Buying a Bike for Your Child: Sizing and What to Look For

We are asked about children's bikes often enough that this guide is worth writing, and we should start with the honest part: we do not stock kids bikes. Our range begins at adult sizes. What we can do is tell you how to choose one properly, which is where most of the money gets wasted, and help with everything around it once you have one.

Contents

1. Wheel size, not age
2. The standover check
3. Weight matters more than anything else
4. Brakes small hands can reach
5. What to avoid
6. How much growing room
7. The helmet
8. What we can help with
9. Frequently asked questions

Wheel size, not age

Adult bikes are sized by frame. Children's bikes are sized by wheel diameter, and the right one depends on your child's height rather than their age. Children of the same age vary enormously in height, and buying by the age on the box is the most common sizing mistake.

Wheel size	Child height	Rough age
12 inch	85 to 100 cm	2 to 4
14 inch	95 to 110 cm	3 to 5
16 inch	105 to 120 cm	4 to 6
20 inch	115 to 135 cm	5 to 8
24 inch	130 to 150 cm	7 to 11
26 inch	145 to 160 cm	10 to 13
700c, adult small	155 cm and above	12 and above

Measure your child against a wall in the morning, and use the height rather than the age every time. Where a child sits between two sizes, see the growing room section below.

The standover check

The single most useful in-person test, and it takes ten seconds.

Have your child stand over the top tube with both feet flat on the ground. There should be a gap of 3 to 5 centimetres between the top tube and their body, or a little more for off-road riding.

Then check the saddle. With the saddle at its lowest, a child who is still gaining confidence should be able to put both feet flat on the ground while seated. Once they are riding confidently, raise the saddle so the leg is nearly straight at the bottom of the pedal stroke, with the balls of both feet touching the ground when seated.

A child who cannot get a foot down quickly will not trust the bike, and a child who does not trust the bike does not ride it.

Weight matters more than anything else

This is the thing almost nobody checks and it is the biggest single difference between a bike a child rides and one that sits in a corner.

Many children's bikes sold in India weigh 11 to 13 kg. A typical six year old weighs around 20 kg. That is a bike weighing over half the rider.

Put that in adult terms. A 70 kg adult riding the equivalent would be on a 38 kg bicycle. Nobody would call that fun, and no amount of enthusiasm compensates for it.

Aim for a bike under 40 percent of your child's body weight, and under 30 percent if you can manage it. Lighter bikes cost more, and this is the one area where the extra money genuinely changes whether the bike gets used. Pick the bike up in the shop before buying it.

Brakes small hands can reach

A brake lever designed for an adult hand is unusable by a seven year old, and this is a safety issue rather than a comfort one.

Check two things with your child holding the bars:

• Can they reach the lever with their fingers wrapped around it, without shifting their grip?
• Can they pull it hard enough to lock the wheel? Have them try while you hold the bike.

Look for reach-adjustable levers, usually a small screw on the lever body that brings it closer to the bar. Most decent children's bikes have them and most cheap ones do not. If the levers do not adjust and your child cannot reach them, that bike is not safe for them yet regardless of how well it fits otherwise.

What to avoid

• Suspension forks on small bikes. A suspension fork on a 20 inch bike adds one to two kilograms and does almost nothing, because these units need adult body weight to compress. It is styling that makes the bike harder to ride.
• Too many gears. A single speed or a simple twist shifter is easier for a child to manage than 21 gears they will never use, and there is far less to go wrong.
• Buying two sizes up. The most expensive mistake, covered below.
• Heavy steel frames where an aluminium option exists at a sensible price.
• Training wheels as a first step, for most children. See the FAQ.

How much growing room

Every parent is tempted to buy a size up, and it is understandable given how quickly children grow and what bikes cost.

Resist it beyond one size. A bike that is too big is genuinely harder to control: the child cannot get a foot down, cannot reach the brakes properly, and is stretched over the bars. That is how confidence gets lost, and a child who has a frightening experience early can take a long time to come back to riding.

