the prototypes always tell the tail...we produced several 3d and physical prototypes for this tire (more than any other tire design we've worked on) to make sure our concepts were going to work as planned...the final design had the best balance of performance characteristics.
We're still on track for the end of the month or early next month.
I second thatNot sure what all the hurdles are for creating a tire of this size, but if you make a 4.19 version, I will be pulling out the old plastic/paypal.