Tire pressures are within spec, but the bike doesn’t seem as sure-footed as it used to. I’ve checked the steering head, swingarm, wheels, and bearings. I jacked up both ends to check the tires for high spots, flat spots, and runout—nothing was amiss. I didn’t think the change in windshields could have this effect, but when I took the shield off completely the squirm seemed slightly reduced but still there. Any ideas what could cause this?