The tread design on mud-grip/off-road tires usually cause the sensation of pulling to the right. A guy I work with had them put on his T100 and he had to fight just to keep it on the road. He put his stock street tires back on and viola! no more pull to the right. He had not changed anything in his suspension, just changed tires, to cause the problem. Now he only runs the off-road tires when he goes hunting.