They're here! The new Schwalbe Winter studded tires... in 16"/349mm - Brompton size! They'll also work on Bike Friday's Tikit and Greenspeed's GT series trikes, among other things. We have a limited number of them, and it looks like we got the last that were in the warehouse, so if you want some, come and get them!
You'll be amazed at how well studded tires work on ice and packed snow. It feels like your tires are just as connected to the road as on dry pavement. Truly amazing!