The Michelin A1 butyl inner tube is among the best road tubes in the industry.

Their tubes do not suffer from premature punctures caused by drying or suffer from valve stem problems. The A1 tube weighs 90 grams, has a smooth valve stem which will save your favorite pump and has re-enforced rubber around the base of the value.

 When a tube just has to work, Michelin it is.

Size : 700x18-23
Weight : 90grams
Valve : 36mm