Hiya mate
As I thought, a roofing nail (over here anyway) is between 35-50mm (1½" - 2") long.
Keep an eye on it and take it easy.
Leave those Harl*ys alone ..
As has already been said, with two wheels, things get .. interesting .. if either goes.
I wouldn't want to lose either (though I've lost the rear for other reasons ...
).
Be good mate
