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Tyre age

V

Veerzigzag

New member
Having just fitted refurbished Cup wheels, close inspection of the original wheels was a shock - the tyres are noticeably perished. Considering the stresses they go though (within the prevailing speed limits, you understand) close examination of a cracked sidewall is scary. The production date is at the end of a character string on the sidewall that starts "DOT ... " - the last set of 3 or 4 numbers is the week and year. So for example 408 would be week 40 of 2008, and 3504 would be week 35 of 2004. The fronts (original size 195/65) are 14 years old, and looking at my history file that is 46,000 miles, with 4mm tread still left. Previous owners were clearly careful drivers. Worth checking the sidewalls closely, if there is a history of low annual mileage.
 
Good spot, when I had my BSA years ago it failed its MOT with cracked sidewalls, worth checking. Same goes for the spare wheel really, most are now 25 years old!



Edd
 
Excluding straightforward wear, the main factors causing tyres to deteriorate are calendar age, exposure to ultra-violet (for which read daylight in its various strengths), the number of heat cycles they have been through (basically the number of journeys regardless of length), heat, and exposure to some chemicals, especially hydrocarbons (fuel, oil etc).

Generally I don't trust more tyres more than about six or seven years old even if they have had a fairly gentle life.
 
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