Donny are you involved with these now? Is the 27/7/19 available in the hardest compound? Have they been tested with a durometer to see if they are a CD7?
Dave,
Straight from Chris on the particulars of the durometer readings see if this helps you out.
According to durometer readings I've taken in the past:
Maxxis and Goodyear CD5 read between 54-56 (A Scale)
Goodyear CD8 71-72
Unsure on a Maxxis CD3 around 40, although not a good choice for the street, in my opinion.
GoldenTyre CC4 is supposed to be at 56, although my first shipment appears to be softer than that. While DOT approved, I would not recommend for street use
GoldenTyre CC5 read 62 recommended street option
GoldenTyre CC6 read 68 recommended street option
I will say that the GT is made of natural rubber vs. synthetic in Maxxis and GY. I have found that the natural rubber of the GT's performed softer than the synthetics at an equal duro reading, but didn't show as much wear.
The above readings are for rear tires, as we decided to lower the fronts by 2 points on the duro. Front tires should read 54, 60, and 66 on the GoldenTyre.