This is the Advance Brompton front wheel, suitable for the P and T Line Bromptons.

Double wall lightweight rim version of the wheel - introduced by Brompton at the beginning of 2022 with the early P Line bikes and as used on the T Line bikes The rim is the straight drilled hole version, with 20 double butted spokes and an aluminium hub with sealed bearings and axle which is undone using an Allen (Hex) key.

The Brompton front wheel size is 16 x 1 3/8 - ISO/ETRTO 37-349 (although really that's the default tyre size - the wheel takes tyres with a diameter 349mm).