Our stated max. approved tire clearances always factor in at least 5 mm of clearance to any part the frame and fork to account for variances in actual tire width, lateral runout of the wheels and enough mud clearance. Whereas a slightly wider tire could fit, you´d do that on your own risk and a damage to the bike because of that is not covered by our warranty. Often enough the width is not the limiting factor but the tire height as this increases with the tire width as well. It is best advice to do a test fit of the tires in mind before and check the clearance at max. pressure rating, if there is at least 5 mm of clearance then it´s fine from our side.