Inner Tube, AV
From Amazon
Schwalbe STU038X Xtra Light Inner Tube - Black, 26 x 1.50/2.10 Inch
Halfords
Schwalbe Extra Light Bike Inner Tube, 26 Inch X 1.5 - 2.35 Inch (Av14)
OnBuy
Schwalbe Tyres: AV14 - 26 x 1.50/2.35" - Schrader (x-light 130g) - 40mm- -26 X 1.50/2.35