The sensible approach is to buy the size that fits now with the saddle low, and use the saddle height and seatpost as your growing room. Most children's bikes have enough seatpost travel to cover a year or more of growth. When the seatpost reaches its minimum insertion mark, that is the signal to move up a size, not before.

The helmet

Non-negotiable, and it needs to fit properly to do anything useful.

Helmets are sized by head circumference, measured about 2.5cm above the eyebrows. Small children need a child-specific helmet, which we do not stock. From roughly 48cm head circumference upward, which typically means older children and teenagers, the adult small sizes in our helmet range begin to fit, and Safety Labs starts at 48cm which is the smallest we carry.

Whatever you buy and wherever you buy it, the fit checks matter more than the brand. Our helmet sizing guide covers measuring and the five checks that tell you a helmet actually fits. Bring the helmet and the child to our store and we will check it for free.

One rule specific to children: never buy a helmet with room to grow. A loose helmet rotates on impact and protects nothing.

What we can help with

We do not sell children's bikes, and we are not going to pretend otherwise. Here is what we can do.

• Service and safety check any child's bike, wherever it came from. Bikes at this end of the market often arrive badly assembled, with loose headsets, poorly adjusted brakes and incorrect bearing preload. A proper check is worth having before your child rides it, and our workshop will do it.
• Tubes in the sizes nobody stocks. We carry 16 inch and 24 inch tubes, which are surprisingly hard to find when you need one on a Sunday.
• Helmet fitting, free, on any helmet.
• Kit for older children, including a kids jersey and kids sunglasses, which matter more in Indian sun than most people think.
• Honest advice on a bike you are considering. Send us the model and we will tell you what we think, including when we think you should not buy it.

Frequently asked questions

How much room to grow should I allow?

One size at most, and use the saddle height rather than the frame as your adjustment. A bike bought two sizes large cannot be made to fit by lowering the saddle, because the reach to the bars and the brake levers stays wrong and the child cannot get a foot down quickly. Most children's bikes have enough seatpost travel for a year or more of growth, so buy what fits now with the saddle low and raise it as they grow. Move up when the seatpost reaches its minimum insertion mark.

Is a heavy bike really that much of a problem?

Yes, and it is the most underrated factor in whether a child enjoys cycling. A bike weighing half of the rider is exhausting to accelerate, hard to lift over a kerb and difficult to control at low speed, which is exactly where a learning rider spends their time. Children rarely articulate this; they simply stop asking to ride. If your budget forces a choice between a lighter simple bike and a heavier one with more features, take the lighter one every time.

Should my child start with training wheels or a balance bike?

A balance bike, for most children, and the difference is significant. Training wheels teach pedalling while preventing the child from learning balance, which is the actually difficult skill, and the transition off them is often distressing. A balance bike teaches balance and steering first, and children who learn this way frequently move to a pedal bike without any intermediate stage. If your child is already on training wheels and struggling, removing the pedals from their bike and lowering the saddle turns it into a balance bike.

Do children need a proper cycling helmet, and what size?

Yes, and it should be sized by head circumference rather than age, measured about 2.5cm above the eyebrows. Small children need a child-specific helmet with a suitable shape and a rear cradle that adjusts small enough. The critical rule is never to buy one with growing room: a helmet that moves on the head rotates during an impact and offers far less protection than a correctly fitted one. Replace it after any crash, and after a hard drop onto a concrete floor.

Can you service my child's bike even though you did not sell it?

Yes, and we would encourage it, particularly on a new bike. Bikes at this price point are frequently assembled quickly and arrive with loose headsets, badly adjusted brakes, incorrect wheel bearing preload and under-tightened stem bolts, none of which a parent would necessarily spot. A safety check costs a fraction of what the bike did and is worth doing before the first ride rather than after something goes wrong. Bring it to our Kondapur store.

Ask us anyway

If you are choosing a bike for your child and would like a second opinion, send us the model on WhatsApp. We have no product to sell you in this category, which means the advice is genuinely just advice.