Ball bearing measurements question

I was looking at an ebay item and in the title I can read
6809-2Z ZZ
45 x 58 x 7 mm

Nothing strange here. But when I read the description of the item, I find:
D (Outside) 45 mm
d (Inside) Bore 58 mm
B (Width) 7 mm

I don't understand why the bore is bigger than the outside.
I would expected to find this:
D (Outside) 58 mm
d (Inside) Bore 45 mm
B (Width) 7 mm

Can someone explain me if I don't fully understand something? because I've found the same doubt with other ball bearings from china.

Its a typo... The bore is 45mm

Thanks Ian,
I was very skeptic about the measurements.

My SKF dogalogue says that a 6809 is a 45mm bore too.

Thank you.