"Andy Burns" wrote in message
...
Jeff wrote:

Andy Burns wrote
Aren't twin lorry tyres linked by a pipe between the tyres? So they're
inflated as one?

The inner one usually just has a much longer filler pipe so it can be
pumped up from outside the outer wheel

That's the pipe I'd seen and assumed linked them ... seems you /can/ get
kits to link them, but that's not the norm.

Yeah, you can have central electric systems that allow you to change
the pressure in all of them at once too, but again, not the norm.