Struggling with discomfort, knee pain, or just don't feel you're getting the power out? Here's how to adjust your saddle height for perfect pedalling

Setting your saddle height correctly is crucial to comfort, injury prevention and performance – it’s the very foundation of good bike fit.

It’s not uncommon to see riders getting this adjustment wrong, the warning sign of which is often knee pain. The good news is that with the right guidance it’s fairly easy to get it right at home.

Why saddle height matters

We spoke to former pro rider Jimmy George – whose new career is in bike fitting and coaching at V02 Cycling, based in the leafy cycling mecca that is Hildenborough, Kent.

“When I do bike fits, [after the cleats] it all starts with saddle height. Then fore and aft. Everything else – handlebar height and reach – comes after,” he says.

“Getting your saddle height is important because you need to be comfortable when you ride, this will enable you to ride longer and to push harder. Getting the height right will also prevent injury – compression injuries from having it too low and over-stretching issues from having it too high. Really, cycling shouldn’t result in any injuries, unless you fall off the bike.”

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saddle height

Saddle height is the distance between middle of the bottom bracket and centre of the saddle

The saddle height measurement, to be clear, is the distance between the centre of the bottom bracket and the centre of the saddle.

How to set saddle height at home

So how do you get it right? There are many methods, formulas and magical calculations – but George recommends the old favourite.

“The basic one, and the easiest and most accurate method to use at home, is to sit on the bike [on a turbo trainer]. Unclip, and put your heel in the middle of the pedal axle. Run the pedal down to the furthest point – so the crank is in line with the seat tube.

“In this position, your leg should be fully extended without any drop in the hip. It’s common for people to be able to reach the pedal, but their hip drops [this means the saddle is too high]. The hips must be neutral – but the hamstring will be stretched as will the calf.

“By the time you clip back in, the angle of your foot should create the right angle at the knee.”

This is the gold standard method. But it’s important not to stop there.

Jimmy George at V02 cycling at work. Image: V02 Cycling

Jimmy George at V02 cycling at work. Image: V02 Cycling

“The other thing to check is the layback,” George advises; “with a friend, drop a plumb line from the knee. The back of the knee cap should be in line with the ball of the foot. The ball of the foot should be over the axle of the pedal.

“This done, you should repeat the saddle height check – moving the saddle forward will have shortened the angle, and vice versa.”

After this, George suggests riding the bike and a process of trial and error “if it feels too low, move your saddle 1mm up, if it still feels low, 1mm up again and vice versa. If you go too high, you’ll notice you rock on the saddle or feel a strain at the back of the knee. Pedalling will cease to be smooth and circular, and you may feel your snatching at the bottom of the stroke. If you go too low, you’ll feel compression at the front of the knee.”

To recap:

  • Sit on the bike, set up on a turbo trainer
  • Drop the pedal to its lowest point, in line with the seat tube
  • Unclip, and place your heel on the pedal axle
  • Your leg should be completely straight
  • When you clip in, this will give you your start point
  • Check fore and aft – you should have a straight line from the knee cap to the ball of the foot, which should sit over the pedal axle
  • If you make adjustments to fore and aft, repeat the saddle height test
  • Feel free to fine tune, but make any changes in increments of 1mm

Is there another way?

If you prefer mathematics and formulas, there is another method that is based on inseam measurement.

To find the initial number, stand with your feet hip width apart (shoes off), place a spirit level between your legs, and mark a point on the wall where the top of the spirit level sits. Note down the distance from floor to the dot. Then multiply this by 0.9 to give you 90%.

saddle height

Measure your inseam using a spirit level then apply to your saddle height

George, who owns V02 cycling where they build custom bikes for customers based on their numbers, says: “We use this as a ball park measurement, when we’ve never met someone and are building their bike. I would say it gives the right figure 50% of the time. When we put the rider on the bike, we’re likely to make adjustments.”

This is because the theory only delves so far as basic mathematics – and bodies are not formulaic.

The bike fitter explains: “People have different muscle tensions. So to a very mobile person, the resulting saddle height might feel too low. To someone with tight muscles, it might feel too high.

“The heel on pedal method takes that into account as a mobile person will have the leg totally straight whilst a tight person may have a slight bend and feel like its full extension, without being aware of any bend. It’s not a formula and takes individual differences into account.”

Still cant get it right?

The heel on pedal method, then, seems to be the best option for those looking to ride a road bike in comfort.

However, there are more factors involved in ideal bike fit. There comes a certain point when you need a professional bike fitter to scrutinise.

“If you just can’t get comfy it is worth getting a bike fit. There’s so many factors involved, saddle tilt, fore aft, cleat adjustment.”

It’s also worth repeating the process for every bike, “some guys will say they use same measurement,” George says.

“But saddles vary – some have a slight dip. The pelvic pitch forward and position of the lower back might change between bikes.”

When it comes to time trial bikes, an area where the road racer turned triathlete hones his expertise, he’d always suggest booking in with a pro.

Matt Bottrill advises on time trial bike fit. Image: Chris Catchpole

Matt Bottrill advises on time trial bike fit. Image: Chris Catchpole

“The fore and aft is really different – particularly with modern [time trial] positions getting very far forward and low as you can. You’re asking your pelvis to be completely rotated.

“It’s a completely different topic and I would say there isn’t a formula. We need to make sure the rider can sustain the position and generate power there, you can only really tell that with a [professional] bike fit.”