Can anybody make sense of this tyre size?

[Nans_Micra]

I've got a set of alloy wheels belonging to a datsun 280zx I was just wondering what does 200/65HR370 mean on the side of the tyres? The '200' is the width but what does '65HR370' stand for? I know they are tubeless runflats and they are very old, probably more than 30 years old by now!

Any thoughts?

 

[Hyundai]

14 Inches.

The 65 is the Aspect Ratio. I *think* the 'H' is the rating for the speed these wheels can tolerate. Which I believe is 130MPH. The 370 could be the diameter?

 

[jowley]

there a 200/65/14.5 i belive i think the 370 is mm instead of inches