Tested in races, the system has already proven to be very reliable: For example, athletes using the system took three medals at enduro and downhill races in Scotland in recent weeks, including Sam Hill with a silver medal at the DH in Fort Willam.

The outer chamber is a tubeless system, while the inner chamber consists of a special tube. This means that the outer system can be ridden with just one bar of pressure. The inner system maintains a pressure of between four and six bar. Even if the inner system collapses, the outer system will not explode as it carries more volume. Even if the inner chamber loses all its air, the inner system will keep the tire on the rim. For the time being, Procore will only be available in the Gravety and Allmountain range.

A small disadvantage is that the system currently weighs just under 200 grams, but the advantage is that you can also ride lighter tires with this system, but the tires should be tubeless-ready.

Procore can be used on all rim and tire systems. Schwalbe and its development partner Syntace are therefore not limiting the Procore system to their own products. The only requirement is an inner rim width of 23 millimetres.

Not the easiest installation

Using the Procore system is not easy: As Procore requires two holes for the two valves, a second hole must be drilled into the rims. Schwalbe is in talks with all rim manufacturers, but it will be a while before every manufacturer can confirm that a second hole can be drilled in the specific rims.

First driving tests show that the system does not solve the problem of the tire "rolling" at very low pressure. The low pressure of the tire creates outstanding traction, which definitely speaks for the system.The price for the entire system is estimated by Schwalbe at around 150 euros. However, the definitive price will probably not be announced until the official presentation of the Procore system at Eurobike 2014.