How many miles are left on my tires? Only your tire can answer that, from two tread readings taken at known mileages. One reading gives guidance only — replace soon, or fine for now — never a mileage number. With two readings, Servik's predict_longevity tool works out your tire's own wear rate and gives the miles left as a range.
It's the question everyone asks when the tread starts looking thin — and it's a fair one. But wear varies by tire, vehicle, pressure, and driving, so no table of average tire life can tell you when your tires will reach the replacement point. The only honest way is to measure your own tire's wear twice, at known mileages, and work out its own wear rate.
A wear rate needs two points: a depth and a mileage, twice. One reading cannot produce remaining miles without assuming a wear rate, and Servik holds no tire-specific wear-rate table to assume from. So measure with a tread-depth gauge, write down the odometer reading each time, and measure the same tire both times.
Give the tool your readings as mileage and depth pairs for one tire — for example, 8/32 inch at 30,000 miles and 5/32 inch at 45,000 miles — from /tools or /chat. It computes the wear rate from your readings and projects the miles left to the 4/32 inch safer point and the 2/32 inch legal minimum.
For readings of 8/32 inch at 30,000 miles and 5/32 inch at 45,000 miles, the tool computes a wear rate of 2.0/32 inch per 10,000 miles. From the second reading it gives 5,000 miles left to the 4/32 inch safer point (interval 1,875–11,250 miles) and 15,000 miles left to the 2/32 inch legal minimum (interval 9,375–26,250 miles), with model_status "observed_wear_interval". Read the interval, not the point: the point figure is the middle of the interval, and the interval is the honest answer. The advisory says it plainly: "from YOUR tire's observed wear only — not a guarantee. Recheck tread regularly; damage and age also matter."
A single tread reading cannot become a mileage promise. A verified single reading of 3/32 inch gives verdict replace_soon — at or below the 4/32 inch safer point, with 1/32 inch left above the 2/32 inch legal minimum — and no mileage range at all, because no install mileage was given. That is the correct answer for one reading: replace soon, and measure again after the next set so the tool can work from your wear.
An interval is a projection of past wear, not a promise about the future. Damage, age, pressure, and alignment can change wear at any time. Plan for the low end of the interval, and recheck tread monthly, at the same time as tire pressure — then re-run the tool when you have a new reading.
Do not wait until 2/32 inch — that is the legal minimum, not a safe target. When the interval says the 4/32 inch point is near, ask for quotes through /get-quotes or in /chat and call a local tire shop to confirm it stocks your size.
Servik publishes no tire price, so a replacement set is priced by the shop's quote — Servik is still collecting accurate price data for tires. A tread-depth gauge costs under $10 and is the only method that tracks wear rate over time. Delaying past the safer point can cost an inspection failure: where states require a safety inspection, the inspection fee itself is commonly $12–$30, and tread below 2/32 inch fails in most states.
Call a local tire shop when a single reading is already at or below 4/32 inch, when the interval says the safer point is within a few thousand miles, when tread differs across tires, or when you see damage, bulges, or sidewall cracking. A shop inspection confirms what a projection cannot: whether the tire is safe to run to the end of its interval.
Only your own tire's wear rate can say, and that needs two tread readings at known mileages. With one reading you get guidance only — replace soon, or fine for now. With two, run predict_longevity from /tools or /chat and read the interval it returns, not the point figure.
The interval. The point figure (5,000 miles to the safer point in the worked example) is the middle of a range (1,875–11,250 miles) that reflects measurement tolerance. Plan for the low end of the interval and recheck tread regularly.
No. It is computed from observed tread wear only. Damage and age also matter — a tire can be done by age at 10 years whatever its tread, and a cut or bulge ends a tire at any mileage. That is why the advisory says to recheck tread regularly and why a shop inspection still matters.
Measure the same tire both times, and check all four. Uneven wear across tires points to alignment, pressure, or rotation problems, not to a longer life. If tread differs across tires, have a shop look at alignment and rotation before trusting any single tire's projection.
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