Or just an optical illusion.

Johnboy, I send you a photo of my digital caliper,johnboy wrote:I vote smaller too. Mike you can buy a digital caliper/Vernier etc cheaply on ebay and they can be useful for checking these sort of measurements
Hello George,kerbside wrote:I al you can not judge by the GPW model in the 2nd photo as that is nearer the camera than the other two, as you can see that the mud guards are higher.
I have just checked three of mine with a veneer the GPW was 7.39 the SPW was 7.21 and the BPW was only 6.91, so none of them was 7.5 as listed, so I suppose it depends on the child who had them before you ran them on the carpet or the concrete to wear the wheels down.![]()
Other collectors may think differently to me, and I do not think any wheels less than 7.5mm were ever used, only on hubs were smaller sizes used.
George T.