You can spend €2,000 on a wheelset and save maybe 10 watts at 40km/h. Or you can spend €250 on a bike fit and find more than that — on every ride, in every position, for the next five years. The cycling internet will tell you the next upgrade is the answer. It almost never is. The answer is usually already under you, set wrong.
I've had this conversation more times than I can count. When I went to Manchester to get fitted by Phil Burt — the man who fitted Chris Froome, Bradley Wiggins, Geraint Thomas and Victoria Pendleton through the British Cycling and Team Sky years — the first thing he did wasn't measure anything. He watched me pedal. When Dr Andy Pruitt, the fitter behind the Specialized Body Geometry system and four decades of work with US Olympic and World Tour riders, came on the podcast to simplify bike fit, he said the same thing in different words: the bike has to fit the body, not the other way around.
This is the guide I wish I'd had when I started. No fluff, real measurements, and the bits the generic sites get wrong.
Why bike fit matters more than any component
Here's the thing nobody tells you when you're new to this. Your fitness — your aerobic system, your watts — is built through training. But your ability to deliver those watts to the road is decided by how you sit on the bike. A great fit doesn't add power to your legs. It stops you leaking the power you already have, and it lets you hold a strong position for four hours instead of fading after ninety minutes.
Think about the three contact points: your hands on the bars, your feet on the pedals, your sit bones on the saddle. Every watt you produce and every bit of road buzz you absorb passes through those three places. Get any one of them wrong and the cost compounds — thousands of pedal strokes, every ride, slightly off. A poor fit is also the single most common cause of cycling knee pain, back pain and the kind of numbness that ends rides early.
A component upgrade is a one-time, marginal gain. A fit is a permanent, structural one. That's the maths.
The three contact points
Everything in fitting comes back to those three points, and they interact. Move your saddle and your reach to the bars changes. Move your cleats and your effective leg length changes. This is why chasing one number in isolation never works. Take them in the order that matters: saddle first, because it sets almost everything else, then the front end, then the feet.
Saddle height — methods and which to trust
Saddle height is the master variable. Get it right and the rest falls into place. Get it wrong and you'll fight the bike forever. There are three classic methods, and they're worth knowing because they each get you into the right neighbourhood.
The LeMond method. Greg LeMond popularised this one: measure your inseam (barefoot, book pulled firmly up to the crotch, floor to top of book), multiply by 0.883, and set that as the distance from the centre of the bottom bracket to the top of the saddle. It's a solid opening estimate and takes thirty seconds.
The Hamley method (109% inseam). From the original 1967 Hamley and Thomas research: saddle height measured from the pedal axle to the top of the saddle (with the crank in line with the seat tube) should be about 109% of your inseam. It's measuring almost the same thing as LeMond from a different reference point, and it'll land within a few millimetres.
The dynamic knee-angle method. This is the one to actually trust. You set the saddle so your knee bends 25–35° at the bottom of the pedal stroke — measured while you pedal, on video or with a goniometer, not standing still. Road riders generally want to be toward the 30° end; this is the modern standard every serious fitter uses, because it accounts for your anatomy, your foot, your flexibility, rather than assuming everyone's leg works like a formula.
Use LeMond or Hamley to get close, then verify with the knee angle and footage. And remember the rule Phil Burt and Pruitt both hammer: too high is worse than too low. A saddle that's too high makes your hips rock side to side to reach the bottom of the stroke, which trashes your lower back, strains the back of the knee, and ironically costs you power — research suggests a badly set saddle height can cost up to 8% of your output. If you film yourself from behind on the trainer and see the hips rocking, drop the saddle 5mm and ride a week. Most amateurs end up faster slightly under the "leg almost straight" guideline, not above it.
Saddle fore-aft and the KOPS debate
Once height is set, fore-aft decides where your knee sits over the pedal — and this is where the internet gets stuck in 1975.
