Tube - 27.5" x 2.10-2.35" Select Valve Type & Length, 32mm or 48mm PRESTA or Regular Schrader Valve. Replacement tube for 27.5" Mountain bike, or bicycle with same tire size. MTB MTN style bike Presta or Schrader Regular Valve Type in 32mm or 48mm Valve. Each tube in it's own box. 27.5" x 2.10-2.35" Please verify valve type and length. This is the number one mistake made when purchasing a bicycle inner tube. See images in this listing.