I recently bought a used FJR1300 with different brands of tyre on the front and rear. Both are near new - front is a Metzeler and rear is a Michelin. I have read somewhere that this is not a good idea and that both tyres should be the same brand and model so that you have the same tread pattern front and rear. I would appreciate people's comments. Should I be replacing one of the tyres so that I have only one brand on the bike? Is this a safety concern? Thanks.