My car has been off the road for a few months, but will be back on it in a few weeks. The other day, I noticed some cracks between the treads on the front tyres. Not sure how long they've been there.
I know tyres cracking can be bad, but I'm not sure how much is required before a cosmetic problem turns into a safety issue.
Should these be replaced? Also, it's really only the front two that have significant cracking. Would it be reasonable to replace them and leave the back two for the time being?