How to pace a hilly half distance triathlon – Challenge Kaiserwinkl-Walchsee race day tips

Got a tough middle distance race like Challenge Kaiserwinkl-Walchsee coming up? Get some tips for pacing well and managing your effort on a hilly bike course so you can race strong from start to finish.

Writer & Long Course Triathlete
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Challenge Kaiserwinkl-Walchsee this weekend will see age-groupers and PROs take to the hills of Austria’s Tirol region, ready to tackle 70.3 miles of swim-bike-run with a backdrop of incredible scenery. But while those rolling hills certainly deliver the goods on the scenic views front. They also mean the course is one of the toughest half distance triathlons going. And that can make knowing how to pace yourself during the bike leg on race day tricky.

Whether you’re racing in Walchsee this weekend and looking for a few last minute tips to help set your pacing strategy. Or you’ve got another middle distance / half Ironman triathlon coming up with a hilly bike course. We’ve got you covered with our top tips to help you pace well and race strong, all the way to the finish.

Dial in your effort – how to use power and heart rate on the bike

Managing your effort is key in any triathlon – go too hard at the start, and you’ll be paying for it later on. But doing so on perceived exertion alone can be hard to gauge. What feels “easy” during the first 20km of the bike, when the adrenaline is pumping and the fatigue is yet to kick in, can actually be too hard. And by the time you realise, the damage has already been done – particularly on a hilly course. This is where being able to use your data is really valuable.

Pacing the bike with power data

If you have access to a power metre and you’ve got a recent – and accurate – measure of your Functional Threshold Power, set yourself a target power range using a % of your FTP. For most age-groupers, around 80-85% of your FTP is the highest you want to push your average power for the entire ride.

info-circle what does ftp mean?

FTP stands for functional threshold power. Your FTP is the maximum amount of power (or force through the pedals) you can hold for one hour, and it’s often used as a measure of cycling fitness and a method to set efforts and intensity zones for training and racing. You can calculate your FTP by taking your best 20-minute power (from a hard effort such as a 10 mile time trial) and multiplying that value by 95%. Platforms such as Zwift and ROUVY also offered guided FTP tests.

On the climbs, try to avoid going over your FTP for more than a few seconds. Think of going into the red a bit like withdrawing from a bank account. Do it too many times, and that bank account will be empty right when you need it to have a few pennies left!

Challenge Kaiserwinkl-Walchsee 2023 - Photo Credit José Luis Hourcade / Challenge Walchsee 2023
Els Visser takes on a climb at Challenge Kaiserwinkl-Walchsee 2023 – Photo Credit José Luis Hourcade

Configure your bike computer so that it displays your normalised power and your 3-5 second power. The normalised data reading will give you a measure of your overall average effort throughout the ride, accounting for climbs and coasting down hills. And your 3-5 second power will help you to keep a lid on any huge spikes or surges as it’s a more ‘real-time’ measure of effort.

Using heart rate

If you don’t have a power metre, then heart rate is another metric you can use to ensure a sustainable effort on the bike that will leave you with enough energy left for the run.

As a general guide, most age-groupers want to work to a maximum of 85% of their max heart rate as an average to ensure they’re not overdoing it.


There are several different formulas that have been used over the years to calculate maximum heart rate. The most common being 220 minus your age. However this doesn’t have a high degree of accuracy, particularly for older and younger adults. Other formulas are slightly more accurate, such as Tanaka (208 – [0.7 x age]) and Gulati (206 – [0.88 x age], suggested as more accurate for females). But these still don’t take into account your individual variables such as genetics. If you’ve done an all out effort such as a 5km race recently, a good indicator of your personal maximum heart rate is looking at the peak heart rate you hit during that shorter max effort.

