The Felt IA Disc (1.0) Owner's Manual Supplement focuses on the shift and brake routing for Felt IA triathlon bikes, providing detailed instructions for mechanics. This guide is essential for ensuring proper installation and functionality of the bike's drivetrain and braking systems, particularly for models equipped with electronic or mechanical shifting.

Function Description:

This manual supplement serves as a comprehensive guide for routing mechanical wires, electronic wires, and brake hoses within the IA frame modules. It addresses various drivetrain configurations, including Shimano Di2 Electronic Drivetrain (with RS910 junction or standard Junction A), SRAM eTap Wireless Electronic Drivetrain, and Mechanical Drivetrains. The primary function is to provide step-by-step instructions and visual aids (diagrams) to facilitate correct and efficient routing, ensuring optimal performance and safety of the bicycle. It emphasizes the need for above-average bicycle mechanics skills and specialized tools for these procedures.

Important Technical Specifications (as derived from the manual):

The manual details specific components and their required lengths for different frame sizes and drivetrain types.

Shimano Di2 Electronic Drivetrain (with RS910 junction):

Parts: 2 Brake hoses, 7 Shimano E-tube wires, 1 Shimano “Y” E-tube connector (EW-JC130), 2 Shimano Junction B, 1 Shimano Junction A (RS910), 1 Felt 8mm port (2.5mm hole, conical grommet), 1 Felt 8mm port (2.5mm hole, flat grommet).
E-tube wire lengths (EW-SD501) for 48CM-58CM frame size: 1200mm (Qty 1), 750mm (Qty 1), 300mm (Qty 3), 850mm (Qty 2).
Brake hose lengths (L/ST-R9180(L)-70SS for Left Lever/Front Brake, R/ST-R9180(R)-34SS for Right Lever/Rear Brake):
- 48CM: Front 750mm, Rear 1550mm
- 51CM: Front 800mm, Rear 1600mm
- 54CM: Front 800mm, Rear 1650mm
- 56CM: Front 800mm, Rear 1700mm
- 58CM: Front 850mm, Rear 1700mm

Shimano Di2 Electronic Drivetrain (with standard Junction A):

Parts: 2 Brake hoses, 6 Shimano E-tube wires, 1 Shimano “Y” E-tube connector (EW-JC130), 1 Shimano Junction B, 1 Shimano Junction A (Standard), 1 Felt 8mm port (2.5mm hole, conical grommet), 1 Felt 8mm port (2.5mm hole, flat grommet).
E-tube wire lengths (EW-SD501) for 48CM-58CM frame size: 1200mm (Qty 1), 250mm (Qty 1), 300mm (Qty 1), 750mm (Qty 1), 850mm (Qty 2).
Brake hose lengths (L/HD-T910-70SS for Left Lever/Front Brake, R/HD-T910-34SS for Right Lever/Rear Brake):
- 48CM: Front 750mm, Rear 1550mm
- 51CM: Front 800mm, Rear 1600mm
- 54CM: Front 800mm, Rear 1650mm
- 56CM: Front 850mm, Rear 1700mm
- 58CM: Front 850mm, Rear 1700mm

SRAM eTap Wireless Electronic Drivetrain:

Parts: 2 Brake hoses, 1 SRAM eTap BLIP unit, 1 SRAM eTap CLIC unit, 1 SRAM eTap AXS BlipBox, 2 Felt 8mm grommet plug. (Note: Electronic wires are blue components, brake hoses are red components in diagrams).
Brake hose lengths (DB-S-900-A1-70SS for Left Lever/Front Brake, DB-S-900-A1-34SS for Right Lever/Rear Brake):
- 48CM: Front 750mm, Rear 1550mm
- 51CM: Front 800mm, Rear 1600mm
- 54CM: Front 800mm, Rear 1650mm
- 56CM: Front 800mm, Rear 1700mm
- 58CM: Front 850mm, Rear 1700mm

Mechanical Drivetrains:

Parts: 2 Brake hoses, 4 4mm shift housing sections, 1 Felt 8mm port (4mm hole, conical grommet), 1 Felt 8mm grommet plug. (Note: Shifter cables are blue components, brake hoses are red components in diagrams).
Cable lengths:
- 48CM-51CM: Rear shifter adjuster to rear derailleur (Cable B) 1380mm, Shifter from extensions to adjusters (Cable A) 500mm (Qty 2), Front shifter adjuster to front derailleur (Cable C) 920mm.
- 54CM-56CM: Rear shifter adjuster to rear derailleur (Cable B) 1420mm, Shifter from extensions to adjusters (Cable A) 500mm (Qty 2), Front shifter adjuster to front derailleur (Cable C) 960mm.
- 58CM-60CM: Rear shifter adjuster to rear derailleur (Cable B) 1040mm, Shifter from extensions to adjusters (Cable A) 500mm (Qty 2), Front shifter adjuster to front derailleur (Cable C) 1500mm (Qty 2).

Usage Features:

Step-by-step instructions: The manual breaks down the routing process into clear, numbered steps for each drivetrain type and component (shifters, rear brake hose, front brake hose).
Visual diagrams: Each step is accompanied by detailed figures (e.g., Figure A1, Figure B2, Figure C3, Figure D4) that visually illustrate the routing paths of electronic wires (blue, purple, green), shifter cables (blue), and brake hoses (red). This visual guidance is crucial for understanding complex internal routing.
Component identification: The manual clearly lists the specific Shimano and SRAM part numbers for connectors, junctions, and other components, aiding in correct assembly.
Grommet usage: Instructions include the correct use of Felt 8mm ports with conical or flat grommets for wire entry/exit points, ensuring a clean and secure installation.
Integrated basebar routing: Specific diagrams and instructions are provided for bikes utilizing an integrated basebar, highlighting how cables and hoses are routed within this design.
Drivetrain-specific guidance: The manual differentiates routing procedures based on the type of drivetrain (Shimano Di2, SRAM eTap, Mechanical), acknowledging the unique requirements of each system.
Troubleshooting/Tips: Notes are included to advise on helpful tools (e.g., Park Tool IR-2 specialty tool) and to remind users about necessary preparatory steps, such as removing headtube covers for better access.
Warranty information: Directs users to the Felt Bicycles website for warranty policy details.

Maintenance Features (indirectly supported by the manual):

While primarily an installation guide, the detailed routing instructions indirectly support future maintenance by:

Facilitating component replacement: By understanding the exact routing paths, mechanics can more easily replace worn or damaged wires, hoses, or components.
Ensuring proper function: Correct routing, as outlined, prevents kinking, excessive friction, or interference, which can lead to premature wear or malfunction of shifting and braking systems. This contributes to the longevity and reliability of the bike's components.
Aiding in diagnostics: If issues arise, the detailed diagrams can help in tracing the path of wires and hoses to identify potential points of failure or obstruction.
Promoting professional service: The manual explicitly states that procedures require above-average skills, encouraging owners to seek authorized Felt Bicycles retailers for high-quality service, which includes proper maintenance and repairs.
Providing reference for adjustments: Knowing the exact lengths and routing of cables and hoses is essential when making adjustments to the drivetrain or brakes, ensuring that there is adequate slack and no undue tension.

In summary, this supplement is a vital resource for mechanics working on Felt IA triathlon bikes, ensuring that the intricate routing of electronic and mechanical systems is performed accurately, contributing to the bike's performance, safety, and ease of future servicing.

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