What size inner tube?

Cube Acid 2010 hardtail, I need a new inner tube for it. I've no idea what size to buy.
I appreciate that is probably a daft question and a very simplistic one!
Ta.
I appreciate that is probably a daft question and a very simplistic one!
Ta.
Ethernet (noun): Something used to catch the etherbunny.
Road : Pinarello FP1 | MTB : Cube Acid 2010
Road : Pinarello FP1 | MTB : Cube Acid 2010
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I think it says 2.25 somewhere on the tyre?
Road : Pinarello FP1 | MTB : Cube Acid 2010
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Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
26 x 2.11 HS367
Road : Pinarello FP1 | MTB : Cube Acid 2010
Most tubes cover a range of widths e.g. 1.75 - 2.1”. Just pick one with the correct valve type.
And it all promised so so much”
Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
Road : Pinarello FP1 | MTB : Cube Acid 2010