When a rider tells us their hands feel overloaded, one of our first questions is “when does this happen?”
Ten minutes into a club run tells us something different from the last descent of a long ride through Devon. That detail gives us a starting point for looking at how the saddle, pedals and bars work together.
A bike fit looks at how you sit, pedal and reach the controls, then uses that information to guide changes to your position. It can help you work out why you keep shifting on the saddle, why the drops feel too far away or what to look for in the size and set-up of your next bike.
For a performance bike, fit is not an optional finishing touch. It influences comfort, efficiency, handling and the confidence to use the bike as intended. That applies whether your target is a fast ten-mile time trial, a gravel event, a weekly chain gang or long days riding through Devon lanes.
What is a bike fit?
A bike fit is a considered assessment of how you sit, pedal, steer and move on a bicycle. It uses your proportions, flexibility, mobility, injury history, riding experience and goals to establish a position that is sustainable and effective for you.
It is not simply measuring your inside leg and setting saddle height. That can provide a useful starting point, but a proper fit considers the relationship between several contact points: saddle, pedals and handlebars. Change one, and the others may need to change with it.
A fitter will usually look at how far and how easily you can reach the bars, your saddle height and fore-aft position, the angle and width of the cockpit, cleat position, and how your hips, knees, ankles, shoulders and hands behave while pedalling. They may also assess your current bike, riding shoes and saddle, because each is part of the system.
The aim is not to force every rider into one textbook position. A supple racer preparing for short, hard events may be able to ride lower and longer than a rider who spends six hours at a time on mixed roads. Neither position is automatically better. The right position is one that supports the riding you actually want to do.
Bike fits explained: comfort is not a compromise
Some riders worry that a comfortable position must be slower. In practice, discomfort often costs more speed than a slightly less aggressive silhouette. If your hands are numb, your lower back is tightening or your hips are rocking to reach the pedals, you will move around on the bike, struggle to hold your preferred position and waste attention that should be on the road or effort.
A good fit helps you create power consistently and control the bike calmly. It should allow you to breathe freely, settle your weight through the saddle and pedals rather than loading the hands, and steer without tension through the shoulders. On rougher roads or gravel, it can also make the difference between feeling connected to the bike and feeling as though you are merely hanging on.
There are trade-offs. A more aerodynamic road or time-trial position can be quicker if you can maintain it with stable hips, clear breathing and repeatable power. If you cannot, its theoretical advantage may disappear. Likewise, an endurance-oriented position should not be so upright that it makes the front of the bike vague or leaves too much weight on the rear wheel. Fit is about balance, not just comfort or speed in isolation.
What happens during a professional bike fit?
The detail varies between fitters, but a worthwhile session begins with a conversation. Your fitter should ask what you ride, where you ride, what you enjoy, how long your usual and longest rides are, and whether you have recurring pain or previous injuries. A rider training for local criteriums needs a different emphasis from someone planning multi-day rides, even when both own road bikes.
They may then assess movement off the bike. This is not a pass-or-fail flexibility test. It simply gives context. Limited hip mobility, a previous shoulder injury or asymmetry between left and right sides may affect what is realistic and comfortable.
On the bike, observation matters. Video, motion-capture systems and pressure mapping can be useful tools, but they are not the fit itself. They can show patterns that are difficult to see with the eye, yet numbers still need interpreting by someone who understands the rider in front of them. A position that sits within a recommended range may still feel poor for an individual.
Adjustments are normally made one at a time, with time to pedal and respond. Saddle height may change by only a few millimetres. Cleats may move slightly rearward, inward or outward to better support the foot and knee. A shorter stem, different handlebar shape, reduced reach, altered crank length or a different saddle can have a more meaningful effect than a dramatic change to frame size.
The session should finish with clear recommendations. Some can be made immediately. Others may need parts, a period of adaptation or a follow-up review. A fit is not a single frozen set of coordinates. Fitness, flexibility, injury status, riding goals and even the type of events you enter can change over time.
Should you get a bike fit?
If you have persistent discomfort, recurring niggles or feel unable to settle on the bike, a fit is a sensible place to start. Pain is not always caused by position, and a good fitter should recognise when a physio, doctor or other specialist is the better next step. But bike position can contribute to issues that riders often accept as normal, including hand numbness, saddle discomfort, knee pain and neck or lower-back tension.
A fit is also valuable before buying a new bike, particularly a premium bike or a bike with an ambitious geometry. This is the point at which it can prevent expensive compromises. Rather than choosing a frame because it is the right colour, the newest model or the apparent bargain, you can establish the frame size, stack, reach and cockpit range that are likely to work for you.
That does not mean every rider needs an elaborate fitting process before buying their first bike. If you are beginning to ride, a sound basic set-up and sensible frame choice may be enough initially. But the more time, money or ambition you are putting into cycling, the stronger the case becomes for making fit part of the decision.
If you’re moving from a stock bike to a custom build, tell David what you’d keep about your current position and what you’d change. You might like where the brake hoods sit but rarely use the drops because they feel too far away. That gives us something concrete to work with when choosing the bar shape and stem length, before David hand assembles your individually specified bike in Axminster.
A fit cannot solve every problem
A bike fit has limits, and it is useful to be honest about them. It cannot replace basic conditioning. If your core, upper body or mobility is not used to long rides, even a well-chosen position may initially feel demanding. Nor can it make unsuitable clothing, poor-quality shorts or an old saddle with damaged rails comfortable.
It also cannot make one bike perfect for every discipline. A road bike set up for fast group riding can cover plenty of distance, but it will not offer the same stability or tyre volume as a dedicated gravel bike. A time-trial machine prioritises a very particular riding position and may be less pleasant for a relaxed café ride. The best result begins with choosing the right type of bike for the job.
Be wary of a fit that chases an extreme position without understanding your experience and aims. Equally, do not assume that the answer to discomfort is always a shorter stem or a higher bar. Those changes can help, but they may merely mask a saddle, cleat or frame-sizing issue.
How to get the most from your fit
Arrive with the kit you actually use: cycling shoes, pedals if they are not already fitted, shorts and, ideally, your usual riding jersey. Be open about discomfort, but describe when it happens. Pain after ten minutes is different from pain after four hours or only when climbing hard.
Afterwards, give sensible changes time. A new position may use muscles differently, and a small adaptation period is normal. Sharp pain, worsening numbness or a new problem is not something to push through. Make a note of what you feel, on what terrain and at what point in the ride, then feed that back into any review.
The best fit is not the one with the most impressive-looking angles on a screen. It is the one that lets you ride with less distraction, more control and greater confidence in what your bike can do. When the bike feels like an extension of your effort rather than an obstacle to it, you are much closer to a position built around you.
Find a Position You Can Ride in All Day
Think about the point in a ride when you start moving around on the saddle or changing your grip to get comfortable. Bring that detail to your conversation with us in Axminster. It helps us understand what you need from your current bike or what to build into your next Redchilli.
Redchilli Bikes. Your Bike. Your Way.