This lesson guides you through the technical requirements for vehicle tyres in Switzerland. You will learn how to maintain safety through proper inflation and tread monitoring, ensuring your vehicle meets legal standards for all weather conditions. These skills are vital for both your theoretical exam and your future as a responsible driver on Swiss roads.
Lesson content overview
Tyres are the sole point of contact between your vehicle and the road, making their condition paramount for safety, handling, and fuel efficiency. Neglecting tyre maintenance can lead to dangerous situations, compromise braking performance, and even result in legal penalties. This chapter of your comprehensive Swiss driving theory course for Category B license will equip you with the essential knowledge to maintain, select, and inspect your vehicle's tyres according to Swiss regulations and best practices.
The performance of your vehicle, from braking and steering to acceleration and fuel consumption, is fundamentally dependent on the condition of your tyres. Properly maintained tyres ensure optimal grip, stability, and control, which are vital for reacting safely to various road conditions and avoiding accidents. Understanding the key aspects of tyre maintenance and selection is not just a recommendation; it is a crucial component of responsible driving and roadworthiness.
Tyre pressure refers to the amount of air inside a tyre, typically measured in bar (or pounds per square inch, psi). Maintaining the correct pressure is perhaps the simplest yet most critical aspect of tyre maintenance. It directly affects the tyre’s contact patch—the area of rubber that touches the road—which in turn influences grip, handling, braking distance, and fuel efficiency.
It is crucial to understand the difference between cold and hot tyre pressure. The manufacturer's recommended pressure, found on a sticker usually inside the driver's door jamb, in the owner's manual, or on the fuel filler flap, refers to cold pressure. This is the pressure measured when the tyres have not been driven for at least three hours, or have travelled less than a few kilometres at low speed.
When a vehicle is driven, the tyres flex and generate heat, causing the air inside to expand and the pressure to increase. This higher reading is the hot pressure. It is normal for tyre pressure to be higher after driving, but this hot reading should not be used for verification or adjustment. Always check your tyres when they are cold to get an accurate measurement against the manufacturer's specifications.
Always check your tyre pressure when the tyres are cold. If you must check them when hot, remember that the pressure will be higher, and adjust to the cold pressure specification only after the tyres have cooled down completely.
Regular tyre pressure checks are essential, ideally at least once a month and always before long journeys. Underinflated tyres increase rolling resistance, leading to higher fuel consumption and uneven wear on the tyre's outer edges. They can also overheat, significantly increasing the risk of a blowout. Conversely, overinflated tyres reduce the contact patch, leading to less grip, a harsher ride, and uneven wear on the centre of the tread.
Locate the manufacturer's recommended cold tyre pressure for your vehicle. This information is typically found on a sticker inside the driver's door frame, in the glove compartment, or on the fuel filler flap. Note that recommended pressures may differ for the front and rear axles, and often for different loading conditions (e.g., normal load vs. full load).
Ensure your tyres are cold. If you have driven the vehicle, allow at least three hours for the tyres to cool down.
Remove the valve cap from one tyre.
Press a calibrated tyre pressure gauge firmly onto the valve stem. The gauge will display the current pressure.
Compare the reading with the recommended cold pressure. If the pressure is too low, add air using an air compressor (available at most petrol stations). If it's too high, release air by pressing the small pin in the centre of the valve stem until the correct pressure is reached.
Repeat the process for all four tyres, and don't forget the spare tyre if your vehicle has one, as it also needs to be correctly inflated. Replace all valve caps securely.
The tread pattern on your tyres is designed to provide grip on various surfaces and, crucially, to channel water away from beneath the tyre. This water evacuation capability is essential for preventing hydroplaning (also known as aquaplaning), which occurs when a layer of water builds up between the tyre and the road surface, causing the tyre to lose contact and the driver to lose control.
In Switzerland, the legal minimum tread depth for all motor vehicles is 1.6 millimetres (mm) across the central three-quarters of the tread width. Driving with tyres below this minimum depth is illegal and poses a significant safety risk, especially in wet conditions. While 1.6 mm is the legal minimum, many experts and driving organisations recommend a tread depth of at least 3 mm for optimal safety and performance, particularly for winter tyres and in heavy rain. This provides a greater margin of safety, as wet braking performance deteriorates significantly as tread depth approaches the legal minimum.
Tyre manufacturers incorporate small, raised bars within the main grooves of the tyre tread pattern. These are called Tread Wear Indicators (TWIs). When the tyre tread has worn down to the same level as these indicators, it means the tyre has reached its minimum legal tread depth (1.6 mm) and must be replaced immediately.
You can also check tread depth using a simple tread depth gauge or even a 1-franc coin. If the coin's Helvetia figure is visible above the tread, your tyres are likely below the recommended depth and close to the legal limit. Regular visual inspections for overall wear and damage, alongside using a gauge, are crucial.
Many drivers mistakenly believe that a tyre is safe as long as it has sufficient tread depth. However, tyres, like any rubber product, degrade over time due to exposure to sunlight, oxygen, heat, and general environmental factors. This degradation leads to the rubber becoming harder, less flexible, and more prone to cracking, even if the vehicle is not driven frequently or the tread appears adequate.
