My rear tyre is nearly squared off and almost at the tread wear indicators at 4500 miles so I'm looking to replace it in a few hundred miles time. The OE front Bridgestone is fine. What's best - stay with Bridgestone and fit the Battlax (are these the OE ones now or is there amother Bridgestone in ths size) or change to a Diablo? If I changed to a Diablo would it be okay to mix the tyres or should that be changed as well? Do either of those claim to have harder rubber in the centre to delay the squaring off and if so, what mileage have others on here got from them?