Manta's Bike Leg: 90 Rolling Kilometers That Punish Anyone Who Only Reads 'Flat'

The Numbers

The bike leg at IRONMAN 70.3 Manta covers 90 km over two laps. The official course page lists 2,555 feet of elevation gain, about 779 meters, and describes the route as challenging and fun, on wide, safe roads. The profile mapped by PJAMM Cycling shows a slightly lower figure, around 667 meters. The two sources diverge, but the message is the same: this is not a flat course. If the word 'flat' shows up in your search results, ignore it and look at the elevation profile.

What Kind of Course It Is

No long climbs, no mountain passes. The elevation accumulates through repeated rollers: classic punchy terrain. Over 90 km, 700-780 meters of gain means a low average gradient but constant kickers. It's the kind of course where age-groupers lose more time than they think: not because of the climbs themselves, but because of how they ride them.

Pay attention to the course history too: in the 2021 edition the bike was a single out-and-back toward Crucita, while today the official page lists two laps. The course has changed and could change again. Before planning your pacing, download the latest map from the official site and, if possible, load it onto your bike computer.

How to Manage Your Watts

On nonstop rollers the temptation is to surge on every little climb and ease off on the descents. That's the mistake that costs the most. The right plan:

• Short climbs: keep power within 105-110% of your race target. No over-threshold efforts to gain ten seconds.
• Descents and false flats: keep pedaling. That's where steady pacing claws back what others burn on the climbs.
• Conservative first lap: you get two passes over the same course. Use the first lap to learn the gradients and turn points, and save something for the second, when the sun will be higher.
• Disciplined second lap: traffic from lapped athletes and rising temperatures (average highs of 28°C) make the second lap more chaotic. A written power plan keeps you from getting dragged along.

Gearing and Equipment

With a course officially described as rolling and challenging, pick gearing that lets you climb seated and spinning: for many age-groupers an 11-30 or 11-32 cassette makes more sense than a flat-TT 11-25. Mid-to-deep section wheels remain a good choice: the roads are described as wide and safe, and the rollers don't call for climber's setups. There's no documented wind data in the sources: the course sheet itself states that the wind index is a conservative estimate. Plan B: if you find strong ocean breeze in the days before, consider a more conservative front wheel depth.

Heat and Hydration on the Bike

The bike is where the half marathon gets set up (or ruined). With average highs of 28°C and coastal humidity, hydration and electrolytes start from kilometer one on the bike, not at T2. Drink at regular intervals from the start, even if you're not thirsty: in Manta the flat, fast run will only reward those who get off the bike hydrated.

What to Do Now

Three concrete actions: first, build specific work on continuous rollers into your training (2-4 minute repeats slightly above race threshold, with easy-spinning recovery); second, check the latest official course map before leaving for Ecuador; third, decide on your gearing now and test it in training on similar terrain, not on race day.