WHEELS AND TYRES

A wheel rim is the metal part that holds your tyre in place. The pressed steel rim, commonly found on commercial vehicles like Danfo buses in Lagos, is affordable and strong but heavier. Disc wheels have a solid centre and are standard on modern cars because they dissipate heat better during braking. Wire spoke wheels, typical on motorcycles and classic vehicles, look stylish but require careful maintenance.

The hub is where the wheel attaches to the vehicle's axle using nuts and bolts or a special locking mechanism. Proper hub attachment is critical for safety—loose wheels cause accidents. Wheel balancing removes uneven weight distribution, preventing vibration and steering problems. You'll notice this when your car shakes at high speed.

Tyre markings like "175/70R13" tell you the tyre width, sidewall height ratio, construction type, and rim diameter in inches. These markings ensure you buy the correct replacement tyres for your vehicle.

A tubed tyre has an inner tube filled with air inside the rubber tyre, while a tubeless tyre holds air directly within the tyre itself without a separate tube. The tube in a tubed tyre is made of rubber and can be removed and repaired independently.

Tubed tyres are cheaper to buy and easier to repair, making them popular for motorcycles and older vehicles in Nigeria. However, they heat up quickly and puncture easily. When punctured, all air escapes rapidly, causing sudden deflation. Tubeless tyres are found on modern cars and maintain air pressure better even when slightly punctured. They run cooler, last longer, and provide better fuel economy. The disadvantage is that they cost more initially and require special equipment for repairs.

Most commercial buses and trucks you see on Nigerian roads use tubed tyres because replacement tubes are affordable and readily available at roadside mechanic shops.

When your car's wheels aren't balanced, you'll feel the steering wheel vibrating at certain speeds. Wheel balancing means distributing weight evenly around the wheel so it spins smoothly. A mechanic uses special machines to identify heavy spots and adds lead weights to correct this problem. Think of it like a spinning top – if it's unbalanced, it wobbles.

Tyre sizes appear as numbers like 195/65R15. The first number (195) is width in millimetres, the 65 is the sidewall height as a percentage, R means radial construction, and 15 is the rim diameter in inches. A Danfo bus might use 225/70R15 tyres, which are wider and stronger for carrying passengers.

Tyre markings show manufacturing date, safety ratings, and tread wear indicators. These tiny bars on the tyre surface warn when replacement is needed.