Wheel size

First step is to check the size of the bicycle wheels to know which kit to order.
It's not as simple as it sounds. I've measured the diameter of the wheel (including tire): 64cm = 25,2''.
Kits are available for: 10", 16", 18", 20", 24", 26", 700C, 28". Mmmmm, not maching...
I take again the wheel, and on the tire I can read: 26 x 2.00 (54 - 559).
Well, it looks like it is a 26'', but now, I want to understand the meaning of all the numbers.
Thanks to http://www.sheldonbrown.com/tire-sizing.html I've learnt that:

• 26: diameter code of the wheel (including tire), in inches. In the past, 26'' wheels were 26'', but nowadays, there are many variants of 26'' rims and tires, and you can even find 26'' wheels that are less than 25'' in reality. I understand now why my 26'' wheel is actually 25,2''...


• 2.00: width code of the tire, in inches.


• 54: width of inflated tire, in centimeters.


• 559: ISO Bead Seat Diameter (see picture), in centimeters.

So, we know now, that we have to order the 26'' option.