These are Black Smooth 17mm Outside Diameter reproduction Dinky Toys tyres with a 7mm inner Diameter.
These are the second most common Dinky Toys tyre size and will fit most of the Dinky Toys Pre-1958 range including these models and more:-
All 25-series type 2 & 3.
Regular-size Dinky trucks/wagons prior to 1948.
The 25H (250) Fire Engine.
30f Bentley Ambulance.
The six cars in the 36 series.
The small 23a racing car.
The 23b Hotchkiss racing car.
From 1947 it was fitted to the Guy trucks and vans, the Bedford trucks, and the Commer Breakdown Truck.
The 1950’s regular-size 600-series Military Vehicles had this tyre until 1958.
Other manufacturers models will take this size tyres as well.