25x1 (25-559) tyres and tubes.

Hi All,

So, just got a new bike for my Son, a Frog 70 Team Sky: 

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Now trying to find some suitable inner tubes, but struggling.

The tyres and tubes are marked as 25x1 25-559

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I just can't seem to find any inner tubes of that size online anywhere.  Can anyone suggest somewhere to get them from?

 

The bike also came with some cyclocross tyres, marked as 26x1.35 (35-559)

 

I'm confused as to why both have diameters of 559, but the cyclocross tyres also say 26"....The wheel diameter, without tyres, appears to be 559mm.  The tyre diametere appears to be 25".

Thanks!

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