Tern Bicycles on Twitter: "A friendly reminder for those living in cold and snowy places: the Schwalbe Marathon Winter Plus 55-406 (20 X 2.15) fits the GSD and the Vektron! #terngsd #ternvektron #
Schwalbe Winter - 349mm ISO (72 Studs) | 16 x 1.2" | Perennial Cycle
Amazon.com : Brompton Schwalbe Winter 16 x 1.2 Studded Winter tyre (Pair) : Sports & Outdoors