Before all the checking balance, check the "other" out of round. My one in a million 1972 gem of a Pontiac (< $1000 TOTAL parts and maintenance spent last 20 years, and paid, any DIY free work neglible). More than 20 years ago, new NTW tires went out of round after a year or 2. As in tire wear made no longer round tires. Several tire shops claimed out of balance,all redid previous shop's balance and alignment. SOLUTION: an old radiator shop mechanic listened to the symptoms, radiator shop but an overall master mmechanic. He simply put a board under spinning wheels first test, the gap narrowed and widened as the tires were no longer ROUND. Sold the tires cheap via "the thrifty nickel" magazine, to a guy using for only city driving...so didn't care... no bad vibration until about 50 mph, worse vibe with more mph. Heard then, that NTW sold cheap because like flawed clothing(seconds), the tires sold had flaws or poor quality. Lol, none of the mechanics who rebalanced, claimed each previous shop didn't align and balance right ...but none took a fast enough test drive. All they needed was 50 mph or especially 65 or faster to see there work FAILED to fix the vibe to shake and shimmy at speed... not like any REAL speed needed, like in late 1970's when that Pontiac would go south over 1000 miles ti hit the Fla border in less than 11 hours, including fuel stops and fast food stopNeat zero mph eating some if the 10+ nearly 11 hr trip time, before the final leg instate.