SPECIALIZED

2026 Tarmac SL8 Pro+ - Rocket Goat Custom Build - Size 54
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SPECIALIZED
Rocket Goat is the fourth bike in our Sierra Bicycle Supply Custom Build Series — a celebration of cool, fun builds that ride as good as they look. Builder Nathan Troyer designed this one as a road racer with stealth climbing ability.
Finished in the Satin Carbon/Super Red Pearl colorway, this 2026 Specialized Tarmac SL8 is equal parts racer and climber.
Nothing is faster than the Tarmac SL8 thanks to a combination of aerodynamics, lightweight, and ride quality previously thought impossible. After eight generations and over two decades of development, it’s more than the fastest Tarmac ever - it’s the world’s fastest race bike. Your legs up for it?
Aerodynamics or lightweight alone don’t win races - speed is what matters. Delivering that speed requires creating an uncompromising combination of aerodynamics, lightweight, stiffness, and compliance. Through race simulations using real world data our Ride Science team knows the Tarmac SL8 is the fastest race bike ever made on the routes that matter - 16.6 seconds faster over 40km, 128 seconds faster over Milan San Remo, 20 seconds faster over the legendary Tourmalet climb.
Frame: Tarmac FACT 10r Carbon, Rider First Engineered™, threaded BB, 12x142mm thru-axle, flat-mount disc
Fork: FACT Carbon, 12x100mm thru-axle, flat-mount disc
Front Brake: SRAM Force AXS, E1 hydraulic disc, 160mm Paceline Rotors
Rear Brake: SRAM Force AXS, E1 hydraulic disc, 160mm Paceline Rotors
Shift Levers: SRAM Force AXS 2X E1 Electronic HRD
Front Derailleur: SRAM Force AXS E1, braze-on with SRAM battery
Rear Derailleur: SRAM Force AXS Rear Derailleur – 12-Speed, Short Cage, 36t Max, Black, E1, with SRAM battery
Cassette: SRAM Force XG-1270, 12-speed, 10–36t, silver (DT Swiss Ratchet XDR driver body, E1)
Chain: SRAM Force E1 12-speed, 114, silver
Crankset: SRAM Force E1 Crankset with Power Meter Spider, 165mm, 2x12-speed, 50/37T thread mount
Bottom Bracket: SRAM DUB BSA 68/73
Front Wheel: Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, DT for Roval 350 hub, DT Swiss Aerolite spokes, tubeless
Rear Wheel: Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, DT for Roval 350 hub, DT Swiss Aerolite spokes, tubeless
Front Tire: S-Works Turbo TLR Race, Black, 700x30mm – Tubeless
Rear Tire: S-Works Turbo TLR Race, Black, 700x30mm – Tubeless
Stem: Integrated
Handlebars: Roval Rapide Cockpit 100mm x 40cm
Tape: ZIPP Service Course Bar Tape X Black
Saddle: Specialized Roman Evo Pro with Mirror, 143mm
Seatpost: S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset
Seat Binder: Tarmac integrated wedge
Weight: 15.74 lbs (Size 54)
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I have had gatorskin tires for several years. They are by far the best tire.
Nice and light but plenty stiff. Great for all around riding on my Epic Evo.
The product was delivered as stated!
Never received the product. When I reached out I was told "well it shows delivered". They did say the would follow up with USPS but its been almost two weeks with no follow up.
from the color to the style and the fit! Perfect!
The S-Works Prevail 3 is one of the most comfortable bike helmets I’ve worn. The fit system adjusts perfectly, and once I ratchet the MIPS cradle to my head, the helmet almost disappears — it conforms so well that I barely notice I’m wearing it.
Ventilation is excellent. Riding in moderate weather around the mid-70s, my head stayed cool and comfortable without overheating. The airflow design really works.
Thankfully, I haven’t had to test the helmet in a crash, and I hope I never do. But the build quality and design give me a lot of confidence in the protection it offers. Highly recommended.
Very impressed by the whole experience with Sierra Bicycle Supply! The frameset was just as shown - brand new and gorgeous. It shipped fast with tracking info. Great pricing on the frameset and I picked up other stuff for my build. Great overall experience - highly recommended!!
Amazing bike at super price. Free shipping. Highly recommend buying from these guys.
Here is how I am using it.
- Customizable displays for ...
- Heart Rate Sensor
- Garmin Pedal Power Meters
- Lights control
- Cadence Sensor
- Speed Sensor
- DOES NOT WORK WITH SAMSUNG WATCH 8 CLASSIC
- Records Route Creation but need to be careful with saving rides as not doing two rides back to back = lost
- does not come with a one hundred twenty page manual.But I was able to find a pdf file online