Keep a comfortably high cadence
Once you've settled into your pace, let your gearing help you stay there.
Most experienced climbers prefer a comfortably high cadence because it reduces the force needed with each pedal stroke and helps delay muscle fatigue on longer climbs. If you have sensitive knees, it's often more comfortable than pushing a harder gear at a low cadence. Rather than forcing a bigger gear, keep changing gear as the gradient changes so your cadence stays comfortable.
There's no perfect cadence that suits everyone. It depends on the rider, the climb and the gearing available. The important thing is to avoid grinding a gear that's harder than you can comfortably turn for the length of the climb.
If you'd like to understand cadence in more detail, our guide to finding your optimal cycling cadence explains how cadence changes with different terrain and riding goals.
Stay seated for most of the climb
Most climbing is done sitting in the saddle, and for good reason. It's generally the most efficient way to ride a long ascent and makes it easier to keep your effort consistent.
Standing has its place too. It can help you over a short, steeper section, give your muscles a brief change of position or help you accelerate away from a tight hairpin. Once the gradient eases again, sitting back down usually helps you settle into your rhythm.
There's no need to stand because you think you should. Use it when it helps, then return to the saddle when it doesn't.
Common climbing mistakes to avoid

Even experienced cyclists get caught out on climbs from time to time. The good news is that most climbing mistakes are easy to avoid once you know what to look for.
Starting too hard
It's tempting to make the most of fresh legs, but that's often what leads to struggling later. Start at an effort you know you can sustain and let the climb come to you.
Using gearing that's too hard
If you're forcing the pedals for long periods, you're probably making the climb harder than it needs to be. Choosing suitable gearing before your ride and changing gear as the gradient changes will help you maintain a comfortable cadence.
Waiting too long to eat or drink
Long climbs place a steady demand on your body. Eat and drink before you feel you need to, especially if the climb comes later in the ride.
Focusing on speed instead of effort
Your speed will change with every change in gradient. Heart rate, or simply paying attention to how hard you're breathing, is a much better guide to pacing than the number on your bike computer.
Practise before the real thing
Above: practise iconic climbs indoors on ROUVY before you travel.
Indoor training is a practical way to prepare for long climbs if you don't have mountains nearby.
Adding some strength training alongside your riding can help you stay stronger on longer climbs, especially when fatigue starts to build.
On a climb route, the resistance changes automatically to match the gradient of real roads. That lets you practise pacing by heart rate, experiment with different cadences and learn how longer climbs feel before riding them outdoors.
Longer Zone 2 rides are another excellent way to prepare for sustained climbing because they improve the aerobic endurance you'll rely on during long ascents. If you'd like to learn more, read our guide to Zone 2 training for cyclists.
If you've got a mountain trip planned, riding those climbs indoors beforehand helps you learn where the climb gets steeper and how to pace it from the start.