Even if you do have a power metre, it’s always good to use your heart rate in conjunction with your power data. Conditions on the day – such as heat and humidity – or even being slightly under the weather can all impact your capacity to perform. If you notice that your heart rate is far too high for the sustainable power output you should be able to hold on paper, that’s a sign to scale back the effort to ensure you don’t blow your entire race. Being a few minutes slower than expected on the bike could end up saving you significantly more time overall if you can run well out of T2.

Likewise, if you notice that both your heart rate and your perceived effort are lower than expected for your target power output. Maybe you’re having one of those golden days -and you can go a little harder if it feels good!

It’s all about using the data in tandem with how you feel, to make smart pacing decisions that will set you up for success.

Watch your cadence – be wary of the grind

We recently caught up with 3-time Challenge Kaiserwinkl-Walchsee winner Frederic Funk to get his tips for taking on this challenging middle distance tri. And amongst his advice, he suggested “don’t grind over every single climb, or you are going to pay for it.”

Tackling every climb in a big gear with a slow cadence can put unnecessary load and fatigue through your legs – something you’ll regret by the time you get to the run course. Keeping an eye on your target power and HR numbers, it’s worth considering spinning at a higher cadence on the climbs to get to the top efficiently, without wearing out your legs any more than necessary.

Keep it smooth – ride your own race

Particularly during the first half of the bike course at a hilly half Ironman distance triathlon, it can be tempting to get swept up in the excitement and go blasting up the climbs – only to lose all the time you just gained because you need to slow down significantly afterwards to recover once you’ve reached the top. If you can hold steady and stick to your targets, you’ll probably find that you end up re-overtaking people who’ve just powered past you on the uphill. Hold your nerve and trust your pacing plan. Don’t get swept up in a game of cat and mouse – ride your own race.

As well as using your 3-5 second power (or heart rate) to avoid going too hard up the climbs. You can also use your normalised power to gauge how much recovery you can take on the downhills and the flats. If the normalised power starts dropping below your targets, you know you need to maintain the pace more on the flats. And if you’re over your target, you know you need to cool it on the up hills.

Challenge Kaiserwinkl-Walchsee 2023 - Photo Credit José Luis Hourcade / Challenge Walchsee 2023
Fred Funk on his way to a third consecutive win at Challenge Kaiserwinkl-Walchsee in 2023 [Photo Credit José Luis Hourcade]

“It’s a hilly course, with 4 laps around the lake,” Fred Funk says. “Make sure you have enough energy left after the bike.” Avoiding big spikes and surges, keeping it smooth and riding your own race on the bike will put you in a good place for the run once it’s time to head out of T2.

Stay focused on the downhills

On a hilly course, we’ll often think most about the up hill sections. But it’s also important to stay focused on the descents. The obvious reason being that a loss of concentration on any technical downhill sections could end in disaster. But also because it’s easy to lose more time than necessary if you’re not focused on the descent.

Use the downhills to recover from the effort of the ascent. But also focus on taking an efficient line and maintaining as much momentum as possible.

Don’t forget to fuel and hydrate properly

Finally, with all that focus on data, perceived effort and not taking a tumble on the downhills. It can be easier than you might think to forget to take on enough fuel and hydrate properly during a hilly race. Factor in that you might be on the bike for longer than you typically would on a flatter course. And the overall intensity might be higher with all the climbing. So you might need to take more fuel than usual.

Depending on the weather conditions, you may also sweat more on a hilly course – not only because you’re having to work hard up the climbs. But also because you’re not getting as much of a cooling effect from the wind speed as you would on a course with a flatter profile. Keeping your electrolytes topped up as well as your carb intake is key to avoiding cramp and dehydration.

Read our article with Fred Funk for more race day tips for Challenge Kaiserwinkl-Walchsee. And if you’re feeling fired up and ready to take on another hard race, check out our round up of the toughest middle distance triathlons.

Jenny Lucas-Hill
Written by
Jenny Lucas-Hill
Jenny Lucas-Hill is a writer, content creator and communications professional. A long-distance triathlon enthusiast, she has four full Iron-distance finishes to date & also loves watching the sport.
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