My 1999 still has original tires, Michelin LTX (61,000 miles). They need replacing. My spare has never been on the ground and I would like to use it as one of my tires and purchase only three tires but not Michelin. Would like to use BF Goodrich as they are quite a bit cheaper. Any bad safety concerns mixing brands of tires this way. I know in the past you never mixed bias and radials but these would all be radials.