Ask a shop mechanic what actually ends a carbon XC wheel’s life and the answer usually isn’t the rim cracking. It’s the one proprietary spoke nobody stocks, the bonded hub joint that turns a single broken spoke into a dead wheel, the freehub standard that needs a part shipped from the brand’s warehouse instead of pulled off a shelf. On October 22, WTB launched the CMR Light i30 — a carbon XC wheelset claiming 1,300 grams for the pair — and built it around the boring, repairable parts instead: 24 conventional spokes, a freehub body that comes apart with normal tools, a rotor mount every shop already stocks pads and rotors for. The weight number gets the headline. The spoke count is the spec that matters once the wheel’s a year old.

Two days old as of this post. Worldwide Cyclery’s first ride put one on a scale and got 1,309 grams — close enough to WTB’s claim to take seriously — and reported snappy climbing and surprising stiffness on the trail. That’s one wheelset from one outlet, not a verdict, and most of the field is still waiting on finished retail units to log real trail hours of their own.

Quick Take

Claimed weight	1,300g pair (609g front / 691g rear), tape and valves installed
Rim	30mm internal width, asymmetric hookless carbon, 4D spoke drilling, 29in only
Spokes	24 front / 24 rear, Boost spacing, CenterLock rotor mount
Hub	Frequency 7X — DLC-coated ratchet, splined (not threaded) ratchet interface, 10° engagement, larger Enduro bearings
Freehub options	SRAM XDR or Shimano Micro Spline
Price	$850 front / $950 rear / $1,800 as a set
Warranty	Ride With Confidence Guarantee — free carbon rim replacement for the original owner
Launched	October 22, 2026
Best for:	XC racers who want sub-1,300g wheels without buying into a hub they’ve never heard of
Skip if:	You want independent durability data before spending flagship money

The Weight: 609g Front, 691g Rear

Start with the number WTB is actually selling. 609 grams for the front wheel, 691 for the rear, 1,300 total — with the TCS tubeless tape and valves already installed, not added after the fact to make a lighter number look better on a spec sheet. That’s a real, usable claimed weight, not a bare-rim figure with the rest of the wheel left out of the math.

Is it the lightest thing in this category? No. Pinkbike’s launch coverage points out the obvious comparison: Berd’s Hawk30 Gold and Roval’s Control World Cup wheels hover closer to 1,000 grams. WTB isn’t chasing that number. It’s chasing the number that sits a few hundred grams heavier and comes with a hub nobody’s calling fragile — which, if you’ve paid attention to how often ultra-light XC wheels end up getting quietly discontinued after a season of warranty claims, is a more interesting bet than shaving another 150 grams would have been.

What’s Actually New: the Frequency 7X Hub

Here’s the part of this launch that matters more than the rim. Lightweight race wheels usually get there by cutting something riders don’t notice until it fails — thinner rim walls, fewer spokes, smaller bearings, a ratchet mechanism built for low weight instead of high torque. WTB built a new hub specifically to avoid making that trade, and it’s the piece of this wheelset actually worth some skepticism before you take the marketing at face value.

What makes the Frequency 7X hub different?

1. DLC-coated ratchet. The ratchet ring gets a Diamond-Like Carbon coating, which WTB and road.cc both describe as harder and lower-friction than a standard chrome-plated ratchet. DLC coatings are an established trick in other high-wear mechanical contexts — it’s not an invented technology, just not one you usually see on a hub this light.
2. Splined ratchet interface instead of threaded. The inner ratchet ring attaches with a splined connection rather than threading on, which WTB claims can handle more than double the torque of a traditional threaded design before stripping.
3. Larger Enduro bearings. The bearings are sized up from what you’d expect on a wheel this light, with WTB claiming up to a 38% higher load rating per bearing compared with competitive rear hubs.
4. 10 degrees of engagement. Not the fastest engagement number on the market, but a reasonable middle ground — faster engagement hubs tend to add drag or complexity, and WTB isn’t claiming a speed record here.

WTB put two numbers on paper that a hub failure can actually be checked against later: more than double the torque capacity of a threaded ratchet interface, and up to 38% more bearing load capacity than competitive rear hubs. That’s more than most wheel launches give you to go on. It’s also entirely WTB’s own testing — nobody independent has put a torque wrench or a durability rig on a Frequency 7X hub yet, so those percentages describe a design margin, not a warranty record. The engineering logic checks out on paper. Whether it holds up past one race season is a question WTB’s own press release can’t answer, no matter how specific the numbers sound.

