AI synthesis with sources · 3 min · edition 2026
The Cartagena 70.3 Bike: Flat on Paper, Not on the Road
90 km along the coast billed as "mostly flat" — but with bridges, a climb at the turnaround, possible wind on the way back, and an official elevation figure that doesn't add up.
The course in two lines
90 km out-and-back heading northeast on the road to Bucaramanga, along the Caribbean coast. You leave the city over a few bridges, roll along the sea, turn around, and come back with the walled city on the horizon. On paper it's the easiest leg of the day. On paper.
The mystery of the 1,046 meters
The official page describes the course as mostly flat. Yet the same page lists 1,046 m of elevation gain. The two numbers don't go together: 1,046 m over 90 km is the profile of a hilly race, not a coastal time trial. Race reports from the first edition (2016) mention bridges on the way out of the city, a few small rises, and a long, steep climb just before the turnaround: real stuff, but hardly a thousand meters. The sources disagree, and we're saying so plainly. What to do: when the official 2026 GPS file drops, download it and compare it with files from past editions. Don't build your pacing around a number nobody has verified.
The enemy is the way out
The real opponent isn't the elevation: it's the heat. Highs around 31°C and humidity over 80%. On the bike, airflow cools you down and tricks you into feeling fine; the bill comes due on the run. Several reports also flag wind on the course, especially on the return, and the official 2022 race video explicitly mentions a bike leg with plenty of wind and sun. Translation: if you burn watts in the first 45 km with a tailwind, the way back becomes a trap.
Set the outbound leg at 85-90% of your target watts and save the rest for the return. As a benchmark: a comfortable finisher's split is around 3:20, a mid-pack goal is 2:55, a top age-grouper 2:22 (our estimates, not official data).
Pavement, bridges, and gearing
The 2016 reports note rougher pavement on the stretches near Cartagena: make sure bottles and storage are secured properly, because the vibrations in the first and last kilometers will send everything flying. You don't need to overhaul the bike for the steep climb before the turnaround, but a 28 (or bigger) cassette lets you spin up without burning matches.
Aid stations: don't trust them blindly
In 2016 there were 4 aid stations, roughly every 19 km, with rigid bottles that were hard to squeeze while riding. Four water points over 90 km at 31°C is not enough if you're running on empty. Start self-sufficient: two bottles on the frame plus a hydration system between the aero bars, and treat the aid stations as backup, not your main plan.
Do this now
- Download the official GPS file as soon as it's published and verify the actual elevation gain.
- Simulate 90 km in the heat at target watts, with a headwind return if possible.
- Test your hydration setup in the aero position: it has to work without sitting up.
- Choose your gearing with the turnaround climb in mind, not the average gradient.
- Decide your power ceiling for the outbound leg ahead of time and write it on your handlebars.