:(unfortunately I've been invited to go to stockton next weekdend for a play around the sand dunes and then camp on the beach , so looks like I'll miss out on an awesome trip with you and max ...arrrghh
:BigCry:
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If a tyre has no aspect ratio mentioned, is the default 80%?
That's the figure I got calculating out a 205R16 (original rangie tyre).
My memory says 85% - but I suspect it depends on the manufacturer.
The "old" imperial sizes (still manufactured so not sure "old" is the right word) were necessarily 100% for crossply tyres and remained the same for radial tyres, but again, there are almost certainly variations between manufacturers and also manufacturer's versions of the basic dimensions vary I have 7.50 tyres from different manufacturers that are different in both width and diameter by almost an inch.
John