Hi All,
My 75L is due for new tyres,it has 14"Hotwire rims with 195/75 tyres on them(which are not that common).
Does anyone know the original rolling diameter or circumference of the tyres to keep the speedo accurate,and so I can work out exactly what should be used,the service manual says they should be 6.00 x 15 4 PR whatever that means in todays world

The original tyres were taller than any decent affordable road tyre you will find nowadays unfortunately. I think they had an aspect ratio of 86 or thereabouts. On top of that you've dropped an inch in diameter. At least your speedo will read high rather than low.

This link may help a little, giving you similar sizes.

http://forums.aussieveedubbers.com/viewtopic.php?tid=74177&page=1#pid690354

Kevin

near enough to 25" tall for the 155/80R15.
215/65R14 are damn close.
the numbers are always a little vague so have a tape measure handy.

215s on hotwires on a 2bolt Lbug are gonna hang outta the guards just a tad.... somewhere along the lines of 2"

i wouldnt stress to much over speedo accuracy
most vw speedos after 35+ years arent terribly accurate anyway

as much as i hate to admit it about 10 years ago when i was a poor P plater i had hotwires on my bug

with 185/70s the speedo was only 5km/h too fast