When it comes to high-performance road bikes, the Specialized S-Works Tarmac SL7 Dura-Ace Di2 stands out as one of the most advanced and sought-after machines on the market. Combining aerodynamics, lightweight construction, and cutting-edge electronic shifting, this bike is designed for racers and enthusiasts who demand the best.
In this in-depth review, we’ll break down everything you need to know about the S-Works Tarmac SL7 Dura-Ace Di2, from its frame design and components to its ride quality and overall performance.
The Tarmac SL7 is Specialized’s flagship race bike, replacing both the Tarmac SL6 and the Venge (Specialized’s aero bike). The idea was to create a single bike that excels in both lightweight climbing and aerodynamic efficiency.
With the Dura-Ace Di2 groupset, this bike represents the pinnacle of Shimano’s electronic shifting technology, ensuring flawless gear changes and maximum performance.
Ultra-lightweight FACT 12r carbon frame (claimed weight: 800g for a 56cm frame)
Aero-optimized tubing for reduced drag
Shimano Dura-Ace R9270 Di2 12-speed electronic groupset
Roval Rapide CLX wheels (50mm deep front, 60mm rear)
S-Works Turbo Cotton tires (26mm) for grip and low rolling resistance
Integrated cockpit (Roval Rapide Handlebar) for clean cable routing
Now, let’s dive deeper into what makes this bike so special.
The Tarmac SL7 is built using Specialized’s FACT 12r carbon fiber, which is their highest-grade material. The result is an incredibly stiff yet compliant frame that weighs just 800g (size 56cm).
Deeper tube profiles (similar to the Venge) reduce drag without adding weight.
Fork and head tube integration smooths airflow.
Seatpost design minimizes turbulence.
Specialized claims the SL7 is 45 seconds faster over 40km compared to the SL6, making it a true “do-it-all” race bike.
The Dura-Ace R9270 Di2 is Shimano’s top-tier electronic groupset, offering:
12-speed cassette (11-30T) for a wider gear range
Hyperglide+ for smoother shifts under load
Semi-wireless design (battery-powered shifters with wired derailleurs)
Programmable shift logic via Shimano’s E-Tube app
The shifting is instantaneous and flawless, whether sprinting or climbing. The Di2 system ensures you never miss a gear, even in high-stress race scenarios.
The Roval Rapide CLX wheels are a perfect match for the SL7:
50mm front / 60mm rear depth for aerodynamics and stability
CeramicSpeed bearings for reduced friction
21mm internal width optimizes tire profile
Paired with S-Works Turbo Cotton tires (26mm), the bike delivers a smooth yet race-ready feel. These tires are known for their grip, suppleness, and low rolling resistance, making them ideal for crits and long road races.
The SL7 is incredibly stiff under power, translating every watt into forward motion. On steep climbs, the lightweight frame (complete build is around 6.8kg) makes it feel effortless.
The responsive geometry and short wheelbase make the SL7 agile in corners. The Rapide handlebar provides a confident grip for high-speed descents.
Despite its race focus, the SL7 has just enough compliance to take the edge off rough roads. The seatpost flex and tire clearance (up to 32mm) help with long-distance comfort.
✅ Blends aerodynamics and lightweight perfectly
✅ Dura-Ace Di2 is flawless and reliable
✅ Roval Rapide CLX wheels are fast and stable
✅ Aggressive yet comfortable geometry
✅ Clean, integrated cockpit looks sleek
❌ Very expensive (one of the priciest bikes on the market)
❌ Not the most comfortable for endurance rides
❌ Limited tire clearance compared to some rivals
The Specialized S-Works Tarmac SL7 Dura-Ace Di2 is a no-compromise race machine designed for:
Competitive racers who want every possible advantage
Serious enthusiasts who demand the best components
Riders who value both aerodynamics and lightweight
If you’re looking for the fastest all-around road bike and budget isn’t a concern, the SL7 is hard to beat. However, if you prioritize comfort or value, bikes like the Trek Emonda SLR or Canyon Ultimate CFR might be worth considering.
The S-Works Tarmac SL7 Dura-Ace Di2 is one of the best race bikes money can buy. It combines cutting-edge aerodynamics, ultra-lightweight construction, and Shimano’s best electronic groupset into a package that excels in almost every scenario.
While its high price tag puts it out of reach for many, those who can afford it will be rewarded with a bike that’s as close to pro-level as it gets.
