Ant
In search of a source of 600 x 20's I have come across Malhotra Tyres in India.
It seems I can get a 600 x 20 10 ply tyre in a half decent tread in the UK.
But I also noticed the 800x19's. Not looked at if these are availible in the UK
http://www.messe-essen-media.de/uplo...729_anhang.pdf
See page 9