Pirelli Puncture nail in tyre

I was just getting ready to go out on the Ducati 916 and in my mind I know how tyre pressures can affect the handling so I used a old fashioned method of pushing my thumb into the tyre just to check the difference from front to back. The front seemed ok and as I pushed the back tyre in, it went soft. I pushed the bike forward and found the nail in the tyre causing air to escape. I have 120/70 zr17 pirelli angelst and 190/50 zr17angelst fitted.
It only takes a few seconds to check, even better use a guage to check cold tyre pressures before you set off.
vinnychoff