I am king of dings, destroyer of rims. My riding lacks finesse, as the dents and flat spots in every wheel I’ve ever owned will attest. in desperation I’d even started experimenting with putting road tubular tyres inside mountain bike tyres. Then Chipps handed me this for my hardtail.
Procore is much better than my bodges because it’s been properly designed, manufactured and tested. An inner chamber, made from a something like a trainer tyre, sits on the rim at high (80 psi) pressure, locking the tyre beads in place. Your tyre sits on top, at pressures as low as 12 psi.
It’s not an entirely new idea, but Procore is the first to have shiny custom components to save weight and ease installation. It has special valves that allow you to select the inner chamber or the tyre, flexible air guides made from something sealant doesn’t stick to, and its own specific tyre levers.
Components for each wheel are clearly set out with an assortment of contrasting colours and markings, making it easy to align, install and check everything. However, the valves do consist of a whole load of nested, threaded parts which can become a bit stiff and require a little care to only unscrew or tighten the part you want to.
Once properly mounted and sealed, I set my tyres to 14psi and set off for the cruellest local rock gardens and water bars I could find.
On technical climbs, I noticed it making nadgery bits easier, absorbing bumps and maintaining grip. It is, however, draggy on road climbs at such low pressures.
But within a couple of descents I’d started riding my hardtail more like it was a big squishy bike. The sensation of the back tyre bottoming out took a bit of getting used to, but I got lairier with each new descent. Increasingly, I’d just point the bike at stuff and get off the brakes. It never lost a line.
I flatted just once: A tiny snakebite to the inner part during the second day of intentional abuse. A couple of patches applied, and it’s stayed up ever since. And recently, my GPS has shown unsurprising results: slightly slower climbs; much faster descents. I’ve settled on 17psi for my weight and bike, and the effect it’s had on my riding is absurd. I fear less and brake less. Sometimes I feel the back tyre bottom out, but it doesn’t roll over in corners. Rocky trail problems become things to fly over, and I hadn’t realised just how much I was holding back.
Six months on, I’ve poked at its limits, crashed a bit, and am back in a place where I want to work on technique. I’m certain it’s saved me a bunch of pain and anguish. I used to flat about once a week, but I’ve not flatted in six months. A minor ding has mysteriously appeared on my front rim, but whatever did it, it didn’t interrupt the ride.
Update: Since publication of this review, it’s been drawn to our attention that the inner chamber works at higher pressures than recommended for some mountain bike rims, particularly carbon ones. If in doubt, please check with the manufacturer of your rims.
If the extra 200 grams per wheel bothers you, you’re probably not the kind of rider who thrashes their bike through rock gardens hoping for the best. But if you’re from the winch and plummet crowd and you just want to go faster, Procore is probably for you.
This review was first published in Issue #101 of Singletrack Magazine. Interested to see what other tubeless inserts are available and how they perform? Check out all of our tubeless insert reviews right here!
|Tested:||by David Hayward for Six months|
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