NOTE: We have a test available of a newer version of this tire: Schwalbe Pro One TLE Addix 2020

The Schwalbe Pro One Tubeless is a brand new 2016 model year tire; it should be available for sale later this year. The Pro One Tubeless isn't just a slightly improved version of the original One Tubeless, but an entirely new design. The Pro One is 25% lighter and now carries the Tubeless-Easy batch, this means it requires 20 ml of tire sealant to make the tire seal. Schwalbe sent me a pair of these to test; they must be certain the tires are fast!

Buy Schwalbe Pro One Tubeless at Rosebikes.de

Although the original One Tubeless (review) already has a very low rolling resistance, I was never really a fan of it. I always felt the tire was too heavy and didn't make it worthwhile to switch to a tubeless set up. Total wheel weight and rolling resistance were very close to the normal One V-Guard (review). You also lost the option to fit latex tubes (Schwalbe One comparison) to reduce rolling resistance and weight even more.

To make it possible to decrease the weight by 25%, Schwalbe now uses a MicroSkin construction. This new MicroSkin fabric is applied from bead to bead and takes care of sealing the tire at the very high pressures used in road bike tires. It also guarantees high-pressure stability and improves cut resistance. With this new construction also comes the Tubeless-Easy part and the requirement to use 20 ml of tire sealant.

Tubeless-Easy and the ability to hold air

The big drawback of using latex inner tubes is they lose air quickly and require re-inflating every day. Because the original One Tubeless had a thick butyl layer on the inside of the tire, it held air just as well as standard inner tubes. I have monitored the air pressure of the new Pro One with 20 ml of sealant over a 48-hour period, and it dropped from 110 psi to 100 psi. It's possible it starts to seal a bit better after a few days. I will update this article when more data is available.

Update: After monitoring air pressure over a seven day period, it seems the Pro One Tubeless started sealing a little bit better. These measurements were taken after several tests and remounting the tire three times. I've also upped the amount of sealant to 30 ml. See table for results.