Zipp developed the AXS Smart TPU Tube specifically for their wheels, but the technology inside applies to any road setup where you want the weight savings of latex without the maintenance headaches. TPU construction drops significant grams compared to traditional butyl—we're talking 38 grams for the 700x28-40mm version—while holding air far longer than latex tubes that need topping off before every ride. The material also rolls measurably faster than butyl, putting it in latex territory for efficiency without the pressure loss overnight.

The "Smart" designation comes from an integrated NFC chip that ties into the SRAM AXS app ecosystem. Scan the tube with your phone and it logs into your component library, tracking installation date and mileage. Whether that matters to you depends on how deeply you're invested in the AXS ecosystem, but the performance benefits stand on their own regardless of whether you ever open the app. A 48mm Presta valve handles most rim depths, and the tube covers the 700x28-40mm range that encompasses everything from traditional 28mm road tires up through the wider rubber showing up on endurance and gravel-influenced road bikes.

TPU tubes do require slightly different installation habits than butyl. The material doesn't stretch the same way, so you'll want to partially inflate the tube before mounting to help it find its shape, and take extra care that nothing's pinched between tire and rim. Once seated properly, they're remarkably durable for their weight—the TPU material resists punctures better than its featherweight feel might suggest.... Read More