Specialized Tarmac SL8 Expert Ultegra Di2 Bike (2025)
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Specialized Tarmac SL8 Expert Ultegra Di2 2025 Road Bike. Manufacturer reference Specialized: 94925-3158
Specialized Tarmac SL8 Expert 2024 Road Bike. Nothing is faster than the Tarmac SL8 thanks to a combination of aerodynamics, lightness, and ride quality that was previously thought impossible. After eight generations and more than two decades of development, it’s more than the fastest Tarmac ever: it’s the fastest racing bike in the world.
Aerodynamics or lightness alone don't win races: speed is what matters. To achieve that speed, it’s necessary to create a no-compromise combination of aerodynamics, lightness, stiffness, and compliance. Through real-world race simulations, our Ride Science team knows that the Tarmac SL8 is the fastest racing bike ever made on the routes that matter: 16.6 seconds faster over 40 km, 128 seconds faster at Milan San Remo, 20 seconds faster on the legendary Tourmalet climb.
- Aerodynamics in everything: we are putting aerodynamics where it matters, at the forefront, not just where it looks good. In the process, we’ve created our most aerodynamic road bike ever. Yes, it’s more aerodynamic than the Venge. Clean air is optimized for maximum advantage with the Tarmac’s new nose cone: the Speed Sniffer. By moving the head tube back, the tube that determines the width of the head tube, the leading edge of the head tube can be much sharper, providing a much lower drag shape. Using the new UCI rules, the Tarmac SL8 has the narrowest and most aerodynamic seat post we’ve ever made, ensuring that the dirty, fast-moving air around the legs can flow backward more cleanly. Doesn't the scent of victory smell sweet?
- MINIMUM WEIGHT, MAXIMUM AERODYNAMICS: Tarmac SL8 learned from Aethos to easily build up to the UCI minimum with a full aero setup. The team delivered a mind-blowing 685-gram frame that tickles the scales, 15% lighter than the Tarmac SL7 and lighter than any other on the World Tour*. With the ability to make lightweight a top priority on the downtube, seat tube, and rear of the bike, the lessons from Aethos were applied. The frame shape carries the load so efficiently that the additional carbon stiffness layers become redundant. *Unless, of course, you count the time Kasper Asgreen raced our 585-gram Aethos frame during a stage of the Tour.
- PERFORMS LIKE HELL, RIDES LIKE HEAVEN: With massive gains in stiffness-to-weight (a 33% improvement over the SL7), the Tarmac SL8 takes legendary handling, aggressive responsiveness, and world championship-proven geometry to the next level. The bike is stiffer at the pedals, more precise at the handlebars, and combines this with a supple ride in the saddle that sets a new benchmark for racing bike comfort. Thanks to our Rider-First engineering, every rider, regardless of size, gets the same unprecedented ride quality and handling. In the saddle, the Tarmac SL8 offers 6% more compliance, floating over rough roads with a flex feel unique to the world of racing bikes. The proven Tarmac geometry and 32mm tire clearance are identical to the SL7, ensuring easy adaptation and versatility for using higher-volume tires when needed.
- BEYOND GENDER: There can be more difference between two male riders than between a man and a woman. Gender alone does not provide enough data to specialize, and that means creating bikes for men or women is arbitrary and outdated. All riders can get the next-level advantage of the Tarmac SL8. It's time to go beyond gender.
- The Tarmac SL8 Expert Di2 offers exceptional performance with a full Ultegra Di2 group set, tubeless-ready Roval C38 carbon wheelset, and SL7 stem with Specialized Expert Shallow Drop alloy handlebars, making it an accessible and high-performance bike.
Technical Specifications
WEIGHT
- Weight (Size 56cm): 7.77 kg (17 lb, 2.1 oz)
COCKPIT
- SADDLE: Body Geometry Power Expert
- SEATPOST: S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset
- HANDLEBAR: Specialized Expert Shallow Drop, alloy, 125mm drop x 75mm reach
- BAR TAPE: Supacaz Super Sticky Kush
- STEM: Tarmac integrated stem, 6-degree
- SEAT CLAMP: Tarmac integrated wedge
FRAMESET
- FRAME: Tarmac SL8 FACT 10r Carbon, Rider First Engineered™, Win Tunnel Engineered, Clean Routing, Threaded BB, 12x142mm thru-axle, flat-mount disc
- FORK: Tarmac SL8 FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc
WHEELS & TIRES
- INNER TUBES: Turbo Ultralight, 48mm Presta valve
- FRONT WHEEL: Roval C38, 21mm internal width carbon rim
- REAR WHEEL: Roval C38, 21mm internal width carbon rim
- FRONT TIRE: S-Works Turbo, folding bead, 700x26mm
- REAR TIRE: S-Works Turbo, folding bead, 700x26mm
DRIVETRAIN
- CHAIN: Shimano Ultegra, 12-speed
- CASSETTE: Shimano Ultegra, 12-speed, 10-36t
- BOTTOM BRACKET: Shimano Threaded BSA BB
- SHIFT LEVERS: Shimano Ultegra R8170, hydraulic disc
- REAR DERAILLEUR: Shimano Ultegra R81000
- CRANKSET: SRAM Rival with Power Meter
- FRONT DERAILLEUR: Shimano Ultegra Di2 R8150, 12-speed
- CHAINRINGS: 52/36T
BRAKES
- FRONT BRAKE: Shimano Ultegra Di2 R8170, hydraulic disc
- REAR BRAKE: Shimano Ultegra Di2 R8170, hydraulic disc
- FRAME MATERIAL
- CARBON
- WHEEL
- 700
- FRAME TYPE
- RIGID
- GENDER
- MAN
- DRIVETRAIN
- ELECTRONIC
- CHAINRINGS
- DOUBLE
- SPEEDS
- 12
- BRAKES
- DISC HYDRAULIC
- CYCLING STYLE
- ROAD
- RIDER STYLE
- ROAD RACING
- CATEGORY
- ROAD BIKES
- Season
- 2025
- BIKE MODEL
- SPECIALIZED TARMAC