The Specialized Tarmac SL6 Comp 2021 is a race-focused road bike that blends lightweight efficiency with all-round handling for ambitious enthusiasts and competitive riders. It delivers proven WorldTour DNA, balanced geometry, and upgrade-ready components for fast training and racing.
Specialized Tarmac SL6 Comp 2021 Design and Build
The SL6 Comp uses Specialized’s FACT 10r carbon with Rider-First Engineered layups to ensure consistent stiffness and compliance across sizes. Subtle aero profiling on the down tube and seat tube, a D-shaped 27.2 mm carbon seatpost, and fully internal cable routing through the frame create a clean, low-drag silhouette. A classic two-piece alloy cockpit prioritizes fit flexibility, while the chassis achieves impressive torsional rigidity. Typical complete weights sit in the high-7 to low-8 kilogram range depending on size and wheel choice.
Components
This Comp build is anchored by Shimano Ultegra R8000 2×11 with ST-R8020 hydraulic levers for crisp, positive mechanical shifting. Braking is via flat-mount Ultegra BR-R8070 calipers paired to 160/140 mm Center Lock rotors, delivering firm bite with refined modulation. Wheels are DT Swiss R470 Disc alloy rims on thru-axle hubs (12×100 / 12×142), offering dependable durability and predictable handling. Specialized Turbo Pro 700×26 mm tires with Gripton compound aim for low rolling resistance and confident grip in varied conditions.
Performance and Ride Quality
On the road, the SL6 Comp feels lively under power, thanks to a stout bottom bracket area and efficient tube shapes that translate effort into forward speed. The frame’s aero touches help at race pace without compromising crosswind stability. Ultegra’s precise indexing keeps shifts accurate under load, and hydraulic discs inspire confidence on wet or technical descents. Geometry delivers quick but controlled steering, while the carbon layup and slim seatpost add seated compliance to reduce fatigue over long efforts.
Aesthetics
The SL6 Comp presents a timeless race-bike silhouette with restrained aero cues and minimal hardware on display. Paint schemes typically use clean finishes and discreet branding, while the tucked routing and D-shaped post emphasize integration. The result is a sleek, purposeful look that remains contemporary and unmistakably Tarmac.
Considerations
The racy fit—low stack and longer reach—benefits flexible riders but can be demanding on endurance days without careful setup. Alloy wheels favor robustness over outright lightness and aero gains; upgrading to deeper-section carbon rims can unlock more speed. Mechanical Ultegra remains highly reliable, though riders seeking effortless shifts might prefer an electronic drivetrain.
Overall Impression
Overall, the Specialized Tarmac SL6 Comp 2021 is an excellent all-rounder for fast group rides, hillier races, and spirited training. It combines sharp handling, dependable components, and a proven chassis with clear upgrade paths. Riders who value precision and efficiency will appreciate its race-first manners—provided they’re comfortable with a purposeful fit and plan future wheel or drivetrain upgrades.
Specialized Tarmac SL6 Comp 2021 pros and cons
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Specialized Tarmac SL6 Comp 2021 Specs
FRAMESET
Frame: Specialized Tarmac SL6 Comp, FACT 10r Carbon, Rider-First Engineered, OSBB, flat-mount disc, 12×142 mm
Fork: Tarmac SL6 FACT Carbon, 12×100 mm thru-axle, flat-mount
Seatpost: Specialized Tarmac carbon D-shaped 27.2 mm, 20 mm setback
Headset: Integrated 1-1/8"–1-1/2" bearings
DRIVETRAIN
Shifters: Shimano Ultegra ST-R8020, 2×11
Front Derailleur: Shimano Ultegra FD-R8000, braze-on
Rear Derailleur: Shimano Ultegra RD-R8000 GS, 11-speed
Crankset: Shimano Ultegra FC-R8000, 52/36T
Bottom Bracket: OSBB PressFit (Shimano-compatible with adapters)
Cassette: Shimano Ultegra CS-R8000, 11-30T
Chain: Shimano HG701 11-speed
BRAKES
Calipers: Shimano Ultegra BR-R8070, hydraulic disc, flat-mount
Rotors: 160 mm front / 140 mm rear, Center Lock
WHEELS & TIRES
Wheels: DT Swiss R470 Disc, alloy, tubeless-ready, 24/28h
Hubs: 12×100 front / 12×142 rear, thru-axle
Tires: Specialized Turbo Pro, 700×26 mm, Gripton compound, folding
COCKPIT
Handlebar: Specialized Expert Alloy, compact bend
Stem: Specialized alloy, 6°
Bar Tape: Specialized S-Wrap
Saddle: Specialized Power, hollow Cr-Mo rails
SPEC HIGHLIGHTS
Axle Standards: 12×100 / 12×142 mm thru-axle
Brake Mount: Flat-mount disc
Max Tire Clearance: ~28–30 mm depending on rim/tire combo
Claimed Bike Weight: ~7.7–8.2 kg (size-dependent, without pedals)