The IRONMAN 70.3 Asunción Bike Leg: 90 km Billed as Flat, Zero Hard Data

What we actually know

Not much. The official course page labels the bike leg as flat: 90 km starting and finishing at the El Delta complex in Nueva Asunción. Elevation gain isn't published. There's no final map. And there's one more problem: the descriptive text on the official site mentions climbs and mountain passes, directly contradicting the 'flat' tag. It's almost certainly placeholder copy pasted from a template. Don't base a single minute of training on it.

This is a first edition, so there are no race reports, Strava files, or reference splits. Everything that follows is a cautious prep for the most likely scenario: a flat or near-flat course in a riverside area.

The real opponent: the wind

On a flat course there are no climbs to break up the rhythm—but no descents to recover on either. You're pedaling the whole time. In that scenario, wind becomes the variable that decides the race, especially in open terrain near the river.

What to do in training:

• Train to hold the aero position for long stretches. Continuous 40-60 minute blocks on the aerobars, without sitting up. If your neck and traps hurt after 30 minutes, you have a fit problem to fix months out—not on race day.
• Work on steady watts. On a flat course, ideal pacing is almost a time trial: pick a sustainable target power (for a 70.3, typically around 80-85% of FTP for trained athletes) and hold it. No surges to pass, no fading in headwind sections.
• Simulate headwinds. If you train in a sheltered area, use the trainer for long blocks at controlled cadence: windy flats punish anyone who can't grind.

Gearing and equipment

With no elevation data, the sensible choice is a standard or compact crankset with a normal cassette. If the final maps confirm it's flat, you can think about taller gearing and deep-section wheels—but remember that deep rims in strong crosswinds are a risk, not an automatic advantage. Decide on wheels only after you've seen the map and the race-week weather forecast.

The morning cold

July is winter in Paraguay: average lows around 11°C, highs of 22°C. That means you'll start the bike wet, in cool air, probably between 7 and 9 a.m. The first 30-45 minutes can be genuinely cold.

Concrete plan:

• Arm warmers rolled down at the wrists in T1, pulled up while riding.
• A light wind vest, or the classic newspaper under your jersey to toss at the first aid station.
• Decide the night before based on the actual forecast, not seasonal averages.

Your action plan

1. Now: build your training around a windy flat course. Long aero blocks, steady watts, zero improvisation. 2. When the final maps drop: check elevation gain, number of laps, corners, and U-turns. A flat multi-lap urban course has lots of accelerations: it changes the type of effort. 3. Race week: check the wind forecast and pick your wheels accordingly. 4. Plan B: if the final map contradicts the 'flat' tag and real climbs appear, you have until July 2027 to adjust gearing and training. Keep an eye on the athlete guide: on a first edition, details can change right up to the last minute.

The bottom line is brutal but honest: all you know today is that it's 90 km, probably flat. Prepare for that, verify everything else, and don't trust the official blurb.