No need to take that into consideration, the manufacturer allows for that. Just order a 16 X 20 bag or case and you're good to go.I was asking if the size of the case should be increased due to spur and mount sticking out from the drum
That's brilliant. I'm alarmed that it never occurred to me.I put my 20 x 14 kick in a 22 x 18 case. Yes, it's a little big, but when it's dark-thirty in the morning after a gig, I don't have to fight with the case to get the spurs to go in. What I do is turn the kick drum face up or face down, and I slip the bag over it. Works great. Takes about 5-10 seconds. Those couple of extra inches around the whole case makes a lot of difference.