Buying a bike helmet: how to choose the right helmet for every ride

Buying a bike helmet sounds straightforward until you have to choose between an adult bike helmet, children’s bike helmet, skateboard helmet or multisport helmet. Product pages often highlight LED lighting, ventilation or “impact protection”, but these features mean little if the size is wrong or the helmet does not fit your needs.

Three common pitfalls are:

• A one-size-fits-all helmet that does not fit properly: an adjustable bike helmet can only work well within its stated size range. A helmet that wobbles, slips or creates pressure points will not protect you as intended.
• Marketing around lighting: a bike helmet with an LED light can improve your visibility, but it does not replace bike lights or reflective clothing. Also check how the light is charged and which modes are available.
• The wrong helmet shape for the activity: a lightweight urban helmet is not automatically suitable for BMX, downhill riding or intensive skateboarding. A BMX helmet or full-face mountain bike helmet covers different areas of the head and is designed for a different purpose.

What should you look for when buying a bike helmet?

1. Measure your head circumference first

Use a tape measure to measure horizontally around your head, approximately one to two centimetres above your eyebrows. Keep the tape measure in contact with your head, but do not pull it tight. Compare the result with the size chart for the specific model.

Do not just look at the letter S, M or L. Measurements vary by brand and model. For example, the DKONI HS-158 is available for head circumferences of 48–55 cm, 52–58 cm and in a larger version. The OutdoorMaster Oryx models have separate sizes, including 54–58 cm.

A good fit means:

1. The helmet sits horizontally and covers your forehead without blocking your vision.
2. The adjustment dial keeps the helmet stable without creating uncomfortable pressure.
3. The chin strap sits under your chin and does not form a loose loop.
4. The helmet does not slide forwards or backwards when you move your head.

2. Check the materials and safety information

Many bike helmets combine a hard outer shell with foam on the inside. Product descriptions commonly refer to PC, ABS, EPS and EPP:

• PC or polycarbonate: a hard outer shell which, according to the product information, is designed to support the structure.
• ABS: a plastic outer shell used in various bike, skate and multisport helmets.
• EPS: foam used in many helmets as an energy-absorbing inner layer.
• EPP: a foam material used in certain full-face models, among others.

Also check which standard or certification is stated on the product page and product label. The DKONI HS-158 lists CPSC, CE and ASTM. The OutdoorMaster RhinoUrban lists CPSC and ASTM. These are verifiable product details, but a listing alone does not prove that a helmet is suitable for every sport or every type of impact. Always check the official documentation, usage limitations and EU conformity information.

According to the brands’ own product information, certain models are intended for cycling, skateboarding, BMX or mountain biking. Treat this information as the manufacturer’s usage advice and do not choose an urban helmet for activities where a different helmet model is recommended.

3. Consider comfort, visibility and maintenance

For commuting and longer recreational rides, ventilation and a washable lining are practical features. Check:

• the number of ventilation openings;
• whether the inner lining is removable;
• whether the lining can be hand-washed;
• whether the helmet leaves room for glasses;
• whether a visor is removable or adjustable;
• how a rechargeable bike helmet is charged.

An LED light at the front or rear is an additional feature, not a replacement for legally required bike lights. Check that the light is sufficiently charged before setting off. You should replace a helmet after a hard fall or collision, even if there is no obvious external damage. Always follow the manufacturer’s instructions.

Our recommendations for different uses

Suitable for: Budget-conscious beginners

OutdoorMaster Oryx Adults Skateboard Cycling Helmet - Grey M

Why it suits this profile: A practical choice for anyone who wants to combine cycling, skating and skateboarding without buying a different helmet for every activity. This model is available in size M for a head circumference of 54–58 cm.

How this product avoids the pitfall

The product description states that it has an adjustable dial, chin strap and two removable linings. This allows you to adjust the fit and maintain the lining.

Key benefit & highlights

ABS outer shell, EPS inner layer, ventilation and compatibility with bicycles, BMX bikes, skateboards and inline skates.

Suitable for: Shoppers looking for premium quality

OutdoorMaster RhinoUrban Mountain & Road Bike Helmet with rechargeable light

Why it suits this profile: Suitable for adults who combine urban rides, road cycling and mountain biking, and value additional visibility.

How this product avoids the pitfall

According to the product information, the light can be recharged via Type-C. This means you do not need to insert separate batteries, but you will need to recharge it regularly.

Key benefit & highlights

17 ventilation openings, adjustable fit, removable glasses and sun visor, plus an integrated rear light. The product information lists CPSC and ASTM.

Suitable for: Specialist use & intensive riders

OutdoorMaster Full Face Mountain Bike Helmet for adults

Why it suits this profile: A full-face model for users who take part in downhill riding, BMX or intensive mountain biking and want more coverage than a standard urban helmet provides.

How this product avoids the pitfall

The full-face design is clearly intended for a different type of use than commuting. This helps prevent you from using a basic bike helmet for an intensive discipline where greater coverage may be preferred.

Key benefit & highlights

ABS outer shell, EPP inner layer, chin bar, chin protection pads, 27 ventilation channels, adjustable visor and removable washable lining.

For children aged 5 to 13

The RoyalBaby Everest and RoyalBaby Moon are children’s bike helmets for a head circumference of approximately 52–56 cm. The Everest has an adjustment dial, adjustable straps, ten ventilation openings and a removable lining. According to the product information, the Moon also features an integrated rear light with three modes and a fixed visor.

Measure children’s heads regularly. A helmet that fitted last season may now be too small. Also check the buckle: it should fasten without pressing against the throat. A children’s helmet is not a substitute for supervision, following traffic rules or riding appropriately.

Frequently asked questions about buying a bike helmet

How should a bike helmet fit?

The helmet should sit horizontally on your head. There should be little space between the helmet and your head, without the helmet feeling tight. Adjust the dial first, then fasten the chin strap. Open your mouth: the strap should tighten slightly, but must not press against your throat.

How long does a bike helmet last?

Replace the helmet after a serious fall or collision, even if there is no visible damage. Also check the shell, buckles, straps and lining regularly. Some manufacturers recommend replacing helmets after three to five years, as materials can deteriorate over time. Follow the replacement period stated in your model’s manual.

Is a bike helmet with an LED light enough for cycling in the dark?

No. An LED light on the helmet can improve visibility, but it does not replace suitable bike lights fitted to the bicycle. Check the charge level of a rechargeable bike helmet before setting off, and also use reflective elements and the lights required for your situation.