This document is a quick guide for the BMC ICS Aero Clip-On Extensions, which are designed to enhance the aerodynamic performance and rider comfort on BMC ICS Aero cockpit-equipped bicycles.
Function Description:
The BMC ICS Aero Clip-On Extensions are an accessory designed to provide an aerodynamic riding position for cyclists, particularly useful for time trials, triathlons, or long-distance rides where maintaining an aero tuck is beneficial. These extensions attach to the existing ICS Aero handlebar, allowing the rider to rest their forearms and hands in a more streamlined position, reducing drag and improving efficiency. The system offers versatility in mounting, allowing for both "low" and "high" positions to accommodate different rider preferences and aerodynamic requirements. The "low position" places the extensions below the handlebar, while the "high position" places them above, offering flexibility in achieving the desired stack height for the armrests and extension bars. An assembly guide is provided to ensure correct positioning during installation, which is then removed once the extensions are securely installed.
Important Technical Specifications:
The clip-on extensions system comprises several components, each with specific part numbers and descriptions:
- Item Number: 30000749
- Clamps:
- LEFT Upper Clamp (Marked "L" on inner face)
- LEFT Lower Clamp (Marked "L" on inner face)
- RIGHT Upper Clamp (Marked "R" on inner face)
- RIGHT Lower Clamp (Marked "R" on inner face)
- Extension Clamps (Part of the assembly for securing the carbon extensions)
- Extension Bodies:
- LEFT Extension Body
- RIGHT Extension Body
- Fasteners (Bolts and Washers):
- M5 X 25 (including 5x8.5mm Washer)
- M4x12 (including 4x7mm Washer)
- M4x20 (including 4x7mm Washer)
- M6 Bolt M6 X12 (for armrests)
- Arm Rests and Pads:
- Arm Rests (The structural component for forearm support)
- Arm Pads (Padded cushions for comfort)
- Extensions:
- Carbon Extensions (The main bars where hands are placed)
- Assembly Guide Components:
- Assembly Guide (to be removed after assembly)
- Assembly Guide Bolts (M6 X 12)
- O-ring 5.6x1.8 (likely for the assembly guide bolts)
Torque Values for Installation:
- 5 Nm: For bolts securing the upper and lower clamps to the handlebar, and for bolts securing the armrests to the extension bodies. These are typically indicated by red circles in the diagrams.
- 3 Nm: For bolts securing the extension clamps to the extension bodies. These are typically indicated by blue circles in the diagrams.
- Gap in Clamp: It is important to note that a gap in the clamp is expected when correctly tightened to 5 Nm.
Usage Features:
- Mounting Options: The extensions can be mounted in two distinct positions:
- Low Position: Extensions are positioned below the handlebar. This typically results in a lower, more aggressive aerodynamic profile.
- High Position: Extensions are positioned above the handlebar. This can offer a slightly more upright, potentially more comfortable, aerodynamic position.
- Adjustability:
- Arm Rest Position: The arm rest position is adjustable using different mounting holes on the extension bodies, allowing riders to fine-tune their comfort and fit.
- Center-to-Center Distance: The guide ensures a consistent center-to-center distance of 100mm between the extensions, providing a standardized and stable base for the rider's forearms.
- Assembly Guide: A temporary assembly guide is used during installation to ensure the correct and consistent positioning of the tri extensions on the handlebar. This guide must be removed once the clip-on extensions are fully installed.
Maintenance Features:
- Grip Paste Application: It is recommended to apply grip paste on the extension clamp cylinders during installation. This helps to increase friction between the carbon extensions and the clamps, preventing slippage and ensuring a secure fit, especially important for carbon components.
- Torque Specifications: Adhering to the specified torque values (5 Nm and 3 Nm) during installation is crucial for the safety and longevity of the components. Overtightening can damage components, while undertightening can lead to slippage or failure.
- Regular Inspection: As with all bicycle components, regular inspection of the clip-on extensions, bolts, and clamps for any signs of wear, damage, or loosening is recommended to ensure continued safe operation.
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