How to choose a bike: the five questions that actually decide it

The most expensive mistake in cycling is buying for the rider you intend to become. The bike bought for imagined 100 km Sundays spends its life doing 6 km commutes, and it is bad at them: the tyres are too thin for a kerb, there is nowhere to bolt a rack, and the riding position that makes sense at 30 km/h is punishing at 16.

So answer for the riding you did last month, not the riding you plan. If the plan comes true, a second bike is a nicer problem than a wrong first one. Every question below is about what you already do.

1. 1

   What is under the wheels?

   Tarmac only, or tarmac plus towpaths, gravel, forest doubletrack, rooted singletrack? This is the single strongest filter, because it sets the minimum tyre width, and tyre width sets the frame. Be honest about the worst surface you meet regularly, not the average one.

2. 2

   How long is the ride, and how often?

   Under 10 km a few times a week rewards a bike you can leave outside and ignore. Two hours every weekend rewards low weight and a comfortable position. Distance is what turns small fit and weight differences into things you actually feel.

3. 3

   What comes with you?

   Nothing, a laptop, a week of shopping, a child, camping kit? Luggage needs mounting points, and mounting points are designed in, not added later. A frame without rack and mudguard bosses will fight you for its whole life.

4. 4

   Where does it sleep?

   A hallway, a shed, a fourth-floor flat with no lift, a bike locker at work? Storage decides weight limits and whether a folding bike is the answer rather than a compromise. A 15 kg trekking bike up three flights of stairs stops being ridden by March.

5. 5

   What is the number you will not go past?

   Set it before you look, and set it including the kit you legally and practically need: lights, a lock, a pump, a helmet if you want one. That is rarely under €150 and can be €300 for a lock worth having in a city.

Those five answers are exactly what the finder asks for, in roughly that order, and it re-ranks all 53 bikes after each one so you can see which answer is doing the work.

Surface converts directly into millimetres of tyre, and tyre width is the number to shop on, because a frame can only fit what it can fit. Going wider adds grip, comfort and puncture resistance for a small speed penalty that is smaller than almost everyone believes.

This is why clearance is the first spec worth checking. Of the 53 bikes in this catalogue, 50 clear at least 35 mm and 33 clear 45 mm or more — the market has moved, and a new bike that cannot take a 35 mm tyre is making a deliberate racing choice you probably do not need.

Price does not buy speed in any direct way. It buys, in roughly this order: working brakes, a frame that fits tyres you need, gears that do not skip, less weight, and finally marginal stiffness and aerodynamics that only matter if you race. The catalogue here runs from €500 to €5,499 with a median of €1,899, and the interesting changes are all in the bottom half of that range.

If you take one thing from the table: the jump from €700 to €1,500 changes what the bike can do, and the jump from €2,500 to €5,000 changes how it feels. Only one of those is worth borrowing for. There is a longer version of this in what to spend on a bike .

Buying the frame size from a chart alone

Charts map height to frame size and ignore that two people the same height can have a 10 cm difference in inseam. The chart gets you to two candidate sizes; your leg length and your reach decide between them. Work out your size properly — it is fifteen minutes with a book and a tape measure, and it is the difference between a bike you ride and a bike you resent.

Paying for suspension you do not use

A cheap suspension fork is worse than no fork: it adds 2 kg, absorbs your pedalling, and needs servicing. Under about €900 a rigid bike with 45 mm tyres is more comfortable on everything short of an actual trail. Suspension earns its weight on roots and rocks, and nowhere else.

Forgetting the running costs

Budget a first service at 6–8 weeks — cables and spokes settle, and shops usually price it at €40–80 or include it. After that, chains are the consumable that matters: replace one at €25 before it wears the cassette, or replace both at €120 after. The maintenance basics cover the checks that prevent the expensive version.

A lap of the car park tells you nothing except that the wheels go round. If you can, ride for twenty minutes, and do these four things deliberately.

1. Brake hard, once, from a decent speed. You are checking whether one finger is enough and whether the lever comes back to the bar.
2. Shift to the hardest gear and the easiest under load on a hill. Skipping or hesitation on a new bike is a setup problem — it should be fixed before you pay, not after.
3. Take both hands off the bars for a second on a quiet straight. A bike that immediately veers is fighting you, usually a fit issue.
4. Ride over the worst surface you can find nearby. This is the one that tells you whether the tyres are wide enough for your real route.

If the shop will not let you ride it properly, that is information too. Direct-to-door brands trade the test ride for the price; several of them are excellent, but you are accepting that the fit is on you, which makes the sizing work above non-optional.