The four digits on the sidewall that were wrecking the reviews

Every tire carries a four-digit code showing the week and year it was made, enthusiast forums tell buyers to check it, and a meaningful share of them do — often photographing it before the tire is fitted. A code more than a year old reads to that buyer as old stock, whether or not the rubber is affected.

The brand had no idea this was the driver. Its one-star reviews looked like a quality problem and were treated as one. They were in fact an inventory-age problem, concentrated entirely in the slow-moving sizes: a popular size turned over in weeks, while an unusual fitment sat for eighteen months and then shipped to the one shopper in the category most likely to inspect it.

We fixed the stock first and the expectation second.

• Age-aware replenishment — slow sizes ordered in much smaller quantities and more often, accepting a worse unit cost to protect the rating.
• Age controlled at the inbound end, because the network picks whichever unit is nearest and offers no rotation guarantee — small, frequent shipments plus removal orders on anything past twelve months.
• The date code explained on the listing — what the four digits mean, what storage conditions apply, and why a recent code is not the same as performance.
• Aged stock cleared deliberately through a channel where the buyer is told the age up front, rather than shipped silently to a retail customer.

One-star reviews fell from twelve a month to three, and average inventory age dropped from fourteen months to five.

Conversion rose 44% as the rating recovered, and revenue grew 40% in five months. The smaller, more frequent orders on slow sizes cost the brand around two points of gross margin — an obviously good trade against a rating that was suppressing the entire catalog, not just the sizes causing it.