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Item # RSX000F

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Item # RSX000F


We'll never forget the first time that we laid eyes on the original RockShox SID. The electric blue beauty screamed speed, a fact only bolstered by its presence on the bikes of the fastest XC racers of the day. And while the SID RCT3 Solo Air 120 MaxleLite15 29-inch fork has shed its blue hue, this 120mm fork maintains its characteristic desire to haul ass. And while we may pine after the blue paint of the past, there's no denying that the latest SID is a step forward in every sense.

SIDs have always been aimed squarely at the XC race crowd, but to achieve race-worthiness, it borrows heavily from standards that are used for burlier forks. You'll find an aluminum tapered steerer and hollow forged crown, along with a thru-axle and Power Bulges residing in this fork — just like RockShox's long-travel forks, only in a leaner package.

This SID uses RockShox's new RCT3 Motion Control DNA hydraulic damping. Three distinct settings allow you to quickly manipulate damping performance for trail conditions. Now, you have Open, Threshold, and Lock settings to choose from. Open allows the fork to swallow large hits, Threshold provides pedaling efficiency with bump compliance, and Lock provides the ultimate in pedaling efficiency.

The stanchions are low-friction, anodized 32mm aluminum tubes with sag gradients that assist in finding the perfect pre-load settings. Another detail, mentioned earlier, that helps make the SID stiff is the PowerBulges around the lower bushings. These eliminate deformation of the cast-magnesium lowers, ensuring smooth action and less bushing/ stanchion wear. Tying it all together is the 15mm Maxle Lite, an easy-to-use, quick-release thru-axle that boosts stiffness without adding any significant weight.

The SID RCT3 uses a Solo Air spring that's housed in the left leg, but don't let its name make you think that this is some friction laden air spring. The Solo Air design lets you add air to through a single Schrader valve, but it fills both positive and negative spring chambers simultaneously. A much easier setup for the plush, predictable ride that RockShox is known for.

The RockShox SID RCT3 Solo Air 120mm Maxle Lite 15mm 29-inch Fork has Black lowers and crown with a 1-1/8 to 1-1/2in tapered steerer. The lower legs have a post-style disc brake mount and are configured for a 15mm Maxle Lite thru-axle (included).

  • RCT3 damper
  • Maxle Lite 15mm thru-axle
  • 32mm stanchions

Tech Specs

120 mm
Stanchion Material:
Lower Material:
Crown Material:
Wheel Size:
29 in
Steer Tube Diameter:
1 1/8 - 1 1/2 in
Stanchion Diameter:
32 mm
Spring Type:
Solo Air
rebound, low speed compression, 3 position compression
15 mm QR
Brake Compatibility:
post mount
Recommended Use:
cross country
Manufacturer Warranty:
2 years

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Here's what others have to say...

My bike came from the factory with a 1 1/8" steer tube (not tapered). Do I need to change my headset to upgrade to a fork like this one? Is there anything else that would need to be converted?

Responded on

unfortunately there is nothing you can do to make a frame that is 1 1/8 straight fit a tappered steer tube.... I am sorry!


Great Shock!

  • Familiarity:I've put it through the wringer

Wonderful great shock, extremely light, lightest one I could find as a matter of fact. Absorbs every bump on the trail, love this shock.

I'm thinking about switching my Jet9 RDO to a trail'ish bike. I'd like to put a 120mm fork on it. Any reviews I should know about?

Responded on

Hope this isn't too late of a response to help. I have the Jet RDO with the Rockshox RCT3 SID Solo Air 120mm. I have found the fork to be great on flowing trails with occasional technical sections. Here in Colorado the trails have longer sections of technical riding and this is where the shock is lacking. Despite all different settings it responds with a rubbery, bouncing, too light feeling. I liked the weight and increased travel but not this particular forks handling. Yes on the 120 just not this fork if you ride/race similar type trails.

Aloha, What is the fork offset? 44, 46 or...

Aloha, What is the fork offset? 44, 46 or 51?

Responded on

Based on the vendor product number 00.4018.639.005 this should be the 46mm offset.