TOOPRE ISCG03/ISCG05 Chain Guide Adapter Aluminum Alloy BB Mount Conversion Seat for MTB Single Chainring

The TOOPRE ISCG Chain Guide Conversion Seat is designed for mountain bikes that need to install an ISCG03 or ISCG05 single-chainring chain guide on a frame with a BSA threaded bottom bracket. It provides a practical conversion solution for bikes without a built-in ISCG mount, helping improve chain stability during off-road riding.

Made from high-strength aluminum alloy, this adapter is processed with CNC precision machining and finished with anodizing for a clean appearance, lightweight performance, and reliable durability. With a compact structure and low weight, it is ideal for MTB riders who want to upgrade to a single-disc chain guide system without changing the frame.

The adapter is suitable for 68/73mm bottom bracket shell frames with BSA threaded bottom brackets. It can be used with compatible external bottom bracket systems such as Shimano BB50, BB51, BB70 and GXP-style external bottom brackets. Please note that it is not suitable for press-fit or integrated bottom bracket systems.

Key Features

• ISCG03/ISCG05 Compatible
  Designed to work with ISCG03 and ISCG05 single-disc chain guides.
• BB Mount Conversion Design
  Converts a BSA threaded bottom bracket area into a chain guide mounting position.
• High-Strength Aluminum Alloy
  Lightweight, strong, and durable for MTB riding conditions.
• CNC Precision Machining
  Accurate hole positioning and clean finishing for stable installation.
• Anodized Surface Treatment
  Improves corrosion resistance and provides a professional black finish.
• Lightweight Construction
  Compact design helps reduce unnecessary bike weight.
• Suitable for Single Chainring Setups
  Helps install a chain guide for improved chain retention on rough terrain.

Specifications

Compatibility Notes

Compatible with:

• ISCG03 single-disc chain guides
• ISCG05 single-disc chain guides
• 68 / 73 mm frame bottom bracket shells
• BSA threaded external bottom brackets
• Shimano BB50 / BB51 / BB70 external bottom brackets
• GXP-style external bottom brackets

Not compatible with:

• Press-fit bottom brackets
• Integrated / embedded bottom brackets
• Frames without suitable BSA threaded bottom bracket structure

Installation Steps

1. Remove the bicycle chain.
2. Remove the crankset.
3. Remove the bottom bracket using a BB wrench.
4. Place the ISCG conversion seat vertically into the bottom bracket area.
5. Tighten it together with the bottom bracket using the correct wrench.
6. Install the ISCG03 or ISCG05 single-disc chain guide onto the adapter.
7. Reinstall the crankset and adjust the chain guide position.

Package Includes

• 1 × TOOPRE ISCG Chain Guide Conversion Seat
• Mounting screws/accessories may be included depending on package version