The right tube for fat and plus rubber.Standard mountain tubes stretch badly past about 2.5" and get thin where you need them thick. The Maxxis Fat Bike / Plus tube is built at the right circumference from the start, with a 1.0 mm wall that holds up at the low pressures fat and plus tires actually run.Pick your size Wheel Fits tire width Valve 26" 3.0-5.0" Presta 48mm or Schrader 48mm 27.5" 3.0-5.0" Presta 48mm 29" 2.5-3.0" Schrader 48mm Details 1.0 mm wall thickness - fat-bike specific, not a stretched trail tube. Removable valve core on Presta - you can run sealant inside the tube. 48mm valve stem - long enough for deep fat rims. Works at both ends of the pressure range, from 5 psi float to firm hardpack. From the shopCarry one even if you&';re running tubeless. A fat tire that won&';t seal in the cold is a long walk out, and a tube is the fix that always works. If you&';re between the 27.5 and 29 sizing, measure your tire width, not your wheel - a 29 x 3.0 takes the 29 tube, a 27.5 x 3.8 takes the 27.5.Not sure what you&';re running? Bring the wheel into Midway or Heber and we&';ll match it.