Actually haven't put them on yet, just ordered them and I will call 1st thing Monday morning to clarify. But I was the one who brought up ST and when he looked for one to order it was the D.....well, I feel bad walking away from the situation, also the price was $800 for the set of 6 out the door and if they will work OK I'd rather leave it alone than jump way up to a possibly much higher price. Just to clarify I do believe he implied the Ds were 14 ply, I'm hoping when I call I find out he said G not D but that is not how my life goes. Seems like the Es were rated just over 3000 but the Ds were like 3400, so it boils down to speed I guess?