I would not trust their info, I have rollers that spin 30 ft but I have seen types of tumblers able to drop further - they do not spin as fast but they can fall sometimes 50 - 100 ft before stopping. Also I have bred rollers that can only spin once or twice so you cannot differentiate the breed based on the number of spins they do."Roller pigeons and tumbler pigeons differ in the number of flips they will preform while flying. Tumblers will turn only one or two flips at a time, while rollers will preform many at once. At times, rollers will preform so many flips that they will look like a ball of feathers rolling through the air."
taken from the pigeon nest online.. google search.