Every Tyre Has a Birth Date
Every tyre manufactured worldwide has a date code stamped into the sidewall. This four-digit number tells you the week and year the tyre was made. If your tyres are due for replacement, browse our range of new tyres. This four-digit number the tyre was made. Knowing how to read it is important because tyres degrade over time, even if they've never been driven on.
How to Read the DOT Date Code
Look for the letters DOT on your tyre sidewall, followed by a series of numbers and letters. The last four digits are the date code:
Example: DOT XXXX XXXX 2523
- First two digits (25) = Week 25 of the year
- Last two digits (23) = Year 2023
This tyre was made in the 25th week of 2023 (June 2023).
Why Tyre Age Matters
Rubber is a natural material that deteriorates through oxidation and UV exposure, even when stored indoors. Over time, the rubber compounds harden, lose elasticity, and become prone to cracking. The result is reduced grip, longer braking distances, and increased blowout risk.
When to Replace Based on Age
6 years: Most tyre manufacturers recommend replacing tyres at 6 years from manufacture, regardless of tread depth or appearance.
10 years: The absolute maximum. No tyre should be used beyond 10 years, even as a spare.
NZ conditions: In NZ's UV-rich environment, rubber degrades faster than in cooler climates. We recommend a professional inspection at 5 years.
Check Your Spare Tyre Too
Spare tyres are often forgotten in the boot for years. They're exposed to heat cycling (especially in summer) and rarely get checked. If your spare is over 6 years old, it may not be safe to use in an emergency. Check the date code today.
New vs Old Stock
When buying new tyres, check the date code. At Carter's Tyres Pukekohe, our fast turnover means our stock is always fresh — typically manufactured within the last 12 months. We move over 10,000 tyres per year, so you're always getting current production. Browse our fresh stock online.