is to only use a matching set, sometimes I keep the other tyre in my garage and then change back later.
Many will tell you it is rubbish and you can run un matched tyres.
Well of course you can.........but remember that tyres are designed to match front and rear tread patterns and some different brands tyre profiles are totally different.
If you aren't pushing the boundaries and riding in the dry it
MAY not be an issue. many mix tyres but I DO NOT.
I have high regard for the PR2.
DaveM