Originally Posted by
Jipe
The fsIr Spin is an old design, not available anymore,.
Many more recent folding bikes with ETRTO406 tires accept tires wider than 47mm: Bike Friday's from 55mm with fenders to 71mm without fenders, Brompton G-line 55mm with fenders...
I am not impressed with tire width per se (having 47-406 by myself); but with the possibility to have such a big cassette with so standard tire width.