Epic World Cup S-Works SRAM XX SL AXS RockShox Ultimate Flight Attendant

The Specialized Epic World Cup is a highly specialized cross-country race platform designed to bridge the gap between a hardtail and a traditional full-suspension bike. Introduced for the 2023 model year, it pairs a 110mm fork with a unique 75mm-travel rear end. The defining feature is the RockShox SIDLuxe WCID shock, which is housed entirely within the top tube and driven by a compact linkage.

Instead of relying on a remote lockout, the shock uses an adjustable negative air chamber to tune the suspension's initial breakaway force. This allows racers to bias the bike toward a rigid, highly efficient pedaling platform or a slightly more active response for rougher courses. Aimed squarely at competitive short-track and Olympic-distance XC racers, the Epic World Cup prioritizes immediate power transfer and low weight over plush comfort or trail versatility.

$12,000

Image pending

Build

Size

Stack	600mm
Reach	440mm
Top tube	612mm
Headtube length	95mm
Standover height	764mm
Seat tube length	410mm

Fit and geometry

The Epic World Cup features progressive geometry for a short-travel cross-country bike, highlighted by a slack 66.5-degree head tube angle. Because the rear suspension is designed to run with little to no sag, the dynamic ride height remains high, keeping the effective geometry very close to its static measurements. This stable platform prevents the fore-aft pitching common on longer-travel bikes, keeping the rider centered and balanced.

A low bottom bracket and short 430mm chainstays across all sizes help integrate the rider into the frame, resulting in quick, precise cornering without sacrificing high-speed stability. The reach is generous but not extreme, pairing with a relatively steep 74.5-degree seat tube angle to maintain an aggressive, forward-leaning posture for steep climbs.

At the front, the cockpit setup varies by tier but leans heavily into a race-oriented fit. The top-tier models feature a one-piece carbon bar and stem with a fixed roll and negative rise, which puts the rider in an aerodynamic crouch but offers no adjustability and transmits significant trail feedback to the hands. Across the board, the stock rigid seatpost keeps the saddle high, demanding an active, skilled rider to navigate steep descents.

Full specs

Frameset

Frame

S-Works FACT 12m Carbon, WCID suspension design, Progressive XC Race Geometry, Rider-First Engineered™, threaded BB, 12x148mm UDH compatible rear spacing, internal cable routing, 75mm of travel

Fork

RockShox SID SL ULTIMATE Flight Attendant, Ride Dynamics developed 3 position, Debon Air, 15x110mm, 44mm offset, 110mm Travel

Rear shock

RockShox-Specialized SIDLuxe WCID Ultimate, Ride Dynamics Developed, Independent negative spring, Rebound Adjust, 215x40mm

Weight

9.25 kg (20 lb, 6.3 oz)

Groupset

Shift levers

SRAM AXS POD Ultimate Controller

Rear derailleur

SRAM XX SL Eagle AXS

Cassette

SRAM CS-1299 10-52t

Chain

SRAM XX SL Eagle

Crankset

SRAM XX SL Eagle Power Meter Crankset, 170mm/175mm, 34t

Bottom bracket

SRAM DUB, BSA 73mm, Threaded

Front brake

SRAM Motive Ultimate, 4-piston caliper, hydraulic disc

Rear brake

SRAM Motive Ultimate, 4-piston caliper, hydraulic disc

Front rotor

180mm

Rear rotor

160mm

Wheelset

Front wheel

Roval Control World Cup, Mini hooked carbon, 28.5mm inner width, tubeless ready, Roval Control World Cup hub, DT Swiss ceramic bearings, Roval Carbon spokes w/ Ti end pieces

Rear wheel

Roval Control World Cup, Mini hooked carbon, 28.5mm inner width, tubeless ready, Roval Control World Cup hub, DT Swiss 180 internals, Roval Carbon spokes w/ Ti end pieces

Front tire

Specialized Fast Trak, Flex Lite Casing, T5/T7 Compound, 29x2.35

Rear tire

Specialized Air Trak, Flex Lite Casing, T5/T7 Compound, 29x2.35

Cockpit

Stem

Roval Control SL Integrated cockpit, 60mm/70mm X- 12 degree integrated stem, 8-degree backsweep, 1 degree upsweep, 760mm wide

Handlebars

Roval Control SL Integrated cockpit, 60mm/70mm X- 12 degree integrated stem, 8-degree backsweep, 1 degree upsweep, 760mm wide

Saddle

S-Works Power with Mirror

Seatpost

RockShox Reverb AXS, 30.9mm, S: 125, M/L:150, XL: 175mm

Grips

Specialized Trail Grips

Builds

The Epic World Cup lineup is concise, offering three premium carbon builds that all share the proprietary RockShox SIDLuxe WCID rear shock and a 110mm fork. The entry point is the Expert build, which features a slightly heavier carbon frame, a RockShox Select+ fork, and a SRAM GX AXS wireless drivetrain.

Moving up to the Pro model retains the same frame but upgrades the suspension to the Ultimate tier, including the Brain-equipped SID SL fork. The drivetrain steps up to SRAM X0 AXS, and the rolling stock shifts to lighter carbon wheels with DT Swiss 350 hubs.

The flagship S-Works model utilizes a lighter, higher-modulus carbon frame and is equipped with SRAM’s top-tier XX SL AXS drivetrain. This build also introduces RockShox Flight Attendant technology, an integrated one-piece carbon cockpit, and ultra-light carbon race wheels. The entire range sits at the high end of the pricing spectrum, reflecting its status as a highly specific tool for dedicated racers.

Expert SRAM GX AXS RockShox Select+

$6,700

Pro SRAM X0 AXS RockShox Ultimate

$8,400

S-Works SRAM XX SL AXS RockShox Ultimate Flight Attendant

$12,000

Selected

Reviews

Reviewers consistently praise the Epic World Cup for its immediate acceleration and climbing efficiency, noting that it behaves much like a hardtail when the rear shock is set to its firmest mode. In this zero-sag setting, the rear suspension remains rigid under pedaling forces, delivering an "undeniable pedalling efficiency that feels hardtail-like" (Escape Collective). However, this firm platform requires a significant impact to break into the travel, which can cause the rear wheel to bounce over small roots and rocks on technical climbs.

Adjusting the shock to its more active setting introduces a small amount of sag, which testers found noticeably improves traction and small-bump compliance. Even in this softer mode, the bike retains a highly responsive character that "rewards full-gas efforts" (BikeRadar). While the rear suspension handles medium to large impacts smoothly, the overall ride is decidedly firm. The Brain-equipped fork also drew mixed feedback; while it effectively resists pedal bob, some riders noted a "noticeable initial resistance" (Bike-test) when the inertia valve opens.

The bike's handling is widely regarded as precise and stable at speed, though its uncompromising race focus limits its versatility. Testers found it fatiguing on longer, rougher rides compared to longer-travel alternatives, and the headset cable routing drew criticism for allowing grit to reach the upper bearing.