The Phu Quoc Bike Course: 148 Meters of Climbing, But Don't Call It Easy

The Course by the Numbers

91.3 km around the southern half of the island, official elevation gain 148 m. On paper it's one of the fastest bike courses on the 70.3 circuit. The highlight is a roughly 15 km straightaway with no tight turns: locked-in aero position, steady watts, zero surges. If holding stable power for long stretches is your strength, this is your terrain.

The Factor You Won't See on the Elevation Profile

The official data says flat. But several race reports and comments from past editions — unverified, to be fair — mention wind and choppy sections on the course. Videos from the 2023 edition also show a race defined by sun and wind. On an island in the Gulf of Thailand that's no surprise: open coastal roads, little shelter.

What this means in practice: don't plan your race around a hypothetical average speed for a flat, windless course. Plan it around watts. If the wind shows up, your average drops and your time stretches out, but your target watts stay the same. Anyone chasing average speed into a headwind torches their run.

How to Prepare for It

• Train in aero, for long stretches. The 15 km straightaway rewards riders who can stay in position for 20-30 minutes without sitting up. Do blocks of 2x30' or 3x20' at race intensity, in position, without coming off the aerobars.
• Work on crosswinds. If you have deep-section wheels or a disc, test them on windy days before deciding whether to race them. Disc wheels are allowed, barring organizer restrictions: check the pre-race communications.
• Set up your gearing for surges, not climbs. With 148 m of gain you don't need climbing gears. You need a range that lets you spin a smooth cadence into headwinds and through direction changes.

Pacing: The Real Opponent Starts Later

At Phu Quoc you ride the bike thinking about the run. Air temps up to 32 °C and a flat, sun-exposed half marathon are waiting for you at T2. On a fast course the temptation to push is huge, because speed comes easy. Resist it: every watt above your sustainable threshold costs you double in the heat on the run.

Rule of thumb: pick a conservative power target (for many age-groupers, 70-75% of FTP for a hot half) and hold it even when the straightaway tempts you to overdo it. If you feel too good at the halfway point of the bike, you're doing it right.

Bike Nutrition: This Is Where You Win the Run

The bike is the only place you can take in fluids and carbs consistently. In these temperatures your fluid and sodium needs go up: figure out ahead of time how many ml and how many mg of sodium per hour you need, and test it in training in the heat. Important logistical note: a personal needs bag is allowed, but it cannot be carried on the bike. Everything you need for the 91 km has to fit on the frame or come from the official aid stations. Plan accordingly.

What to Do Now

1. Set your race watts and validate them in a long test in aero position. 2. Ride in crosswinds and decide now which wheels to use. 3. Rehearse your full nutrition plan on a long ride in the heat: bottle cages, quantities, timing. 4. Have a mental plan B ready: if the wind is there, average speed doesn't matter, watts do.

The course is fast. But at Phu Quoc, a fast bike is the one that leaves you legs to run in 32 °C heat.