In-depth review of the Specialized S-Works Tarmac SL9: testing the claimed 4-watt aero saving, climbing agility, pros, cons, and whether it justifies the $14,000 price tag.
THE BOTTOM LINE: The Specialized S-Works Tarmac SL9 arrives as the flagship race machine for the professional peloton, reaffirming Morgan Hill's single-bike philosophy for both flat sprinters and mountain climbers. Claiming a 4-watt aerodynamic saving over the SL8, this flagship build comes with a staggering $14,000 / €13,999 price tag. We put it through its paces on our benchmark testing routes to determine whether this surgical refinement is worth the investment.
Technical Specifications & Test Measurements
Frame Material: S-Works FACT 12r Carbon with a claimed frame weight of just 687 grams.
Tested Weight: 14.33 lbs (6.50 kg) in size 54 (without pedals)—among the lowest figures in the aero-race category.
Groupset & Drivetrain: 12-speed Shimano Dura-Ace Di2 (or SRAM RED AXS) featuring an integrated dual-sided power meter.
Stock Wheelset: Roval Rapide CLX III Tubeless-ready carbon wheels with a wide internal rim profile.
Tire Clearance: Capped strictly at a 32 mm maximum.
Aerodynamic Claim: 4 Watts saved at 28 mph (45 km/h) compared to the SL8 (~28 seconds saved over a 62-mile/100-km stage).
Bottom Bracket Standard: Threaded BSA68 (rock-solid reliability and easy home maintenance).
Ride Impressions: On-Road Performance
Climbing Performance: At just 14.3 lbs (6.5 kg), acceleration out of the saddle on double-digit gradients is instantaneous. The threaded BSA68 bottom bracket transfers raw power without a hint of flex.
Descending & Cornering: The front end provides surgical precision. A rigid, unyielding fork cone allows you to dive deep into apexes and brake late with total composure, even over broken pavement.
Flats & High-Speed Sailing: The 4-watt aerodynamic advantage manifests as an ability to hold 25+ mph (40+ km/h) cruising speeds with less effort, aided by the inertia of the deep-section Roval Rapide wheels.
Pros & Cons
PROS
Exceptional Responsiveness: A stiffness-to-weight ratio right at the pinnacle of the market.
Clean Cockpit Integration: Internal routing provides pristine lines without making routine maintenance overly complex.
Handling Precision: Rock-solid, direct front-end tracking through high-speed corners.
Narrow Hood Geometry: Reduced handlebar width at the hoods encourages an aerodynamically efficient rider body position.
CONS
Restrictive Tire Clearance: The 32 mm clearance limit feels narrow compared to competitors accepting up to 35 mm tires for rougher roads.
No Spec Customization: On a $14,000 bike, you cannot select crankarm length or handlebar width at the point of order.
Prohibitive Price: A price point that pushes it far beyond the reach of most amateur riders.
Head-to-Head: Tarmac SL9 vs The Competition
VS Cervélo S5: The Cervélo edges it out in pure aerodynamic efficiency on flat terrain, but carries a weight penalty when the road tilts upward.
VS Canyon Aeroad CFR: The Canyon delivers a nearly identical performance package while saving you roughly $4,000 at checkout.
VS Specialized Tarmac SL8: The performance leap of the SL9 is real but incremental. For current SL8 owners, the upgrade is far from mandatory.
The Verdict by Cyclonline.com
The Specialized S-Works Tarmac SL9 re-establishes itself as the ultimate benchmark for racers seeking maximum performance without sacrificing weight for aerodynamics. It remains the dream rig for professionals and well-funded riders who demand the absolute peak of cycling tech. However, for those already riding a Tarmac SL8, the 4-watt gain alone does not justify trading up to the new frame.