I have a mullet bike , so had to choose other. My ebike came stock with front 29x2.6 and rear 27.5x2.8
I tried at least 5 2.8 rear tires and after a while would flat out at some point. I gave up on a plus rear tire.
Front 29x2.6 & rear 27.5x2.6 to 2.4 Whatever deal I can get as I go through rear tires way to fast!!!