Giant OCR C1 Carbon Frameset | 57cm Large | 2005 | FormulaOne Composite | Excellent

Description

⭐Condition
Excellent — minimal wear consistent with light use. Minor cosmetic imperfections on the logo decal on the top tube and racing stripes on the rear stays. The carbon weave shows beautifully through the gloss finish. No structural issues, cracks, or damage. All threads in excellent condition.

📏Will this fit me?
Frame Size: 57cm — Large

• Top Tube: 57cm (center-to-center)
• Seat Tube: 57cm (top-to-center)
• Down Tube: 66cm (center-to-center)
• Chainstays: 43cm (center-to-center)
• Rear Dropout Spacing: 130mm
• Front Dropout Spacing: 100mm
• Wheel Size: 700c

📦What’s Included

• Frame — FormulaOne carbon composite, excellent condition
• Fork — carbon with aluminum steerer, original to frame
• All cable guides
• Rear derailleur hanger
• Front derailleur braze-on mount
• Water bottle cage bolts
• Seat clamp

🚴The Ride
The OCR C1 rides with the confident directness you’d expect from a race-oriented carbon frame — quick to accelerate, precise in corners, and composed at speed. The oversized junction points put power straight to the rear wheel, while the flattened rear stays absorb enough road buzz to stay comfortable on longer rides. This is a frame that rewards effort.

🔧Workshop Wisdom
The OCR C1 uses Giant’s integrated headset system with a 47mm OD head tube. The correct replacement headset is the FSA No. 11 AGY (Giant part #1310-NO11AQ-901), available on Amazon and through GiantBikeSpares.com — straightforward to source and install. Everything else on this frame is completely standard.

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?

• Headset: FSA No. 11 AGY — integrated, 47mm OD headtube, 1-1/8″ steerer (Giant part #1310-NO11AQ-901, available on Amazon)
• Bottom Bracket: 68mm English (BSA) threaded
• Stem: 1-1/8″ threadless
• Seatpost: 27.2mm
• Front Derailleur: Braze-on mount
• Brakes: Standard caliper / side pull
• Rear spacing: 130mm — compatible with modern 8, 9, and 10-speed drivetrains

📋Other Frame Details

• Material: FormulaOne carbon composite
• Weight: Frame + fork approximately 3lbs
• Internal cable routing
• Original gloss clear coat over visible carbon weave with racing stripe accents
• Serial #GA5C397
• 2005 model year

Is This Your Bike Thing?
One of the cleanest large-size OCR C1 framesets you’ll find — Giant’s flagship carbon from an era when this was the real deal. Reach out before you buy and let’s make sure it’s the right fit.

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