📅 Category: Education & Tips | By: Clyde Motors KE | ⏱ 4 min read
We covered tyre buying comprehensively in Blog #174 — but one critical piece of knowledge deserves dedicated attention: how to read a tyre’s manufacture date, and why this matters enormously when buying used vehicles or even apparently “new” tyres in Kenya’s market.
Understanding the DOT Code
Every tyre legally sold carries a DOT (Department of Transportation) code moulded into the sidewall — a sequence of letters and numbers that includes, at the end, a four-digit code indicating the week and year of manufacture. For example, a code ending in “2324” indicates the tyre was manufactured in the 23rd week of 2024.
This four-digit date code is the single most important piece of information for assessing tyre age — far more reliable than visual inspection alone, since rubber compound degradation from age is not always visually obvious until it has progressed significantly.
Why Tyre Age Matters Regardless of Tread Depth
A tyre’s rubber compound degrades chemically over time even without significant use — UV exposure, ozone, and simple chemical aging cause the rubber to harden and lose elasticity. A tyre with excellent tread depth but manufactured eight years ago has significantly reduced grip, particularly in wet conditions, compared to a tyre of the same tread depth manufactured eighteen months ago.
Most tyre manufacturers and safety organisations recommend replacement of tyres after six years from manufacture date regardless of remaining tread depth — and definitely by ten years under any circumstances. In Kenya’s intense UV environment covered extensively in Blog #156, rubber degradation from age may occur even faster than in temperate climates.
Why This Matters Specifically for Kenya’s Used Vehicle Market
When inspecting any used vehicle — whether buying privately or from a dealer — checking the DOT code on all four tyres (and the spare) takes two minutes and reveals information that visual tread inspection alone cannot provide. A vehicle with tyres that appear to have adequate tread but were manufactured six or more years ago should factor a tyre replacement budget into your purchase decision, regardless of what the tread depth gauge shows.
This is particularly relevant for vehicles that have spent significant time stationary — a vehicle that sat unused for an extended period before sale may have tyres that are older than the vehicle’s mileage alone would suggest, since stationary storage does not prevent age-related rubber degradation.
How to Check This Yourself
Locate the DOT code on each tyre’s sidewall — it is usually on the inner sidewall facing the vehicle, though some tyres display it on the outer sidewall as well. Find the final four digits. The first two digits indicate the week of manufacture (01–52), and the last two digits indicate the year. A tyre showing “1521” was manufactured in week 15 of 2021.
👉 At Clyde Motors, we check tyre age on every vehicle we prepare for sale. Visit clydemotors.co.ke or WhatsApp us on 0740635621.