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While American wheel manufacturers play fast and loose with rim widths and layup, Mavic has held firm in its stance that safety and proven design take sole precedence over flashy trends. So with Mavic finally going full carbon with its XA Pro Carbon 27.5in Wheelset, you can rest assured that the brand would not have released it if it hadn't thoroughly vetted the design to handle the kind of trail abuse garnered alongside today's breed of hard-charging, 5-in sleds.
In typical Mavic fashion, the XA Pro Carbon wheels are shot-through with an expansive list of technologies whose ultimate aim is to increase drive stiffness without taking away from the rim's slightly compliant bump absorption— speed that privileges comfort. Or comfort that privileges speed, if you'd prefer. Ultimately, the wheels strike one of the best balances of efficiency and cushion in the trail market, and they do it while foregrounding Mavic's insistence on safety and reliability. Despite that staid approach, the XA Pro Carbon does represent a pretty drastic change to Mavic's mountain wheel philosophy, so there's a lot to cover; however, since the wheels are built with one of Mavic's first full carbon rims, that seems the most appropriate place to start.
The rims feature a lay-up that targets radial flex to balance the inherent lateral stiffness of carbon with the forgiving vertical compliance of low-profile alloy rims—or, in other words, to allow a little bit of squishy cush for gnarly runs. We like stiff wheels while hammering, but wheels that are too stiff present issues beyond just comfort. Cushion aside, the lay-up's real benefit to aggressive trail riders is that it helps maintain contact with lumpy terrain by absorbing impact through engineered flex, which means it bounces less and keeps tires glued to the dirt. That focus on traction, stiffness, and comfort is obviously well-suited to a tubeless setup, and Mavic's UST design returns with some impressive developments.
The most notable of these updates is the lack of a bead hook, which improves impact resistance by eliminating the fragile bead shelf and ensuring that structural integrity isn't compromised by post-production machining. Instead of that delicate construction, the XA Pro Carbon features 3mm of impact-resistance that compares favorably to the usual 1.2mm thickness of alloy rim walls. Eliminating the hook also reduces production costs by either eliminating the machining step or, if manufacturers are molding the bead hooks, by reducing the number of factory rejects. Bead hooks are precise constructions, and it can be difficult for even manufacturers of Mavic's caliber to perfectly stuff that much material into such a claustrophobic mold and still meet the minute tolerances that we expect from the yellow label. We trust Mavic because the brand has consistently placed rider safety ahead of mindless pursuit of innovation trends. Adopting the hookless bead inverts that model, but for the same reason: safety first.
The hookless rim has a final, counter-intuitive benefit: In addition to handling bottom-outs with stoic aplomb, the XA Pro Carbon's hookless rim actually holds the tire more securely and reduces compressor blow-offs and on-trail burps. The rim owes these properties to two features not included in rims with bead hooks: a more pronounced central channel and a pair of bead locks, not hooks. These two additions more effectively divide the duties of traditional bead hooks. The central channel centers the tire and helps it seat while inflating, and the bead locks keep the tire bead in place so it doesn't unseat during hard cornering at low PSI. We should note here that tubeless-specific tires are, among other things, less prone to bead stretching, so we recommend sticking to them with these rims.
The rim changes extend beyond the hookless construction. Instead of being hidden behind an undrilled inner wall, which made truing a pain, the spokes now thread into conventional nipples that are exposed in the tire bed. This means rim tape, which we don't mind installing (and comes already installed). The holes are drilled asymmetrically, which improves the spoke bracing angle at the flange for more lateral stiffness that doesn't hamper the rim's engineered radial flex. The spokes are also stainless steel instead of Mavic's ultralight, ultra-stiff Zicral aluminum. And that's a good thing, because steel spokes encourage that forgiving radial compliance while Zicral—which is ideal for lightweight climbing wheels—all but erases it.
The rim's ability to damp bumps is further enhanced by the two-cross lacing spoke lacing pattern, which does sacrifice a small amount of lateral or drive stiffness compared to radial spokes, but it also increases that bump compliance, requires less baby-sitting without risking spoke failure, and (most importantly) better handles the torsional load transferred from hub to rim while stopping with disc brakes.
As with its road line, Mavic demonstrates some restraint with rim width, sticking to a tire-to-rim ratio that makes sense for practical applications rather than scoring on-paper points in the rim-width arms race. A bit of lateral fold in the tire actually benefits cornering, so the vertical side walls of the latest high-volume rims aren't necessarily the best solution for flowy handling. Instead of the 30mm+ rims we're seeing crop up in droves, Mavic opts for a more modest 26mm width, which lets 2.4in tires strike a balance between the dome-like gumdrop shape of ultra-wide rims and the overly floppy lightbulb bulge off wide tires mounting on narrow rims.
- A trail wheelset that charges eagerly into all-mountain territory
- Carbon rim boasts engineered flex for cushion and traction
- Rim width lets mid-sized tires sit perfectly for flowy handling
- Hookless bead burps less and makes tire installation easier
- Freehub with two pairs of offset pawls for 7.5-degree engagement
- Two-cross spoke lacing stiffens laterally but gives radially
- Item #MAV00HQ
- Q & A
Glad I waited for Mavic!
- Familiarity: I've put it through the wringer
I have ridden wheelsets from many manufacturers over the years in both the alloy and carbon flavors, and Mavic got it right with these!
They are super responsive and stiff, but not in the beat you up kind or way that many carbon hoops have. They spin up very quickly thanks to good hubs from Mavic and the power transfer feel is up there with any carbon hoops on the market. They make riding a joy and made a nice Santa Cruz 5010 into a fast and fun bike that can compete with those XC racers but also get out on the tougher and more technical stuff that they wouldn't touch.
I have ridden them on single track and technical routes in Durango, Colorado, a Rocky XC course in NM, and the park we have here which is basically a flat course on steroids (lots of rocks, sand, and punchy little climbs, drops, etc.). These wheels have been awesome in them all. I was most surprised with them relative to climbing in Colorado. Typically my 29 inch counterparts blow me out of the water going up, but these equalized that somewhat and they aren't on beaters.
The compliance is still the most amazing part of the wheelset which is amazing for carbon. If you are all about ENVE, give these a shot as they are probably more rideable for 99% of the riders out there and will allow for a bit more forgiveness should you make a wrong decision steering or braking.
At the end of the day, these made me both faster and the ride a ton more enjoyable. What else could I really ask for?
Mavic Finally Gets Modern
- Familiarity: I've used it several times
In the XA Pro Carbon, Mavic has finally released a modern profile, hookless bead wheelset in a respectable width. While these wheels don't feature all the bells and whistles of Enve Wheels (these spoke holes are drilled instead of molded, and feature Mavic's stout ITS-4 hubs which are good but not quite DT Swiss 240), they come in at a much more palatable price point. While Mavic took its sweet time releasing this wheelset, I can tell you that the wait was worth it. I'd put these wheels up against any other on the market, they definitely at the very least hold their own if not shine.