Will fit ,no problems with folded size. The Primos were a common choice for the Brompton back in the 90ies of last century as they were the first high-pressure tires available in Brompton size. Things changed when in 2000 the Brompton yellow and Brompton green became avaialble and even more selection since then. In Europe the Primos used to be hard to get hold of during the last years but recently became availble cheaply. Availability has not been an issue in the US (apart from the pretty tan-wall version which afaik is no longer produced). However: In terms of puncture protection the Primos are probably worse than the Kojak.