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Item # MCW000E

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  • Black, 15x110/12x148, HG ($395.58)
  • Black, 15x110/12x148, XD ($335.58)
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Item # MCW000E

When "wide" is an understatement.

There are some virtues to the five-inch tires on fat bikes, including traction, plushness, the joy of riding not only off-road but off-trail. Unfortunately, those virtues come with the vice of a ride that feels plodding compared to a jittery, low-travel XC bike. Mercury Wheels' X3 27.5 Plus Boost Wheelset goes some way toward bridging the gap between those two extremes, combining an extra-wide footprint with Boost axles to complement today's breed of high-clearance, all-mountain framesets. These bikes tend to have aggressively proportioned rear triangles with slacked-out front ends, and the X3 27.5 Plus Boost wheels max out that dynamism with equal parts torsional stiffness and plus-sized traction. The only limit is a given frame's tire clearance.

The rims consist of all-mountain-inspired, lightweight, stiff aluminum that lives up to the trail-furniture-be-damned attitude that their efficient ride quality inspires. While alloy wheels aren't as stiff as carbon, a 40mm external width and the improved spoke bracing angle of Boost axles conspire to reduce flex while climbing and barreling through lines. This is a full 5mm wider than the standard X3 rim, and the internal width of 35mm means the Plus rims can just about swallow their skinnier counterparts. That width also lets plus-sized tires plump out to their preferred girth, allowing for a larger contact patch and lower PSI.

  • An all-mountain wheelset that maximizes traction
  • Rim width tailored for plush, plus-sized tires
  • Stiff Boost thru-axles reduce torsional flex
  • Mercury Wheels is the self-sponsored racer's best friend

Tech Specs

Rim Material:
Wheel Size:
Tire Type:
clincher, tubeless
Rim Depth:
17 mm
Rim Width:
[internal] 35 mm, [external] 40 mm
Brake Compatibility:
6-bolt disc
Front Axle:
15 x 110mm Boost thru-axle
Rear Axle:
12 x 148mm Boost thru-axle
Sapim Race
Spoke Count:
28 / 28
Wheel Bag Included:
Actual Weight:
Black, 15x110/12x148, HG: 1780g
Recommended Use:
all-mountain, enduro
Manufacturer Warranty:
2 years

Reviews & Community


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Not just for Plus tires

  • Familiarity: I've used it once or twice and have initial impressions

Just got these delivered and put them on my Whyte T-130 last night. I was running WT Minions on 25mm internal I9's and the ride just felt too squirmy and wobbly at low speeds with the rounded profile but I love the traction and larger volume of the tires. Despite everyone telling me these were too wide I decided to give them a try due to their great price, and holy s*** what a transformation. Thing handled like it was on rails, never experienced this much traction on a trail bike. Wheels and hubs seem to be great quality, with a quiet hub buzz compared to my I9's. All in all great product, even better price. They were a breeze to set up ghetto tubeless with gorilla tape. If your frame is boosted, don't let anyone tell you they are too wide. I could probably go up to 2.8 in the rear still before getting close to rubbing.

What a wheel set!!!

  • Familiarity: I've used it several times

I bought a new Scott Genius 710 PLUS and needed to replace the ho hum wheels that came on the bike. Since, I bought a set of Mercury's road wheels and really liked them I decided to see what type of MTB wheels they had. I didn't have enough $$ for a set of carbons, so their X3 Plus wheels were perfect! I pulled the trigger on them, then read this "nail on the head" review...

Which tubeless valve stem can you use on these wheels? Do you also need a rim strip?

Hi David, these do not come with the rim strips.