Our goal was to make a 'tubeless' tire at this time. We also had tons of requests from our customers at NAHBS 2017. By researching the market, we put all those voices into the design. As you can see on the side of the tire, it shows the words of 'Tubeless Compatible'. On the sidewall, we use gumwall material. Since most of the people who do bike touring told us, "We have problem with a usual tire that the sidewall gets torn up easily". We know that a light tire is much more comfortable, but once you find out that it's torn up, then you won't be able to continue your journey at all. SimWorks Original color 'Peanut Butter' sidewall has high durability. - Tubeless Compatible - 27.5 x 1.5", 560g, Aramid Bead - 27.5 x 1.75" , 454g, Aramid Bead - Color: Black x Peanut Butter & Solid Black Sidewall - For compatibility with the rim, please click the size compatibility chart, and be sure to use the rim size within the applicable range. - Be aware, especially with the tubeless type. We don't recommend for use with the low sidewall rims, hookless rims, or small bead hook rims.