Originally Posted by Nachoman
I don't know the zefal HPX, but the road morph can easily crank a tire up to 100 psi. A blackburn frame pump can not.
I've had to release air after inflating with my Zefal. I guess I thought all pumps could get well over 100psi, so the Blackburn failure is surprising to me. They use o-rings on the plunger though, right? Horrible frame pump design right there. The rubber cup is the way to go.