Replacing front tire, need verification

[njchopper87]

I have the joy of being able to replace not only a tire, but a tube as well. I did a lot of research and now I'm ready to order. However, before I do I'd like to make sure I'm getting the right size tube. My tire size is 110/80-19. The details of the tire can be found here, and the tube I'm looking at buying is the size 2.25/2.5-19. I'm pretty sure that's the right size, but I don't know too much about what I'm looking at. The tube info can be found here.

I'm a little confused because the Metzeler brand tube has the sizes in tire size, but this brand doesn't.