The idea behind Schwalbe’s Procore system is simple – use a small volume, high pressure inner ‘tyre’ to protect the rim from the inside and lock the edges of any 2.3in or larger tubeless-ready tyre in place so it can’t burp air or burst against the rim and provides a more stable ride feel too.
The price is huge for what’s essentially a tubeless kit with a couple of unique dual-position-valve inner tubes and inelastic Procore liner ‘tyres’, but as long as your rims are more than 23mm wide internally and you follow the instructions exactly, setup is simple.
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The next bit is more tricky, because the system is incredibly sensitive to pressure changes. Just 5psi can separate a tyre that feels normal in terms of roll, grip and cornering shape from one with a flaccid, mushy footprint that gives amazing grip and rollover in rock or root-infested sections but stumbles in corners and fumbles lines.
To complicate matters further, the super-narrow pressure sweet spot can be anywhere from 10 to 25psi, depending on your riding tastes/style, rim width, the volume and carcass character of your tyres and how much pressure you run in the Procore inner (50 to 80psi is recommended, but check your rim’s pressure limit, particularly on carbon hoops).
The polar opposite of set and forget
What feels supportive and dynamic on firm, high-speed trail centre berms, turns and lips won’t get you full potential on slower, rooty, muddy, rocky off-piste trails, and on some days we found ourselves changing pressures every run depending on which way we were heading down the hill. You’ll likely need to change your suspension rebound settings to reflect the bouncier ride too, and the Procore pressure will actually squeeze some wheels enough to make their spokes baggy and turn accurate tracking noticeably approximate.
You can read more at BikeRadar.com
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