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Item # MCW000B

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  • Black, 15QR/12x142 SRAM XD ($1,199.95)
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Item # MCW000B

The last hoop.

Of all the hoops that 29ers have been forced to jump through in order to prove their worth to industry nay-sayers, wheel stiffness remains the last meaningful objection. The Mercury Wheels X1 Carbon 29in Wheelset puts that complaint to bed, clearing that final hoop courtesy of its responsively stiff carbon hoops. And while they're responsive as hell on climbs, the rims really shine while tracking across terrain. Loose, chundery, crunchy — it doesn't matter; the X1 Carbon goes where you point it without hesitation.

The rims are so stiff that Mercury is able to reduce weight by reducing the spoke count from the usual all-mountain staple of 32 to just 28 per wheel. While the spokes' two-cross pattern further increases lateral stiffness for more efficient climbing and tenacious tracking, their reduced number provides a touch of radial flex for more forgiveness on big hits. Of course, carbon rims are still obscenely stiff, which is one reason why we aren't sorry to trade the additional (and unnecessary) stiffness of a 32 spoke build for the lower weight of 28 spokes. The other reason is that fewer spoke holes mean less drilling and, ultimately, a more structurally sound rim.

The rims are built with a hookless bead, which — contrary to what common sense might suggest — makes the rim-to-tire bead connection more reliable. Burping and tire blow-offs are actually more common with hooked rims, and the hookless models also demonstrate improved tire retention on-trail. By eliminating the ridge of material constituting the hook, hookless beads also enjoy increased structural integrity — a definite plus when you consider that the X1 Carbon is built for the big hits of enduro and all-mountain riding. We have found that mounting some tire brands can be a little tricky, but — once they're on — the bead holds a tubeless setup as steady as any other manufacturer's.

Finally, note that the rims don't include tape or tubeless valves, but we've had luck installing most readily available tubeless conversion kits and wouldn't recommend running the X1 Carbon wheelset any other way.

Tech Specs

Rim Material:
carbon fiber
Wheel Size:
29 in
Tire Type:
Rim Depth:
24 mm
Rim Width:
[external] 32 mm, [internal] 26 mm
Brake Compatibility:
6-bolt disc
Front Axle:
15mm quick-release
Rear Axle:
12 x 142mm thru-axle
Sapim Race
Spoke Count:
28 / 28
Claimed Weight:
1,600 g
Recommended Use:
enduro, all-mountain
Manufacturer Warranty:
2 years

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Can you convert the this rear XD free hub body to a SRAM 10 speed or is it a 11 speed only thanks.


Hey Gavin, the Shimano/Sram option will allow a Sram 10sp cassette on it! It will fit both a 10sp for Sram/Shimano and the Shimano 11sp cassette on it. If you have any other questions on it feel free to reach out to my direct line at 801.204.4547 or shoot an email! Best regards, Connor

Carbon performance, alloy price

  • Familiarity: I've used it several times

Just like the rest of the Mercury line, the X1's give you a lot of wheel for the money. Carbon weight and stiffness with alloy pricing. These wheels are the real deal. I've just mounted these up to my Pivot Mach 429 Trail. I have enduro durability and stiffness with trail weight. The volume adding wide rim give a nice ride.

These hoops are laced up by hand here in Utah by a skilled craftsman. Mercury is a great little company that is giving the bigs fits. You won't be disappointed in these wheels. Give me a shout if you'd like to know more. btowery@backcountry,com 801-204-4557