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We first reported on Schwalbe's dual-chamber tire/tube system in February, and we speculated that it would be something similar to the Tubliss solution already in use in MX. Today, Schwalbe is sharing a bit more information ahead of the formal launch which is scheduled to take place at Eurobike in August. Not a minute too soon, if we believe our forum members...

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The new system is called "Procore", and as we reported previously, it is based on an inner core that runs very high pressure (55-80 psi) to help the tire keep its shape and protect from snakebite and rim dents. This in turn allows you to run a standard tubeless tire (any tubeless tire from any manufacturer will work) at much lower pressure than usual, without the risk of burping or getting squirmy under heavy load. Apparently, testers have been perfectly happy with tire performance down to 14 psi.

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The Procore system requires a rim with a 23mm internal width, which also has to be strong enough to deal with the high pressures of the Procore. Schwalbe is negotiating with a number of rim manufacturers already, and we'd expect several rims to be readily available by the time Procore launches. There should be nothing stopping you from drilling a second hole in a wide enough rim from any reputable manufacturer in any case...

Battle-proven already. Nico Lau rode the Procore to victory at the Tweedlove EWS round.

The Procore weighs about 200 grams per wheel, but Schwalbe says you can get away with running much lighter tires than usual due to the higher degree of inherent puncture protection in the system. In any event, with the amount of punctures wreaking havoc in the races recently (EWS Valloire, World Cup DH), we think racers will be more than keen to drag the extra weight around if it means better grip and less punctures. Procore reportedly also provides excellent emergency running characteristics, in other words, you won't have to ride the rim down in the event that you do end up with a flat. Gwin might be scooping up a set or ten of these soon...

Sam Hill certainly looked like he was enjoying every bit of that extra grip in Fort William.

Procore is a joint development between Schwalbe and Syntace, but the system will be marketed and sold by Schwalbe. It is expected to be available in all three wheels sizes around January 2015, and the price will probably be around EUR 150 per set (two Procore systems). We'll report back on how the system performs in real life as soon as we can get a little ride time in on it!

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