I have a new to me 2013 BX25 with 370 hours. The front tires need replaced being they're worn almost all the way on the outside edges, the back tires look fine with deep tread but I'm not sure how deep they were originally. I'm thinking about replacing the fronts only but I'm a little concerned that the new overall circumference of the new tires might conflict with the overall circumference of the original rear tires in 4WD. Any thoughts?