Free 2-Day Shipping on Orders Over $50
  • Mercury Wheels X1 Carbon Boost Wheelset - 27.5+
  • Mercury Wheels X1 Carbon Boost Wheelset - 27.5+ Rear
  • OptionsMercury Wheels -
  • Detail Images - Rear
Mercury WheelsX1 Carbon Boost Wheelset - 27.5+
Sale 55% Off$989.55 $2,199.00

Item # MCW000O

Select options
  • Cancel
  • Select options
  • Black, 15x110/12x148, HG ($989.55)
  • 100% Guaranteed Returns
Item # MCW000O


The recent influx of 29er steeds imbued with the versatility to run 27.5+ wheels in the off season has opened up a new expectation for after-market, plus-sized carbon—not to mention the ever-expanding options dedicated to 3in tires. Mercury Wheels is answering the call with its X1 Carbon 27.5+ Boost Wheelset. Compared to the standard X1, the plus version bumps up the width by a massive 9mm to accommodate the extra volume of plus-sized tires. This platform allows those big tires to take on an ideal shape so riders can make full use of the increased contact patch, grippy cornering, and smooth plushness inherent in plusness.

Like the X1, the X1 Plus rims are built with a hookless bead, which makes the rim-to-tire bead connection more reliable for tubeless setups than traditional hooked designs. Burping and tire blow-offs are actually more common with hooked rims, and the hookless models demonstrate improved tire retention on-trail. By eliminating the ridge of material constituting the hook, hookless beads also enjoy increased structural integrity and durability to better weather rough terrain. We've found that mounting some tire brands can be a little tricky, but once they're on, the bead holds a tubeless setup as confidently as any other manufacturer's.

  • A carbon wheelset for plus-sized trail adventures
  • Hookless bead confidently holds a tubeless seal
  • Spoke count balances stiffness and weight
  • Wide rim provides stable platform for plus-sized tires
  • Boost axle width bolsters stiffness and responsiveness
  • Includes tubeless tape and valves
Tech SpecsWeight
Tech Specs
Rim Material
carbon fiber
Wheel Size
Tire Type
Rim Depth
Rim Width
[internal] 35mm, [external] 40mm
Brake Compatibility
6-bolt disc
Mercury MTB Disc
Front Axle
15 x 110mm Boost thru-axle
Rear Axle
12 x 148mm Boost thru-axle
Sapim Race
Spoke Count
Recommended Use
mountain biking, enduro, trail
Manufacturer Warranty
2 years

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead


Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel

What a bargain!

  • Familiarity: I've put it through the wringer

I’ve been using this wheelset for two full seasons with no problems at all. Straight as the day I pulled them out of the box. Roll great without any rim flex. Two thumbs up.

Bomber wheels!

  • Familiarity: I've put it through the wringer

Plus goodness. Nice and light with smooth rolling hubs. 1 year and counting with no issues at all. Highly recommend!

Plus Size Beauty

  • Familiarity: I've put it through the wringer

Fantastic wheels. Light as can be and it is certainly noticeable. They fit my Maxxis 2.8's wonderfully and I've been riding my preferred pressure with no concerns.
The build quality is great and the hubs have held up but I would like to invest in some King's later down the road.

Great wheelset!

  • Familiarity: I've put it through the wringer

I have about 600 miles on these wheels with no issues at all. I ride them aggressive and they stay true. You can't beat the quality of hand built in the USA. Highly recommend!

Lighten up your fat

  • Familiarity: I've put it through the wringer

Shave a bunch of weight off your 27.5+ bikepacking rig by swapping out those heavy alloy wheels for these sweet carbon ones.