We’ve been looking around for tires for Devon’s 3D printed wheel centers and for my EBT 4-6-0 kit. Slaters in the UK has expanded their range into gauge-3 which is quite close to our Fn3. They also make gauge-1 (1/32nd scale) and 16mm scale (1/19th scale 2’ gauge) wheels. https://slatersplastikard.com/wheels.php
(Gauge-3 is 1/22.5 standard gauge, or 64.5mm gauge. The Brits seem to like it - you can even get a live steam 4-6-2 to run.)
I was looking for a 48" diameter driving wheel with 12 spokes. Slaters sell a gauge-3 4’ 6" 13 Spoke Driving Wheel for a UK loco, which works out to the equivalent of 48.314" in Fn3. So I ordered a wheelset with a gauge-1 (45mm) axle instead of the usual g-3.