The date of manufacture for a tyre is encoded in the DOT code (Department of Transportation code) found on the tyre's sidewall. This code usually consists of several letters and numbers, with the last four digits indicating the week and year of manufacture. For example, a DOT code ending in "2319" means the tyre was manufactured in the 23rd week of 2019.
A series of letters and numbers on the tyre sidewall, with the last four digits indicating the week and year of manufacture (e.g., 2319 = week 23 of 2019).
Swiss authorities strongly recommend replacing tyres after six years from their manufacturing date, regardless of their visual condition or tread depth. Beyond this age, the rubber compounds lose their elasticity and resistance, significantly increasing the risk of sudden tyre failure, such as a blowout, especially at high speeds or under heavy loads. This guideline is a crucial safety measure that accounts for the natural ageing process of tyre materials.
Do not underestimate the danger of old tyres. Even if they look good, the rubber's chemical properties degrade over time, making them less safe.
Beyond pressure and tread, two other critical specifications determine a tyre's suitability for a particular vehicle: the load index and the speed rating. These are also found on the tyre's sidewall and must match or exceed the specifications provided by your vehicle manufacturer.
The load index is a numerical code that indicates the maximum weight a single tyre can safely support when inflated to its maximum safe pressure. For example, a load index of "91" means the tyre can carry 615 kg. You must ensure that the tyres fitted to your vehicle have a load index equal to or greater than the vehicle's specified maximum load capacity, which is typically found in your vehicle's registration documents or owner's manual. Using tyres with an insufficient load index can lead to tyre overload, excessive heat buildup, premature wear, and even catastrophic tyre failure, especially when the vehicle is fully loaded or towing a trailer.
A numerical code (e.g., 91) on the tyre sidewall indicating the maximum load (in kilograms) a single tyre can safely carry.
The speed rating is an alphabetical code that indicates the maximum speed at which a tyre can safely operate for a sustained period under its specified load. For instance, an "H" rating means the tyre is safe up to 210 km/h, while a "V" rating goes up to 240 km/h, and a "W" rating up to 270 km/h. It is legally mandatory for your tyres to have a speed rating that is equal to or higher than your vehicle's top speed as specified by the manufacturer. Using tyres with a lower speed rating than your vehicle's maximum capability can cause them to overheat, leading to structural damage and a high risk of a blowout at high speeds. The only exception generally allowed is for winter tyres, where a lower speed rating is permissible, provided a sticker indicating the tyre's maximum speed is displayed prominently within the driver's field of vision.
An alphabetical code (e.g., H, V, W) on the tyre sidewall indicating the maximum speed (in km/h) a tyre can safely handle.
Switzerland experiences a wide range of weather conditions, from hot summers to cold, snowy winters in mountainous regions. Using the correct type of tyre for the season is paramount for safety and optimal performance.
Summer tyres are designed for temperatures generally above 7°C. They feature a shallower tread pattern and a harder rubber compound that provides excellent grip on dry and wet roads in warm conditions. The stiffer rubber ensures stable handling and efficient braking, making them ideal for spring, summer, and autumn driving when temperatures are mild. However, their compound becomes too hard in cold temperatures, significantly reducing grip on cold tarmac, ice, or snow.
Winter tyres are specifically engineered for temperatures below 7°C, as well as for driving on snow and ice. They have a deeper, more aggressive tread pattern with numerous small cuts or slits called "sipes." These sipes create biting edges that provide superior grip on slippery surfaces. Crucially, winter tyres use a softer rubber compound that remains flexible in cold temperatures, ensuring better traction and shorter braking distances on cold, wet, snowy, or icy roads. While not strictly mandatory by law, Swiss traffic regulations do state that a vehicle must be equipped with tyres appropriate for prevailing road conditions. Driving with summer tyres in heavy winter conditions could lead to liability in the event of an accident.
Consider fitting winter tyres between October and Easter, or whenever temperatures consistently drop below 7°C, especially if you drive in mountainous or snow-prone areas of Switzerland.
All-season tyres (also known as "all-weather" tyres) aim to provide a reasonable compromise between summer and winter performance. They feature a tread design and rubber compound that can cope with a wider range of temperatures and conditions than either dedicated summer or winter tyres. While they can be a convenient option for regions with mild winters, they are generally not as effective as dedicated winter tyres in heavy snow or icy conditions, nor do they offer the same level of performance as summer tyres in very hot weather. For drivers who frequently encounter challenging winter conditions in Switzerland, dedicated winter tyres are still the safest choice.
Regular inspection of your tyres is a fundamental responsibility of every driver. Beyond simply checking pressure and tread depth, you must also look for any signs of damage or abnormal wear.
A thorough visual inspection should be part of your routine vehicle checks. Look for:
Under Swiss traffic law, specific requirements ensure the safety and roadworthiness of tyres:
Ignoring proper tyre maintenance and selection can lead to severe consequences, ranging from financial penalties to serious accidents.
