The Zell am See-Kaprun bike course: 90 km that decide your race

The numbers first

About 90 km on a single loop through Zell am See, Kaprun and the surrounding villages, in a full alpine setting. A third-party source (Rouvy) lists roughly 89 km and 1,037 m of elevation gain, with max gradients around 16%. These are ballpark figures from recent editions: verify the official 2027 map before locking in your plans. But the picture is clear: this is no flat TT-style 70.3. Over 11 m of climbing per kilometer on average, concentrated in one section of the course. Local tourist material also mentions a stretch near Kaprun castle: nice scenery, but you should be watching the profile, not the view.

The climb: where it all gets decided

The course is described as a demanding climb followed by a fast descent. Exactly where the climb falls hasn't been verified from available sources: study the official profile as soon as it's released and, if you can, do a virtual recon on the route published by Rouvy. What's certain: with pitches around 16%, you don't muscle your way up. You need easy gearing. If you ride 52/36 with an 11-28, seriously consider an 11-32 or 11-34: at the same wattage, spinning 75-85 rpm uphill leaves your legs much fresher for the run.

The descent: free speed only if you can handle a bike

After the climb comes a fast descent. Several sources describe this section as quick, and in the mountains the road surface and weather can change fast. Two rules: check your brakes and tire pressure in the days before, and practice your lines in training. Good bike handlers pick up free minutes here without spending a single watt. Poor handlers lose them and add risk. If you're on a TT bike with rim brakes and limited confidence, train descents in the months leading up: it's a skills job, not a fitness job.

Pacing: the run is built on the bike

Stay below threshold on the climb, always. The time you gain pushing 95% of FTP uphill, you pay back with interest on the half marathon. A practical reference for age-groupers: climb at 80-85% of FTP, rolling sections at 75-80%, descent as active recovery, pedaling where you can. Reference bike splits on this course: 3:30 for a comfortable finisher, 3:00 for sub 5:30, 2:42 for sub 5:00, 2:28 for sub 4:30. If your usual flat split is faster, add margin here: you pay for the elevation.

Alpine weather: dress for plan B

In late August, typical air temps are 15-25 °C, but it can get cooler in the mountains and the weather changes fast. On the descent, after a sweaty climb, the cold bites. Stash a lightweight rain jacket and gloves in T1: 30 extra seconds in transition are worth far more than descending stiff with cold.

What to do now

• Gearing test: find a long climb near home and check that at 80% of FTP you can hold at least 75 rpm. If not, swap the cassette.
• Specific blocks: 20-40 minute climbs at steady effort, then an actively ridden descent. That's the race.
• Nutrition: 60-90 g/h of carbs on the bike, tested in training on your hilliest routes. Eating and drinking is harder on a climb: plan where you'll do it.
• Recon: as soon as the official 2027 map drops, mark where the climb starts, its length and gradients. Build your pacing on that, not on race-day feel.