Lightest raodbike | 6.651 g | DreamBuild Cervélo R5 Sepp Kuss

We visited Team Visma | Lease a Bike to film an exclusive behind-the-scenes look at how team mechanic Ritte Van Der Perren builds Sepp Kuss’ race bike from the ground up.
This video shows the complete WorldTour bike build process of the Cervélo R5, including detailed component weights, pro mechanic insights, and the final UCI-legal race weight.

⚠️ Important:
To comply with the UCI minimum weight limit of 6.8 kg, the bike was fitted with 180 grams of additional ballast weight. Without this extra weight, the bike would be under the UCI limit.

🔧 Bike: Cervélo R5 (Size 54)
🚴 Rider: Sepp Kuss
🏆 Team: Team Visma | Lease a Bike
⚖️ Final race weight: 6,831 g (UCI legal)
➕ Added ballast: 180 g

⚙️ Sepp Kuss’ Cervélo R5 – Full Specs & Component Weights
Frame & Cockpit
Frame: Cervélo R5 (54 cm) – 663 g
Fork: Cervélo R5 – 323 g
Axles: Cervélo R5 – 55.5 g
UDH: Cervélo – 25.5 g
Computer Mount: Cervélo – 22 g
Handlebar: Cervélo HB18 Carbon – 276.5 g
Bar Tape: FSA – 32.5 g

Seat Area
Seatpost: Cervélo R5 – 141.5 g
Saddle: Prologo – 137 g

Drivetrain & Shifting (SRAM RED AXS)
Shift / Brake Levers – 409 g
Front Derailleur – 148 g
Rear Derailleur – 264.5 g
Chain – 239 g
Crankset – 307.5 g
Cassette – 231 g
Chainring: SRAM RED XPLR AXS Power Meter Spider & X-Sync Road 52/39T – 292 g
Bottom Bracket: SRAM DUB Road-Wide PF47 Ceramic – 72.5 g
Batteries – 49 g

Braking System
Brakes: SRAM RED – 302 g
Brake Discs: SRAM – 236.5 g
Lockring: Wolf Tooth – 12.5 g

Wheels & Tires
Front Wheel: Reserve Turbulent Aero 42 – 593.5 g
Rear Wheel: Reserve Turbulent Aero 49 – 733 g
Tires: Vittoria Corsa Pro – 559.5 g
Valves: Vittoria – 10 g
Sealant: Vittoria – 100 g

Accessories & Compliance
Pedals: Wahoo Speedplay Aero – 214 g
Bottle Cages: Camelbak – 38 g
Small Parts: Cervélo R5 – 163 g

Additional UCI ballast weight – 180 g

🔍 Why this bike matters
The Cervélo R5 is Sepp Kuss’ go-to bike for the steepest climbs in the WorldTour. This build shows how modern Grand Tour bikes can easily go below the UCI weight limit, requiring teams to add ballast to stay legal.

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00:00 the parts
00:40 weight parts
02:46 bike build
bike fitting
bike build
wheels
drivetrain
final weight
final bike

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