WheelTireHub tools

Tread Life Estimator

Predict the kilometres and months left on a set of tires from current tread depth, annual driving distance and (optionally) install date. Includes age-related advisories.

Estimate the kilometres and months left on a set of tires from the current tread depth, original tread depth and annual mileage. The tool also flags age-related risk: rubber compounds harden after 6 years and lose elastic grip — independent of remaining tread.

Legal minimum tread depth in Canada is 2/32" (1.6 mm). Most provinces consider 4/32" marginal for winter conditions, and tire-industry recommendations call for replacement at 4/32" for wet-weather safety.

Tire condition

6/32″
Quick fill · typical annual distance
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Tread remaining
Kilometres remaining
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Months remaining
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Tread depth reference

Tread depth in 32nds of an inch and millimetres, with safety status

11/32″
8.7 mm
Brand new
8/32″
6.4 mm
Good
6/32″
4.8 mm
Acceptable
4/32″
3.2 mm
Watch closely
2/32″
1.6 mm
Legal limit
< 2/32″
< 1.6 mm
Unsafe

Pro tips for installers

Measure all four corners.Measure across multiple ribs and on at least two corners — uneven wear means alignment, suspension or rotation issues that affect the estimate.
Tires age out at 10 years.Rubber compounds oxidise and stiffen over time. Most manufacturers cap tire life at 10 years from manufacture date — replace then, even with deep tread remaining.
Rotate on schedule.Cross-rotate every 8,000–10,000 km to keep wear even. Front-drive cars wear front tires twice as fast as rears — without rotation you replace half a set early.
Mind the pressure.Under-inflation accelerates shoulder wear; over-inflation accelerates centre wear. Check pressure cold once a month and after major temperature swings.
Replace by the worst corner.Replace based on the lowest-tread corner across all four tires. A single corner under 4/32" in winter is a stopping-distance liability for the whole set.
Read the DOT date.The DOT code on the sidewall ends in a 4-digit week+year stamp (e.g. "3823" = week 38 of 2023). Always check the freshest set on the rack — manufacturing date starts the 10-year clock.

Estimates assume linear wear at the entered annual mileage. Real-world variance is ±20% based on driving style, alignment, rotation cadence, climate and tire pressure. Replace based on the lowest-tread corner across all four tires.