I've seen a few articles that suggest both front and rear tyres should be changed at the same time. Given I'm a tigh-fisted w**ker, I don't like to throw away the approximate 5,000km still remaining on my rear tyre.
Also, it seems many buy matching front and rear (eg. both Bridgies, or both Pirelli, etc.)... does this really matter?
I don't think any of this holds true. The fact that the tyres at each end of the bike perform totally different functions, have totally different profiles, each wearing at different rates, and the darksiders are placing car tyres on the rear - all would suggest it's a myth.
What are you thoughts? Do you strive to get the front and rear matching perfectly? Does it make a difference?