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FOX Racing Shox 34 Float 27.5 140 3Pos-Adj FIT4 Boost Fork - 2017


Item # FRS003U

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Item # FRS003U

Through the woods.

Carrying on its much discussed 2016 updates, the 2017 FOX Racing Shox 34 Float 27.5 140 3Pos-Adj FIT4 Boost Fork hits the trail with 140mm of plush travel and a Boost axle width for smooth, confident control through rough terrain. As also found in its 2016 sibling, the steerer, crown, uppers, lowers, and Float Air spring all shed weight compared to previous versions while still getting an overall increase in stiffness for a sharp, responsive ride. Lighter and stiffer always look better on paper, but you won't fully appreciate it until you feel how well it handles out in the dirt.

The FIT4 Damper's puffed out, 10mm shaft increases oil flow to the base valve, allowing the fork to ride high for quick, controlled recovery during everything from big, square hits to successive, small impacts. The 3-position Fit4 system also takes the reins from the old CTD system, changing the names from the overly-prescriptive categories of Climb, Trail, and Descend to a graduating scale covering Firm, Medium, and Open. While this change may read like an exercise in semantics, it entails a radical realignment of the 34 Float's capabilities that addresses virtually every issue we've had with CTD's damper in the past.

Perhaps the most welcome change from earlier Fit damper iterations is that Fit4 migrates the adjustable sub settings from CTD's median Trail mode to the new Open setting. Open encompasses both Descend and Trail in order to take full advantage of the fork's high ride by handling most compression duties. This makes the fork that much more relevant to all-mountain situations, combining better small-bump compliance with more confident tracking through rock gardens and rough terrain. It doesn't wallow and handling stays on point.

The Medium setting migrates much deeper into the firm side of compression than the Trail setting did, so it'll suffice in most conditions that don't require use of the big-bottomed Open setting. The Firm setting remains self-explanatory: an XC lock-out for turning on the afterburners when terrain allows. It'll likely see much less use in the new system, but we still appreciate Firm while riding to the trailhead or transitioning on fire roads.

FOX's tinkering wasn't just confined to the damper, though, as the Float air spring now omits the negative coil in favor of a self-equalizing air assembly. This is similar to the air spring chamber system that made the re-worked 36 series such a success, and its omission of a steel coil is a key contributor to the overall weight loss. Finally, a new system of spacers lets you easily temper the air shock's volume for dialing the mid stroke.

Tech Specs

140 mm
Stanchion Material:
Kashima-coated aluminum
Lower Material:
Crown Material:
Wheel Size:
27.5 in
Steer Tube Diameter:
1-1/8 - 1-1/2 in
Stanchion Diameter:
34 mm
Spring Type:
Float Air
3-position adjust
15 x 110 mm Boost QR thru-axle
Brake Compatibility:
post mount
Claimed Weight:
1,783 g
Recommended Use:
mountain bike, trail, all-mountain
Manufacturer Warranty:
1 year

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Foxin' Awesome

  • Familiarity: I've put it through the wringer

This fork… holy cow. It belongs on every mid travel bike. I know, I know, blanket statement, but I think the fork is THAT good. I used to be nervous of square edges, rock gardens, roots, ruts, and plain old crap, this thing just soaks it up. “Confidence inspiring” doesn’t do it justice.

This fork tracks where I want it to go, doesn’t feel like dead weight, and is supple. I truly feel that at every moment, this fork is setting me up to literally overcome my obstacle.

It's also so light for how capable it is! Performance/weight ratio is spot on with this guy, it doesn't mind big climbs.

With the new FIT4 damper, this fork has truly useful Compression modes and is simple an intuitive to adjust and tune. Unless you really like to geek out on suspension (I’m guilty!) the LSC, Rebound, and Air Volume adjustments are all you’ll need and are super easy to get dialed in.

And yes, I’ve ridden on a Pike. And yes I’d take the Fox. Every time.

Building a new bike? Upgrading the current whip? Give me a shout and I’ll make sure you get the perfect build.

Even if you’re not ready to pull the trigger, reach out if you have questions like:
- What do all the knobs and dials do?
- How do I set my suspension for me?
- Which fork is right for my bike?

Are the 2017 27.5 BOOST versions of this shock also Plus sized like the 2016 version which has the axle-to-crown of a 29er?

No, this fork would not have the height for 29 or the bigger 27.5 plus tires. It is an actual 27.5 fork. There is another one available that says 29/27.5plus in the title. That's what you'd be looking for