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B'TWIN RIVERSIDE 100 HYBRID BIKE inner tube

Hi, I bought this bike 2 weeks ago and I have already a flat tire...

What size are the inner tubes?

The information of the deathlon says: Wheels 28'' (21-622) and Tyres 700 x 1.75 (47-622).

 

I looked it up and 21-622 is 26'' so I don't know what inner tube to buy... help

 

thanks

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