Yes, @amey's bike was designed with a slightly longer reach (brakes), so your Langster should be easy enough to convert into 650b.
Schwalbe make 38mm Marathon Plus, 35mm Kojak, and 38mm Durano E in 650b too.
All the 584mm versions are wired bead, no folders. Boo.
That's fine really, not like it'll make a massive difference to your commute/club ride/tour.
@Emyr started
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Yes, @amey's bike was designed with a slightly longer reach (brakes), so your Langster should be easy enough to convert into 650b.
Schwalbe make 38mm Marathon Plus, 35mm Kojak, and 38mm Durano E in 650b too.