Tyre Storage Standards and Rubber Ageing
Clean tyres thoroughly before seasonal hibernation. Proper tyre stacking, UV protection, and the critical six-year rubber hardening timeline.
Storing tyres, on rims flat, without rims upright
Tyres with rims hold internal pressure and rim weight: stack them flat on their sides up to four high, or hang them suspended from the rim centre hole. Tyres without rims should stand upright on the floor and be rotated once a month to avoid flat-spot deformation.
The 6/10 rule, Why 10-year-old rubber is dangerous even with deep tread
Traficom and tyre manufacturers recommend the 6/10 rule: tyres should be used for at most 6 seasons from first mounting, and their total age should not exceed 10 years from the manufacturing week. Over time, natural plasticisers evaporate, leaving rubber stiff. A hardened tyre slides on ice even if it has 8 mm of remaining tread.
After 6 winters, rubber loses flexibility in frost. Tread sipes no longer bite into hard ice.
Even unused stored tyres oxidize and stiffen over a decade. Replace regardless of appearance.
Measuring tread depth with pocket coins
You don't need a special gauge to check your tyres. Common euro coins give an instant visual threshold.
Insert a 2-euro coin into the main tread groove. The silver outer rim is exactly 4 mm wide. If the silver rim stays visible, tread is under 4 mm and slush resistance is compromised.
Insert a 1-euro coin into the groove. The brass rim is 3 mm wide. While the legal minimum is 1.6 mm, wet braking distance lengthens sharply below 3 mm.
Tyre DOT code calculator
Type the 4-digit code from the sidewall (e.g. 2422)
Safe. Rubber is supple.
Peer-reviewed studies, institutional tests, and official standards with DOIs and canonical URLs.