There is 20 vents with internal channels too

the Rimpact EDH is engineered for durability and resilience

comfortable package

and tighten

Maxxis Welterweight Tube - 700c - Schrader - 33-50c - 48mm Do Not Ship Internationally There is 20 vents withRide with confidence! Maxxis Welter Weight tubes are engineered for aggressive riders who require durability in their inner tubes. Be sure to keep a few spares on hand! Who's this item for: Aggressive riders who want a tube with good puncture resistance without the extra weight of a DH tube. Removable valve core: Yes, the valve cores are removable. Tube wall thickness: 0. 80mm Weight: 26 x 2. 2 2. 5: 212g 27. 5 x 2. 2 2. 5: 223g 29 x 1. 9 2. 35: 178g