This is Surly’s 29 x 3-inch Presta valve tube. It fits their Knard tires and is made of butyl rubber.
$13.99 - $17.00
Huge tires necessitate huge tubes, so Surly presents the Toob. Its available in 1mm or 1.3mm wall thickness and is made to fit 3- to 4-inch tires. Its equipped with a removable valve core in case you want to fill it with sealant.
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