Thick rubber rim strip with molded in valve to turn normal wheels to run a tubeless setup.Stan's NoTubes was established in 2001 by Stan himself. Working in his garage he thought there must be a better way to prevent bicycle flats. Using his exceptional ingenuity, he devised the No Tubes tubeless tire system, which has become the preferred method of converting a standard mountain bike wheel into tubeless worldwide. Before anyone in the industry even thought to consider the concept, Stan extended his brand to encompass tubeless rims with short side walls and his patented bead socket technology. Utilizing the same ingenuity that helped him develop the tubeless system, he has devised a line of tubeless ready rims that maximizes strengths and minimizes weaknesses. Bead socket technology allows for lower sidewall heights, increasing tire traction and decreasing the chance of pinch flats. All Stan's rims have something in common that sets them apart from all the others--exceptional and innovative design.