My old bike had 27"x1 1/8" tires on it and they were in bad shape. I replaced them with some bell tires which were sized for 27"x1 1/8 and 27"x1 1/4" amd 27x1 3/8". These new tires were out of round by atleast 3 to 4 mm. Now when I ride on pavement I get a bump on every rotation of the wheel.
How do I fix this? Do I need to buy a tire for size 27"x1 1/8" only? Is there some trick to putting a tire on the rim to get it centered better. Any suggestions including what brand tire to buy will be appreciated.