Serotta Coeur d’Acier Frame | 55cm Medium | Columbus Colorado C4 Steel | Deep Burgundy

Description

⭐Condition
Near mint condition with excellent paint throughout. Three minor flaws: cable rub on head tube (hand-painted touch-up, cables will cover), Minor chain rub on chainstay, and small chip on down tube. All logos are perfect and the finish maintains that distinctive Serotta depth.

📏Will this fit me?
Frame Size: 55cm – Medium (per the serial number)

• Top Tube: 54cm (center-to-center)
• Effective reach: 54cm – measured – may not be accurate
• Seat Tube: 54cm (top-to-center)
• Down Tube: 63cm (center-to-center)
• Chainstays: 41.5cm (center-to-center)
• Headtube: 198mm

📦What’s Included

• Serotta Colorado frame in near mint condition
• Water bottle screws, rear derailleur braze-on, seat clamp,

🚴The Ride
Serotta’s proprietary C4 steel delivers that legendary connected-to-the-road feel and climbing efficiency that serious cyclists crave, while the carbon wishbone seatstays add vertical compliance for all-day comfort without sacrificing lateral stiffness. This mixed construction gives you the best of both worlds – the buttery smoothness and power transfer of premium steel where it matters most, with carbon’s vibration damping exactly where you need it. The result is a frame that flies up hills and eats up centuries with equal enthusiasm.

🔧Workshop Wisdom
Be aware of the long head-tube and compact geometry – your fork will need a longer steerer tube, around 30cm, to help you dial in the perfect fit.

Before You Buy – A Note from Paul
Every frame I sell has been personally inspected and honestly described, but I want you to be 100% confident in your decision. Please take a moment to watch the detailed video included with this listing. Due to the personal nature of frame fit and the cost of shipping, I cannot accept returns. That’s why I encourage you to reach out to me directly with any questions, whether they’re about dimensions, condition, or build suggestions. I’m Paul – not a chatbot, not a sales team, just a fellow cyclist who wants to make sure this frame finds the right home. Let’s talk about this frame and make sure it’s perfect for you before you buy.

🔧What do I need to build this frame? (Please contact me if you need anything here)

• Headset: External 34mm cup
• Bottom Bracket: 68mm English threaded
• Seatpost: 27.2mm
• Front Derailleur: 34.9mm clamp
• Brakes: Rim brakes
• Stem: Standard 1 1/8″ steerer
• Rear spacing: 130mm
• Wheel clearance: 700c wheels

📋Other Frame Details

• Material: Columbus Colorado CS4 steel main triangle with carbon wishbone seat stays
• Made in USA craftsmanship
• Serotta’s premium steel/carbon hybrid design
• Single piece machined chainstay and dropout – stronger and added  road damping.
• The wishbone carbon fiber seat stay is molded into a single piece, wishbone design, and curved to absorb road noise. The carbon is capped on both ends to steel. At the dropouts, the steel cap is bolted to the dropout. This unique construction notes the craftsmanship and detail that most will overlook.
• Why a carbon seat stay?  You can’t shape steel like you can carbon. The wishbone design allows the carbon seatstays to filter out unwanted road harshness while preserving efficient power transfer. The curved geometry and carbon construction work together to reduce high-frequency vibrations (road buzz) that cause rider fatigue, while maintaining the lateral stiffness needed for responsive handling.
• 1795 grams (3.9 lbs)
• Year: 2000-2002

Is This Your Bike Thing?
This Coeur d’Acier represents the pinnacle of mixed-material framebuilding – Serotta’s proprietary C4 steel where you need connection and response, carbon where you need compliance and comfort. If you understand that the best frames aren’t just transportation but precision instruments crafted for serious riders, this frame deserves your attention. Contact me to discuss build options and make this exceptional piece of American framebuilding your next cycling investment.