | 1.4 km | -3.7% | — |
| Flat, 29.9 km from km 19.3 | 29.9 km | — | 2 m |
| Climb, 1.3 km at 3.4% from km 49.3 | 1.3 km | 3.4% | 44 m |
| Flat, 10.1 km from km 50.6 | 10.1 km | — | 34 m |
| Descent, 2.5 km at 3.4% from km 60.7 | 2.5 km | -3.4% | — |
| Climb, 1.6 km at 4.9% from km 63.1 | 1.6 km | 4.9% | 81 m |
| Flat, 10.2 km from km 64.8 | 10.2 km | — | — |
| Descent, 1.4 km at 3.6% from km 75.0 | 1.4 km | -3.6% | — |
| Flat, 29.9 km from km 76.4 | 29.9 km | — | 3 m |
| Climb, 1.3 km at 3.4% from km 106.3 | 1.3 km | 3.4% | 43 m |
| Flat, 4.8 km from km 107.6 | 4.8 km | -0.5% | — |
| Climb, 1.2 km at 4.4% from km 112.4 | 1.2 km | 4.4% | 53 m |
| Flat, 4.1 km from km 113.5 | 4.1 km | — | 5 m |
| Descent, 2.4 km at 3.4% from km 117.6 | 2.4 km | -3.4% | — |
| Climb, 1.6 km at 5.0% from km 120.0 | 1.6 km | 5.0% | 81 m |
| Flat, 10.2 km from km 121.7 | 10.2 km | — | — |
| Descent, 1.4 km at 3.6% from km 131.8 | 1.4 km | -3.6% | — |
| Flat, 29.9 km from km 133.2 | 29.9 km | — | 2 m |
| Climb, 1.1 km at 3.3% from km 163.1 | 1.1 km | 3.3% | 36 m |
| Flat, 5.0 km from km 164.2 | 5.0 km | — | — |
| Climb, 1.2 km at 4.4% from km 169.2 | 1.2 km | 4.4% | 53 m |
| Flat, 4.0 km from km 170.4 | 4.0 km | — | 5 m |
| Descent, 2.0 km at 4.1% from km 174.4 | 2.0 km | -4.1% | — |
| Climb, 1.3 km at 3.1% from km 176.5 | 1.3 km | 3.1% | 42 m |
| Descent, 1.7 km at 3.0% from km 177.8 | 1.7 km | -3.0% | — |
| Flat, 2.8 km from km 179.5 | 2.8 km | — | 7 m |
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 2547 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.
182.3 km with 1625 m of climbing, in 10 climbs. 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.
In the order you meet them: Climb, 1.8 km at 2.9% from km 2.8; Climb, 1.8 km at 4.3% from km 5.9; Climb, 1.3 km at 3.4% from km 49.3; Climb, 1.6 km at 4.9% from km 63.1; Climb, 1.3 km at 3.4% from km 106.3; Climb, 1.2 km at 4.4% from km 112.4; Climb, 1.6 km at 5.0% from km 120; Climb, 1.1 km at 3.3% from km 163.1; and 2 more.
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.