"Bsd Donnastreet Tyres The Donnastreets are BSD''s new tyre, based on the same proven rubber as the popular Donnasqueak tyres but with an all over smoother tread for more grip and sidewalls which sit further round the side of the tyre wall for better grind performanceà. - Smooth centre for low rolling resistance - Extra grippy & super squeaky compound - Tear resistant silkworm casing - Rated up to 110 psi - Weight :á2.3"" û 690g, 2.4"" û 730g"