I've had one out of two Schwalbe Supeme in 20"x 1.6" with a totally objectionable hop. One out of four 700c x 35 mm Supremes had a tolerable hop that was noticeable in smooth roads. Seems to be an issue where casing overlaps. They are good tires but the standard for trueness is not any where as good as Panaracers that cost half as much.