Wheel size - 622 x 15c

superkenners

Bought a set of Fulrcum 3's and sizing on the wheel says 622 x 15c which has thrown mew somewhat, is this the same at 700c? or is there a subtle difference?

andrew_s

Yes, it's 700c, the same size as an Open Pro.

622mm is the diameter of the bead seat, 15mm is the (internal) width.
A 700x25c tyre will also have an ISO size written on it, as "25-622" - a bead diameter of 622mm and a tyre width of 25mm.

Bead diameters must match, tyre widths are best between rim width + 6mm and 2x rim width, more or less.

700mm was the overall diameter of the rather fat tyre that the 700c size of rim was originally for.

superkenners

Cheers, useful info!