Why Tyres Deserve More Attention Than Most Drivers Give Them

Tyres are the only part of your vehicle in contact with the road, yet tyre checks remain one of the most consistently neglected aspects of routine car ownership. Under-inflated tyres increase braking distances, raise fuel consumption, and wear unevenly. Over-inflated tyres reduce grip and make the ride harsher. Neither condition is immediately obvious from inside the cabin — which is exactly why a structured check matters.

Under German road law (StVZO) and broader EU vehicle regulations, drivers carry legal responsibility for ensuring tyres are roadworthy. A failed roadworthiness inspection (Hauptuntersuchung, or HU) can result from tyre deficiencies alone. Beyond compliance, the practical safety case is straightforward: tyres in poor condition are a leading contributor to loss-of-control incidents, particularly in wet or cold conditions.

The checks below take between 15 and 30 minutes for a full set of four tyres plus a spare. They require minimal equipment and no mechanical expertise. For a broader overview of what experienced drivers keep on top of consistently, see things long-term car owners always keep on top of.

Required

Digital Tyre Pressure Gauge

Provides an accurate pressure reading in bar or PSI; more reliable than many forecourt units.

Required

Tread Depth Gauge

Measures tread depth precisely at multiple points across the tyre face.

Optional

Portable Tyre Inflator

Allows pressure correction at home or roadside without depending on a petrol station compressor.

Required

Torch or Inspection Light

Needed to examine the inner sidewall and spot damage that is not visible in normal light.

Required

Vehicle Owner's Manual

Contains manufacturer-specified tyre pressures for different load conditions and tyre size fitments.

The Complete Tyre Check Checklist

Work through each tyre systematically — front left, front right, rear left, rear right, then the spare. Consistency matters: skipping one tyre in a rush undermines the entire inspection. If any item below reveals a concern, consult a qualified tyre specialist before driving significant distances.

Pressure Check

Locate the manufacturer's recommended pressure values, which are printed on a sticker inside the driver's door jamb or in the owner's manual — not on the tyre sidewall itself. Must
Check pressure when tyres are cold — ideally before the car has been driven more than 2 km — since driving heats air inside the tyre and raises readings by up to 0.3 bar. Must
Use a calibrated digital or analogue gauge rather than relying on petrol station forecourt displays, which can be poorly maintained and inaccurate. Should
Adjust pressure to match load: most vehicles specify a higher rear pressure when carrying passengers or a heavy boot load — check the door-jamb label for both light and laden values. Should
Check spare tyre pressure at the same time; a spare inflated to the wrong pressure is useless in an emergency. Must

Tread Depth

Measure tread depth at a minimum of three points across the tyre width — centre and both shoulders — using a dedicated tread depth gauge. Must
Confirm that no point falls below the EU legal minimum of 1.6 mm; plan to replace tyres approaching 3 mm, which is when wet-weather grip begins to degrade meaningfully. Must
Use the built-in tread wear indicators (TWIs) — small raised bars moulded into the tyre grooves — as a quick visual fail/pass reference between gauge checks. Should
Record measurements for each tyre so you can compare them at the next check and catch accelerating wear early. Nice to have

Visual Sidewall and Surface Inspection

Examine the full sidewall of each tyre for cracks, cuts, or bulges — any bulge indicates internal structural damage and the tyre must not be driven on. Must
Look for embedded objects such as nails, screws, or glass; do not remove them roadside — a plugged or slowly deflating tyre needs professional assessment. Must
Check the tyre age: the DOT code on the sidewall ends with a four-digit week/year stamp. Tyres older than six years should be inspected by a specialist; those over ten years should be replaced regardless of visible condition. Should
Inspect the inner sidewall (the face closest to the vehicle) with a torch — this area is invisible during casual walkarounds and is where kerbing damage most often hides. Should

Wear Pattern Assessment

Compare tread wear across all four tyres: significant differences between the front and rear axle pairs may indicate incorrect rotation intervals or a mechanical issue. Should
Look for feathering or diagonal scalloping, which signal alignment or suspension problems that a tyre replacement alone will not solve. Should
Note whether wear is concentrated on one edge of a single tyre — asymmetric wear on one wheel is a red flag for alignment drift or a damaged suspension component. Must

After the Check

Ensure all valve caps are replaced firmly after pressure adjustments — they prevent moisture and dirt from contaminating the valve core. Must
Log the date, mileage, and pressure readings in a simple maintenance record so you have a reference point for the next check. Nice to have
If your vehicle is fitted with a tyre pressure monitoring system (TPMS), remember that most direct TPMS systems only alert when pressure drops around 25% below the recommended value — far below the threshold where handling is already affected. Should

Mixing Tyre Types on the Same Axle Is Illegal and Dangerous

Fitting different tyre constructions — for example, one radial and one cross-ply — on the same axle is prohibited under German StVZO regulations and most EU member state road laws. It also creates asymmetric braking and cornering behaviour that can destabilise the vehicle. Always fit matching tyre types per axle, and ideally across all four wheels.

For drivers preparing for extended travel, these checks slot directly into a broader pre-departure review. Our pre-departure safety check for long road trips covers tyres alongside fluids, lights, and documentation in a single structured format.

Reading What Your Tyres Are Telling You

Wear patterns communicate more than a gauge can. Centre wear — where the middle of the tread is more worn than the edges — typically indicates chronic over-inflation. Edge wear on both shoulders points to persistent under-inflation. Wear on only one edge, or a diagonal pattern across the tyre, usually signals a wheel alignment or suspension issue that no amount of pressure adjustment will fix.

Feathering (where tread blocks feel sharp on one side and rounded on the other when you run a hand across them) is a classic indicator of incorrect toe alignment. Cupping or scalloping — a wavy, uneven depth across the tread — often points to worn shock absorbers. Both conditions accelerate tyre degradation and affect handling.

Do Not Drive on a Visibly Bulging Tyre

A sidewall bulge means the internal carcass has been compromised — typically by a sharp impact with a kerb or pothole. The tyre can fail suddenly at speed, causing immediate loss of vehicle control. Do not attempt to drive to a garage on a bulging tyre; have the vehicle recovered or change to the spare wheel first.

TPMS Is a Warning System, Not a Substitute for Manual Checks

Tyre pressure monitoring systems are mandated on new EU vehicles sold from 2014, but they are not a replacement for manual inspection. Most indirect systems measure wheel rotation speed, not actual pressure, and direct systems typically only trigger at pressures already well below the safe threshold. Rely on monthly manual checks as your primary method.

Tyre condition also varies by season and road environment. Wet winters, road salt, and temperature swings all affect rubber compound integrity and grip performance. Our article on seasonal car care and maintenance explains how to adapt your routine through the year, including when to consider switching between summer and winter tyre specifications.

If you are evaluating a used vehicle and want to assess tyre condition as part of a broader pre-purchase review, the questions worth asking before committing to any vehicle covers tyre age, wear history, and what the seller should be able to tell you.