I put thorn resistant 20" tubes in the 406-47 Schwalbe marathon plus tires on my Bike Friday.. sealant goo in the tube, No.



thorn resistant 622-40 tubes went puncture free on long tour in Ireland & Scotland , using Nokian Utility tires , on that trip.

[ I Brought with & used used, a 3rd tire, to replace rear, a casing tear-out )