KOPS — Knee Over Pedal Spindle — says: turn the cranks horizontal, drop a plumb line from the front of your kneecap, and it should fall through the pedal axle. It's a fine starting reference. It is not a law of physics, and modern fitting has moved past treating it like one. Your ideal fore-aft depends on your femur length, your hip mechanics, how much you ride in the drops, and whether you're a time-trialist or a climber. Some riders sit slightly behind KOPS for more posterior-chain power; some triathletes sit well forward to open the hip for an aero position.
The practical takeaway: use KOPS to get in the ballpark, then let comfort and power tell you the rest. Front-of-knee pain often means you're too far forward (or too low); back-of-knee pain often means too far back (or too high). The knee is an honest reporter.
Handlebar reach, drop and width
The front end is where comfort and aerodynamics fight it out, and where most amateurs over-reach for a pro look they can't hold.
Reach is how far forward you stretch to the bars (set by frame size and stem length). Drop is how far below the saddle the bars sit. Together they decide your back angle and how much weight goes through your hands. Too much reach or drop and you'll get neck ache, lower-back lock-up, numb hands, and — the bit people miss — worse aerodynamics, because you can't actually hold the position so you sit up. A position you can hold for the whole ride is always faster than an aggressive one you abandon after an hour.
Width is the underrated one. The old advice was to match bar width to your shoulders (measured bony point to bony point at the front of the shoulders — the acromion). That's still the comfort baseline: too wide and you over-open the chest and add frontal area; too narrow and you compromise control and breathing. The current pro trend is toward narrower bars for aerodynamics, but pros have the core strength and bike handling to manage it. For most amateurs, shoulder-width (typically 38–42cm) is the right call. Get the position you can breathe and steer in first; chase aero second.
Cleat position and float — the most underrated variable
If saddle height is the master variable, cleats are the most ignored one — and the change I tell almost everyone to make first. I've written a whole piece on the single cleat fix, because it's that common.
Most amateurs run their cleats too far forward, so the ball of the foot sits in front of the pedal axle. That loads the calf, leaves the glutes and hamstrings half-asleep, and gives you premature calf fatigue, hot foot, and numb toes by the third hour. The fix: move the cleats back so the ball of your foot sits over or slightly behind the axle — a shift of 5–10mm, five minutes with a hex key. There's a growing case for going further toward true mid-foot cleat position, especially for long-distance and ultra riders.
Then there's float — the few degrees of rotation the cleat allows before it releases. Run 4.5–6° of float unless you have a specific reason to lock the foot down. Zero float forces your knee to track a path your hips and ankles might not agree with, and that's a fast route to knee pain. Set the rotational angle to match how your foot naturally points when you stand. And know when the cleats themselves are simply worn out and need replacing — a worn cleat changes your fit without you noticing.
Crank length — why 172.5 isn't right for everyone
Walk into a shop and most bikes ship with 172.5mm cranks, almost regardless of whether you're 5'5" or 6'3". That's a manufacturing convenience, not a fit decision.
Shorter cranks have quietly become one of the biggest shifts in fitting. A shorter crank (165mm for many riders, 160mm for shorter ones — Pogačar famously runs very short cranks in time trials) means your hip and knee don't close as far at the top of the pedal stroke. That opens the hip angle, which does three useful things: it eases hip and lower-back discomfort, it lets you get lower and more aero at the front without crunching your gut, and it makes high cadence feel smoother. The fear is always "won't I lose leverage and power?" For the vast majority of amateurs, the research and the fitting-floor evidence say no — you can't measure the power difference, but you can feel the comfort one.
If you have any hip or lower-back niggle, or you're trying to get lower on the bike and can't breathe down there, a shorter crank is one of the most underrated changes available. It's not free — you're buying a crankset — but it's transformative for the right rider.
DIY bike fit vs professional fit — when to pay
You can do a lot yourself. The cleat shift, the saddle-height knee angle, filming yourself from behind on the trainer — all DIY, all free, all worth doing this week. For a rider with no pain who just wants a sane baseline, a careful DIY session gets you most of the way.