How It Stacks Up Against the Rest of the Field

$1,800 for a 1,300g carbon wheelset isn’t a budget number, but it’s not the top of this category either. Here’s where it sits against the other XC race wheels we’ve covered this year:

Wheelset	Weight (pair)	Price	Notable
Mavic Crossmax Ultimate	1,080g	$3,049	Lightest here, ceramic bearings, debuted at a World Cup race
WTB CMR Light i30	1,300g	$1,800	DLC-coated ratchet, no-questions-asked rim replacement
CADEX Max XC	1,248g	$4,000	Bonded carbon spokes, no field-replaceable hub-side spoke
Race Face Era SL	1,530g	$1,649.98	Conventional carbon build, cheaper than the WTB
Reynolds A275	1,520g	$449	Alloy, not carbon — the budget alternative if 1,300g isn’t the point

Line it up this way and the WTB’s pitch gets clearer: it’s 220 grams heavier than the Mavic for $1,249 less, and 230 grams lighter than the Race Face for $150 more. It’s not winning on any single axis. It’s splitting the difference between “lightest available” and “cheapest carbon available” while adding a hub story neither of those wheels is telling. Against the CADEX, the comparison is almost unfair — the Max XC is chasing stiffness and rock-strike resistance at double the WTB’s price, with a spoke-to-hub bond you can’t field-repair. The WTB’s conventional 24-spoke build, with a CenterLock rotor mount and a replaceable freehub body, is the more serviceable wheel of the two, which matters more to someone paying their own bill than it does to a World Cup team with a spare bike in the pit.

Freehub Options and Fit

The CMR Light i30 ships in SRAM XDR or Shimano Micro Spline freehub bodies, standard Boost spacing (15x110mm front, 12x148mm rear), and it’s 29in only — no 27.5in option, which tracks with this being a dedicated XC race wheel rather than a general trail build. CenterLock rotor mounts across the board, which is a meaningful departure if you’re coming off a six-bolt wheel and need to budget for new rotors, not just a new wheelset.

That’s a conventional, serviceable spec. No proprietary spoke, no bonded joint, no new freehub standard to relearn — the kind of build where a shop can actually true it or replace a spoke without calling WTB first. Compare that to CADEX’s approach, where a bonded hub-side spoke means no field repair exists at all. WTB went the other direction, keeping the parts of the wheel that fail most often — spokes, freehub body, bearings — in a form a mechanic can actually service.

Pricing: $850 / $950 / $1,800 — Worth It?

Buying the set at $1,800 saves you nothing over buying the wheels separately — $850 plus $950 is exactly $1,800, which is a cleaner pricing structure than most brands bother with. It also means there’s no real penalty for buying just a replacement front or rear if that’s ever the piece that needs swapping, which pairs well with the rim-replacement guarantee WTB is offering.

That guarantee is the detail I’d weigh almost as heavily as the weight number. WTB’s Ride With Confidence program replaces the carbon rim for the original owner if it breaks while riding — no stated mileage cap, no “defects only” fine print mentioned in the launch coverage. Reynolds built its entire alloy wheel pitch around a similarly generous warranty, and it’s worked because riders actually test it. A lightweight carbon XC rim is exactly the kind of part that benefits from that promise existing, since carbon doesn’t bend before it cracks the way alloy does. Whether WTB honors it as cleanly as advertised is something only a season of real rim strikes will answer.

Who Should Actually Buy This

Riders who want a serviceable wheel, not a boutique one. Conventional 24-spoke lacing, a replaceable freehub body, standard CenterLock rotors — if your local shop needs to true this wheel or swap a spoke, they can, which isn’t true of every wheel on the comparison table above.

XC racers who want sub-1,300g wheels but don’t want to gamble on an unproven hub brand. Frequency 7X is new as a name, but the engineering behind the DLC ratchet and the larger bearings is a reasonable bet on paper, and the rim-replacement guarantee gives you a backstop if the carbon doesn’t hold up.

Anyone cross-shopping the Race Face Era SL on price. At $1,800 for 230 fewer grams than the Era SL’s 1,530g, the WTB is the better weight-to-dollar trade if you’re already spending Era SL money.

Who Should Skip This

Anyone chasing the absolute lightest number. The Mavic Crossmax Ultimate is 220g lighter, and Berd and Roval’s lightest spoked builds get closer to 1,000g, per Pinkbike’s launch coverage. If grams are the only variable, this isn’t the wheel that wins that argument.

Riders who want independent testing before trusting a new hub’s durability claims. WTB’s torque and bearing-load numbers are the brand’s own figures. Nobody outside WTB has run a Frequency 7X hub through a season of XC racing yet, and “more than double the torque capacity” is a claim about the mechanism’s design margin, not a guarantee about how it ages.

Budget-conscious riders who don’t need carbon at all. Reynolds’ A275 gets to 1,520g in alloy for $449 — $1,351 less than the WTB set, with a similarly generous warranty story, if 1,300g specifically isn’t the thing you’re buying.

The Bottom Line

WTB didn’t try to win the weight war outright with the CMR Light i30, and that’s the right call for a brand whose reputation was built on durability, not grams. The number that actually separates this wheel from the CADEX Max XC at twice the price isn’t 1,300 grams — it’s 24 conventional spokes and a freehub body that comes apart with tools a shop already owns, against a bonded hub-side spoke that turns one broken spoke into a dead $4,000 wheel. The DLC-coated ratchet and the bearing-load numbers are real engineering claims, just ones nobody outside WTB has run through a full race season yet — worth knowing about, not worth basing the purchase on by themselves. At $1,800, with a build a mechanic can actually true and a rim-replacement guarantee behind it, this is the carbon XC wheelset for a racer who wants sub-1,300g without giving up the ability to get the wheel fixed somewhere other than WTB’s warehouse.

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Launch specs and pricing sourced from WTB’s official CMR Light i30 product page, Pinkbike’s launch coverage, road.cc, and Worldwide Cyclery’s first-ride coverage. No test unit has been ridden by our team at time of publication.