I bought a pair of tires for my VStrom and just received the tires today. Checked the date of manufacture and they are already 5 years old. I’m not thinking this is a good thing as many suggest you should get new rubber every 6 years. Already complained to the vendor and haven’t heard back from them yet. Should I be concerned and return them, or just slap them on and use them? Tread compound is very soft to the touch but that’s not a good way of testing whether they’re suitable for safe use.