FAQs

A: You’ll find several numbers on the sidewall of your tyre, often grouped together. Your tyre size is usually shown in a format like XXX/XXRXX. Check the next question for a breakdown of what each number means.

A: These numbers work together to describe your tyre’s key specifications, including width, profile, rim size, load capacity, and speed rating:

235 — Tyre width in millimetres (the measurement from sidewall to sidewall).

45 — Aspect ratio or profile, representing the sidewall height as a percentage of the tyre’s width. Here, the sidewall height is 45% of 235mm.

R — Radial construction, the most common tyre construction type today.

17 — Rim diameter in inches, indicating the wheel size your tyre fits.

94 — Load index, showing the maximum load each tyre can carry. A rating of 94 means the tyre supports up to 670 kg.

W — Speed rating symbol, indicating the maximum safe speed. A “W” rated tyre is tested to handle speeds up to 270 km/h safely.

A: While the legal minimum tread depth is 1.5mm in New Zealand, many tyre experts and manufacturers, including Sailun Tyres NZ, recommend replacing tyres when tread depth falls below 3mm to ensure optimal performance, especially in wet conditions.

A: If your steering wheel shakes consistently at a steady road speed, it usually means your wheels need balancing. While wheels are balanced when first fitted, factors like wear, impacts, and temperature changes can cause imbalance over time. To ensure a smooth and safe drive, have your vehicle checked at a trusted automotive centre.

A: If your vehicle pulls excessively to one side or your steering wheel sits crooked when driving straight, it’s a clear sign you need a wheel alignment. Most vehicles require wheel alignment every 15,000 to 20,000 kilometres to ensure even tyre wear, precise steering, and predictable handling. Schedule a check-up and alignment service at a trusted automotive centre to keep your drive safe and smooth.

A: In most cases, yes—you can repair a tyre. When properly inspected and repaired by a professional, a tyre can safely continue for the remainder of its expected life. However, not all tyre damage is repairable. For example, damage to the tyre’s sidewall cannot be reliably fixed and requires replacement. Sidewall damage weakens the tyre’s structural integrity and increases the risk of blowouts and accidents.