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.
|1mm wall thickness||708752064430||TU0003|
|1.3mm wall thickness||708752034433||TU0002|