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RockShox SID XX Solo Air 100 Boost (51mm Offset) Fork - 29/27.5 Plus - 2017

Sale $720.95 $845.00 15% off

Item # RSX006B

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  • Diffusion Black, 1.5T, 15x110mm Maxle Ultimate ($720.95)
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Item # RSX006B

Trail rocket.

Compared to its carbon-infused World Cup counterpart, the RockShox SID XX Solo Air 100 Boost (51mm Offset) Fork - 29/27.5 Plus features an alloy steerer and crown to bring the price into more attainable territory. It adds a hint of rake, which decreases the bike's trail to make low-speed finesse sections more manageable. The result is less "dead" space between the hub and the steering axis, which counters the squiggly, low-speed steering issues that arise from the longer trails produced by taller wheels and slack geometries. Paired with a stiff Boost axle width and Power Bulge bushing reinforcement, this fork's handling stays razor sharp at all speeds, whether climbing, descending, or deftly navigating tricky terrain.

Despite the change in materials, the SID XX includes the same top-end, race-ready Motion Control DNA damping system found in the World Cup model. Fighting off gravity and wallow is in this system's DNA, and it uses external rebound and incorporates separate circuits for low- and high-speed compression. The damping is remotely adjustable with the included XLoc remote, so you can dial it for high-riding sensitivity over consecutive bumps or larger impacts to maintain speed across flats and descents and protect the gap you worked so hard to open up on the previous climb.

The Solo Air spring is also easy to tune with a single Schrader valve, which adjusts both the negative and positive chambers at the same time, and RockShox's Bottomless Tokens, which alter the chamber's effective volume to dial in the compression curve and meet individual ramp-up preferences. Pairing all this with a Rapid Recovery valve that rebounds quickly after full impacts to prep for the next hit means you'll stay in control across root-latticed climbs and rocky descents.

  • A responsive, race-ready XC fork
  • Offset decreases trail for snappy handling
  • Alloy steerer tube and reinforced lower legs provide snappy control
  • Motion Control DNA damper dials in the lockout levels
  • Dual Position Air spring is adjustable with Bottomless Tokens
  • Includes XLoc remote

Tech Specs

100 mm
Stanchion Material:
Fast Black-coated aluminum
Lower Material:
Crown Material:
forged, hollow aluminum
Wheel Size:
29 in, 27.5+
Steer Tube Diameter:
1-1/8 - 1-1/2 in tapered
Stanchion Diameter:
32 mm
Spring Type:
Solo Air
Motion Control DNA
external rebound, XLoc remote
15 x 110 mm Boost Maxle Ultimate
Max Rotor Size:
200 mm
Brake Compatibility:
post-mount disc
Actual Weight:
Diffusion Black, 1.5T, 15x110mm Maxle Ultimate: 1690g
Recommended Use:
cross country, mountain bike
Manufacturer Warranty:
2 years

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