rolling radius

[RobThomas]

Now, I tried the search function but didn't find what I was looking for.

What is the rolling radius of a 5.20/14 on a Minor 3.5 inch rim against, say, a 165/80/14? Has anyone got a website link for a tyre size converter that understands crossply sizes?

Thanks

[beero]

You may find something on here, don't know if their converter does crossplies though
http://www.carbibles.com/tyre_bible.html

[RobThomas]

Thanks. I've tried that one before but there isn't info on 5.20x14 so I have no starting figure. Using the "sitting 2 wheels next to each other" scientific method I have decided that the 165/80/14s on the 5J rims are about 12mm taller in diameter. I'd like to find a suitable tyre with about 8% more truns per mile to suit the car than the 5.20s

[mike.perry]

I believe that the aspect ratio for cross plys is 88% compared to 80% for a normal profile radial, ie 145 or 155 x 14.
A 175/80 x 13 has a very similar rolling radius to a 155/80 x 14.

[RobThomas]

The bit I need is the rolling radius for 5.20x14 so that I have a start figure for comparison or even the tyre size known to have the same figure but in a radial size.

Has anyone got such a piece of info?

[Kevin]

Rob I would think that these people should be able to answer your query, even if it means physically measuring a tyre for you.
http://www.vintagetyres.com/

[katy]

http://www.turbinecar.com/tires.htm