I'm getting this noise as I wheels the bike in and out of the garage.I'll describe it as a knock as the rear wheels turns. I put the bike on the center stand,turned the rear wheel,it seems the knock is coming from the driveshaft area. I checked the U-joint,nothing is loose.After reading other posts on this same problem I'm going to let an expert check it out.Until then should I not ride the bike?I'm not planning on a long trip but I do like to take 50-100 miles rides out on the back roads in the cool fall air.