FYI for those who are interested. There is a small oval shape on the sidewall of the tyre that has the date code moulded into it. The code is 4 numbers (3 if they were made in the 90's) with the first 2 being the week of production and the second 2 being the year. As an example if the code is 2704 then the tyre was made in the 27th week of 2004, so early July.