After we exploded one Gatorskin 28 mm and damaged the other on PBP Audax 2011 we have not been using this brand any longer. Supreme, RIBMO, Pasella and preferable in 32 mm. Now we are trying Randonneur 32 mm on one of the tandems - very hard sides and much lower psi pressure (95) than we use to - better on gravel than the tyres we mentioned. Actually Pasella in 35 mm which we tried some years ago seemed to be good rolling, but went into pieces after probably 16 years: they had not been used much, though.