Regular vigilance and adherence to these guidelines are fundamental for your safety and the safety of others on Swiss roads.
This lesson covers essential tyre maintenance for Swiss drivers, emphasising that tyres must maintain the legal minimum tread depth of 1.6mm (detectable via Tread Wear Indicators) and be replaced after six years regardless of condition. Cold tyre pressure must be checked monthly against manufacturer specifications, with underinflation causing outer-edge wear and overinflation reducing the contact patch. Load index and speed rating specifications must meet or exceed vehicle requirements, while seasonal tyres should be used according to the 7°C temperature threshold, with winter tyres legally permitted to have a lower speed rating if a visible speed sticker is displayed.
A short set of high-value points that capture the most important learning from this lesson.
Tyres are the sole contact point between vehicle and road; their condition directly affects braking, handling, and fuel efficiency
In Switzerland, the legal minimum tread depth is 1.6mm across the central three-quarters of the tyre width
Always check tyre pressure when cold (after 3+ hours stationary) against manufacturer specifications found on the door jamb, manual, or fuel flap
Swiss authorities recommend replacing tyres after 6 years from manufacture date regardless of visual condition or tread depth
Load index and speed rating on tyre sidewalls must meet or exceed vehicle manufacturer specifications
Explore all units and lessons included in this driving theory course.
Tread Wear Indicators (TWIs) are raised bars within tyre grooves that become flush with the tread at the legal 1.6mm minimum
DOT code's last four digits indicate manufacture date (e.g., 2319 = week 23 of 2019)
Winter tyres are essential below 7°C with softer rubber compound and deeper tread with sipes for ice/snow grip
Underinflated tyres cause outer-edge wear and overheating; overinflated tyres cause centre wear and reduced grip
Winter tyres may legally have a lower speed rating if a maximum speed sticker is displayed inside the driver's field of vision
Checking or adjusting tyre pressure when tyres are hot, leading to incorrect pressure settings
Believing tyres are safe solely based on adequate tread depth while ignoring age-related rubber degradation
Using summer tyres in cold or winter conditions assuming any tyre is sufficient for dry roads
Not accounting for different recommended pressures on front vs rear axles or different load conditions
Overlooking the spare tyre during pressure checks and inspections
Lesson content overview
A short set of high-value points that capture the most important learning from this lesson.
Tyres are the sole contact point between vehicle and road; their condition directly affects braking, handling, and fuel efficiency
In Switzerland, the legal minimum tread depth is 1.6mm across the central three-quarters of the tyre width
Always check tyre pressure when cold (after 3+ hours stationary) against manufacturer specifications found on the door jamb, manual, or fuel flap
Swiss authorities recommend replacing tyres after 6 years from manufacture date regardless of visual condition or tread depth
Load index and speed rating on tyre sidewalls must meet or exceed vehicle manufacturer specifications
Explore all units and lessons included in this driving theory course.
Tread Wear Indicators (TWIs) are raised bars within tyre grooves that become flush with the tread at the legal 1.6mm minimum
DOT code's last four digits indicate manufacture date (e.g., 2319 = week 23 of 2019)
Winter tyres are essential below 7°C with softer rubber compound and deeper tread with sipes for ice/snow grip
Underinflated tyres cause outer-edge wear and overheating; overinflated tyres cause centre wear and reduced grip
Winter tyres may legally have a lower speed rating if a maximum speed sticker is displayed inside the driver's field of vision
Checking or adjusting tyre pressure when tyres are hot, leading to incorrect pressure settings
Believing tyres are safe solely based on adequate tread depth while ignoring age-related rubber degradation
Using summer tyres in cold or winter conditions assuming any tyre is sufficient for dry roads
Not accounting for different recommended pressures on front vs rear axles or different load conditions
Overlooking the spare tyre during pressure checks and inspections
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This lesson examines motorcycle tyre specifications, explaining how correct pressure and adequate tread depth are crucial for optimal grip and handling. Learners will understand the relationship between tyre condition, road surfaces, and traction in both wet and dry conditions. The content reinforces the necessity of regular tyre inspection as a key part of rider safety.
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Find clear answers to common questions learners have about Tyre Maintenance and Selection. Learn how the lesson is structured, which driving theory objectives it supports, and how it fits into the overall learning path of units and curriculum progression in Switzerland. These explanations help you understand key concepts, lesson flow, and exam focused study goals.
The legal minimum tread depth for tyres in Switzerland is 1.6 mm. However, for winter tyres, it is highly recommended to have a tread depth of at least 4 mm to ensure safety and performance on snow and ice.
You can find the manufacturer-recommended tyre pressure in your vehicle's manual, on a sticker inside the driver-side door frame, or inside the fuel filler flap. Always check pressures when the tyres are cold.
While there is no strict calendar-based law, you are legally required to be able to control your vehicle at all times. If you are involved in an accident while using summer tyres in winter conditions, you can be held liable for negligence and face legal consequences.
They indicate the tyre's width, aspect ratio, construction type, rim diameter, load index, and speed rating. Understanding these is crucial for ensuring the tyres installed on your vehicle meet the manufacturer's safety specifications.
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