20 x 11 G25 Compound (4) PT1172G25 Slot.it

DWG1172 size, G compound tyres for wide and large Slot.it hub and similar wheels.
Soft rubber compound that suits most plastic and wood tracks.
These G series replace "F" Series tyres going forward, and true quite easily. 
Lathe truing can be done without causing "balling up"
Polish off with fuelite or lighter fluid for a shiny finish if your club and race rules allow it.

Approximate diameter on hubs prior to trueing

15.8mm hubs  19.9mm
16.5mm hubs  20.4mm
16.9mm hubs  20.7mm
17.3mm hubs  21.1mm