Why Your Bike Fit Changes Every Winter

Rather than guessing, measure your actual position with your own camera.

€5 for one fit, or 10 fits for €25. See pricing →

Nothing moved, but everything changed

A bike stores its settings mechanically. Unless you touched the seatpost, your saddle is exactly where you left it.

Your body has no such memory. Across a winter off, or a winter of shorter and easier rides, several things shift at once:

• Hamstring and hip flexibility drops. This is the big one. Less flexibility means your pelvis rotates backwards sooner when you lean forward, so the same reach now rounds your lower back.
• Core endurance falls faster than leg strength. You may still push the same watts for ten minutes, but your torso collapses onto your hands after an hour in a way it did not last season.
• Body weight and composition change for most people over a winter, which alters how you sit on the saddle.
• The bike changed too, quietly. New shoes with a different sole thickness. A replaced saddle that sits 3 mm higher on its rails. A worn chamois that no longer sits the same. Cleats that have worn and shifted a degree or two.

Each of these is small. Together they are enough to turn a comfortable position into one that hurts by March.

The complaints that show up in spring

Recognise any of these and the cause is usually seasonal drift rather than a new problem:

• Lower back pain that was not there last year. Flexibility loss, almost always.
• Numb hands after an hour. Core endurance loss shifting weight onto the arms.
• Saddle discomfort on the same saddle that was fine. Weight change, a new chamois, or a saddle that was replaced and not set back to the same height.
• Knee niggle in the first hard rides. Usually load rather than position, but worth ruling the position out.

The cheapest fix: check before the season, not after the pain

Ten minutes in early spring saves weeks of discomfort:

1. Measure your saddle height from the centre of the bottom bracket to the top of the saddle, and compare it to what you wrote down last year. If you did not write it down, do it this time. 2. Check the saddle is level, saddles slip on their rails over a season, usually nose-down. 3. Check cleat wear. Worn cleats change your foot angle without you noticing, which is a common cause of one-sided knee pain in early season. 4. Raise the bars a little for the first weeks if you have been off the bike. You can always lower them again as flexibility returns; the reverse, riding a position you cannot hold, is what raises the risk of injury. 5. Note whether anything on the bike was replaced. New shoes, new saddle, new pedals all move your effective position even when the seatpost never moved.

Do not assume last year's numbers are the target

This is the mistake that follows. Riders re-measure, find the saddle drifted 4 mm, put it back to last season's number, and are surprised that it still hurts.

Last season's number suited last season's body. If you have lost flexibility, the correct position right now is slightly more forgiving than the one you finished on. Work back toward it over six to eight weeks rather than starting there.

Riding through winter changes things too

Even if you rode all winter, indoor training changes what your body is used to. A winter of trainer sessions builds a position habit with no coasting, no standing and no bumps. Riders often find their outdoor position feels unfamiliar in spring for exactly that reason, and that their saddle contact points are more sensitive than they remember.

Measuring the drift

The value of measuring twice is the comparison, not the single number. Measure now, keep the report, and measure again after six to eight weeks when flexibility has returned. If your hip angle has opened and your torso lean is comfortable again, you can move back toward your old position with evidence rather than hope.

A BikeFit/LAB analysis reports your knee extension, hip angle, torso lean, elbow angle and saddle fore/aft, and reports are stored in your account, so the spring measurement and the summer one sit side by side instead of relying on memory.

Rather than guessing, measure your actual position with your own camera.

€5 for one fit, or 10 fits for €25. See pricing →