Wanting a vintage look, I have installed a Dunlop K81 4.25-18 on the rear. The recommended tire size for the front is 3.25-19. It seems the only front wheel Dunlop K81 available is a 4.10-19. Will this fit the 1972 CB 750 front wheel without interfering with fender etc? A K70 in 3.25-19 is available. Would the dissimilar tread patterns look offensive to the purist? This bike will never be ridden at the recommended maximum speeds of these tires.