Made for bike shops, and discerning cyclists, CIRC butyl tubes are manufactured according to strict ISO9001: 2008, ISO14000 manufacturing control standards
All CIRC tubes, both Presta and Schraeder, have removable cores, making them among the easiest to use with sealant products
CIRC tubes displaying the Eco symbol are manufactured with valve stems that are lead free to comply with requirements for juvenile tubes
Are you for bikes? It’s a simple question with world changing potential. PeopleForBikes is a leading voice for uniting millions of individuals, thousands of businesses and hundreds of communities to make riding better for everyone
Defend yourself against goatheads, thorns and other sharp objects. Beefy 4mm (tire side) thickness rubber tube resists punctures.