TOOPRE CR01 6-in-1 Bicycle Chain Wear Gauge Tool, 304 Stainless Steel Chain Checker with Chain Hook, Screw Measuring Ruler, Presta Valve Nut/Core & Extension Rod Tool

Keep your bike maintenance simple with the TOOPRE CR01 Chain Wear Gauge, a compact 6-in-1 bicycle tool designed for everyday drivetrain inspection and small workshop tasks. Built from 304 stainless steel and finished with high-precision laser cutting, CNC edge milling, chamfering, and laser marking, this tool combines chain wear checking, chain handling, screw measurement, and valve-related functions in one slim piece.

Its three-step chain wear measurement design helps you read chain wear more clearly at 0.5% / 0.75% / 1%, making it easier to judge when a chain should be serviced or replaced. In addition, the integrated chain hook, screw length scale, thread diameter holes, and Presta valve service features make it a practical multi-use tool for riders, home mechanics, and bike shops.

Compact, lightweight, and easy to store, the CR01 is made for riders who want a precise and versatile tool without carrying unnecessary bulk.

Key Selling Points

• 6-in-1 multifunction design
  Combines chain wear detection, chain hook function, screw measurement, Presta valve nut disassembly/assembly, Presta valve core disassembly/assembly, and Presta valve extension rod disassembly/assembly.
• Three-step chain wear checking
  Marked for 0.5% / 0.75% / 1% wear levels, offering a more detailed reading than simpler single-step tools.
• 304 stainless steel construction
  Rust-resistant material helps maintain durability and stable use over time.
• Precision-focused manufacturing
  Made with high-precision laser cutting and CNC finishing, with milled edges and chamfering to improve accuracy and reduce burrs.
• Integrated screw measuring function
  Includes thread diameter measurement for M4 / M5 / M6 and a centimeter scale for screw length measurement.
• Practical chain hook design
  Helps hold the chain during repair or installation for more convenient handling.
• Laser-marked scale and function icons
  Clear markings are designed for wear resistance and everyday workshop use.

Product Features

Chain Wear Measurement

The CR01 uses a three-level step structure to check chain wear at:

• A: 0.5%
• B: 0.75%
• C: 1%

This design gives a more specific view of chain wear progression and helps riders better understand maintenance timing. The product images also show a 10-link measuring sample concept, intended to balance measuring convenience and accuracy.

Chain Hook Function

Integrated hooks at both ends allow the tool to assist with chain handling during repair, making it easier to manage the chain when working on drivetrain maintenance.

Screw Measurement

The tool includes:

• M4 / M5 / M6 thread diameter measuring holes
• CM ruler scale for screw length measurement

This adds extra utility for quick workshop checks without needing a separate small ruler or gauge.

Presta Valve Service Functions

According to the provided material, the tool supports:

• Presta valve nut disassembly & assembly
• Presta valve core disassembly & assembly
• Presta valve extension rod disassembly & assembly

The removal hole can also be used as a hanging hole for easy storage on a tool wall.

Material & Construction

Made from 304 stainless steel, the TOOPRE CR01 is designed for everyday bicycle maintenance use with attention to detail in both material and finish.

Manufacturing details shown in the provided images include:

• High-precision laser cutting
• CNC precision machining
• CNC edge chamfering
• Brushed surface finish
• Laser marking

These processes help create a tool with flat cross-sections, smoother edges, reduced burrs, and clearly visible markings. The chamfered edges are also highlighted as an important detail for safer handling.

Product Specifications

Ideal For

• Mountain bikes
• Road bikes
• Urban commuting bikes
• Home bike maintenance
• Cyclists who want a compact multi-function tool
• Bike shops needing a simple chain-check and utility tool

This tool is especially useful for riders who want to monitor chain wear, perform basic valve-related maintenance, and handle small workshop measuring tasks with one compact stainless steel tool.

What’s Included

• 1 × TOOPRE CR01 Chain Wear Gauge