Pay for a professional fit when any of these are true: you ride more than five hours a week, you have any persistent discomfort or numbness, you're coming back to the bike after a long layoff, you've bought a new bike, or you've simply never had one. Expect to pay €150–€350 (or $150–$350) — a static fit at the lower end, full motion-capture at the higher. The right fitter is the one who asks about your goals, your injury history and your flexibility before touching a single bolt, the way Phil Burt watched me ride before he measured anything. A fitter who treats a 50-year-old sportive rider the same as a 25-year-old racer is the wrong fitter.
How bike fit changes as you age
This is the part the generic sites skip entirely, and it's central to how the Roadman audience thinks about the sport. Your fit is not a one-time setup — it tracks your body.
Flexibility drops with age. The aggressive low-and-long position you held comfortably at 30 can wreck your back at 50. Old injuries change how your hips and knees want to move. As an older rider, the trade-off quietly shifts from raw aero toward sustainable comfort — and that's not a concession, it's smart, because comfort is what lets you keep training consistently and stay Not Done Yet. Raising the bars 10mm, fitting a shorter crank, or moving toward mid-foot cleats are all age-appropriate moves that keep you riding strong for another decade. A solid stretching routine protects the flexibility your position depends on. Re-fit every couple of years, or after any significant injury or body-composition change.
Signs your bike fit is wrong
These are mechanical symptoms with mechanical fixes. Match the symptom to the contact point:
- Numb hands → too much weight on the bars; reach too long or drop too big.
- Numb feet / hot foot → cleats too far forward, or shoes too tight.
- Saddle-area numbness or saddle sores → saddle too high, tilted wrong, or the wrong saddle for your sit-bone width.
- Front-of-knee pain → saddle too low or too far forward.
- Back-of-knee pain → saddle too high or too far back.
- Neck and lower-back ache → reach/drop too aggressive, or core not yet ready for the position.
- Power that fades on long rides → you can't hold the position, so you're not actually in it.
If you're getting dropped on climbs or nervous descending, fit is often hiding underneath both — a closed hip angle or a saddle too far back changes how you climb and how confident you feel in the drops.
The aero vs comfort spectrum — where amateurs should sit
Every fit lives on a line between maximum aero and maximum comfort, and the industry sells you the aero end. Here's the honest version: for the vast majority of amateurs, the fastest position is the most sustainable one. We dig into this properly in aero vs weight for cyclists, but the principle is simple — drag you can't hold isn't an advantage. If your "fast" position means you sit up on every climb and bail to the tops after an hour, your average position is slower than a slightly higher setup you stay in all day.
Pros sit at the extreme aero end because they have the flexibility, the core, and a team of fitters keeping them there. You're not being timed over 200km in a peloton. Sit two-thirds of the way toward comfort, earn your way lower with mobility and core work over months, and let aero be a reward for the position your body can actually hold — not an ambition that hurts you.
What to do this week
Three steps, in order, no shop required:
- Check the ball of your foot over the pedal axle. If it's over or in front of the axle, move the cleat back 5–10mm and ride a week.
- Film yourself pedalling from behind on the trainer. If your hips rock, drop the saddle 5mm. Then check the knee angle from the side — aim for that 25–35° bend.
- Note what changes — calf fatigue, knee comfort, breathing on climbs. The feedback is fast, usually within two or three rides.
If you do all three and still have nagging issues, that's exactly when a professional fit earns its money.
Bike fit isn't a one-off job you finish — it's what the rest of your riding sits on, and it moves as your body and training do. If you want to stop guessing and get fit, fuelling, training and strength working together around your actual week, that's what we do inside Not Done Yet at Roadman — a community of serious amateurs who refuse to accept their best days are behind them. Come and find the watts you've already got.
Got a specific question — your own saddle height, fore-aft, what to ask a fitter before you book? Ask the Roadman community on Skool and get an answer drawn straight from the bike-fit conversations on the podcast.