RichardB
Slightly retro
- Location
- West Wales
For those who appreciate quantative analysis, the relevant diameters are 18mm and 27.5mm.
Interestingly (or not, but this IS Cycle Chat) bitd a farthing/halfpenny is/was 20mm and 25mm.
Still 'all in the mind'.
One of the unexpected advantages of decimalisation. Post-71, a frightened person's orifice widens by 53.8%, whereas before it was only 25%.
A trick the 'metric martyrs' missed, I feel.