24-06-17, 02:55 PM
As far as I can make out from a quick look around, up to about 5 or 6 years old is acceptable, but depends on how they have been stored. There should be a code on the tyre sidewall which gives the date of manufacture. You may find unused tyres older than this which look to be in perfect condition, but then it has to be your choice as to whether there is any added risk to accept. Have a Google around on "motorcycle tyre shelf life."