I had a bounce with my front before.... check to see if the tire is mounted properly.... there is a yellow or white dot on the tire... it should line up with the stem on the rim. If you mounted it yourself... easily overlooked . If a shop did it... it still could have gotten missed... this doesn't always throw it out of balance ... but it could. Also if it has a tube in it... deflate and inflate again to make sure there are no wrinkles in the tube causing an internal heavy spot..... just some thoughts.