Hey guys and gals...got a quick question. I am searching for a matching set of dual sport tires to put on my kz440. I've been looking at IRC's. The problem is I am having a hard time finding a front tire. I want the front to be 3.5/18 and the rear 4.0/18. I find the size I need for the rear, but cant find the size for the front. The fronts tend to be all too small or too big (17or21) My question is.... can I mount a rear tire to the front wheel? I know their is a difference between front and rear tires as far as weight load/performance goes...any help would be great! Thanks!