They are 25x10x12 at all four corners. I'm going to replace the fronts with 25x8x12 tires though. The wider width front tires tends to make the tires grab the sides of ruts more, and also makes the front end push a little bit too much on fast corners. I think the wider width does very little to help traction where I ride, but is causing poorer handling. The rears are wearing a lot faster than the fronts anyway, so I'll just get another narrower set of front tires, and have two sets of rear tires.