32mm

Maxxis Tube Welter Weight Puncture Resistant 27.5 x 1.50-1.75 Presta Valve RVC 48mm
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27.5 Inch Bike Tubes (650b)

Maxxis Tube Welter Weight Puncture Resistant 27.5 x 1.50-1.75 Presta Valve RVC 32mm

$19.95
DT Swiss Tubeless Valve – Silver

Tubeless Tyre Accessories

DT Swiss Tubeless Valve Brass – MTB, 32mm (fits 18-25mm rims)

$34.95