Conti Road Attack Markings

After 2 unsucessful email tries to Continental, I'm turning to the forum for help.
I'm about to install a new set of Conti Road Attacks and need info on how to determine the light point on these tires.
This is for balancing purposes to keep wheel weights to a minimum.
The only mark I can find is a yellow number 56 printed on the rear tire tread about half way to the center.
The front shows a yellow D3 on one side wall.
Question is, are these marks to show the light point or heavy side of the tire or do they have nothing to do with balance?
I did mount a set of Road Attacks on my son's SV using the yellow marks as the light point but ended up using a good bit of lead to get them balanced. Could it be the yellow mark is actually the heavy point?

When I had mine, I used it as the light point. Had a frick'n pound of lead on it. My friend was soooo sure of this. LOL. Use it as the heavy point. (180 from stem). :thumbsup:

This is intersting.

I've heard the yellow dot or whatever color marking it may be, is to be lined up with and opposite of the valve stem (or the heavy spot of the rim).

A little search on the internet suggests it is meant to by lined up with the heavy spot, as the dot indicates the light spot of the tire. Then I found a PDF from a tire manufacture that says to line it up with the vavle stem (as the generaly consensus usually is), and it you are installing excess weight, break the tire down and rotate 180 degree and re balance. What a farce!

Here is the site that reference first one way and then the other.

http://www.sumitomotire.com/catalogs/pdf/T...etin6-26-06.pdf