The RISK RL232 Aluminum Bolt Measuring Ruler is a compact measuring tool designed for identifying bicycle bolt diameter and bolt length. It helps users quickly check common metric screw sizes and select the correct replacement bolt for bike repair and maintenance.

Made from lightweight aluminum alloy, this ruler features a 0–75mm length scale and bolt diameter gauge holes for M3, M4, M5, M6, M8, and M10 screws. Its pocket-size card design is easy to carry, store, and use in a workshop or home repair kit.

This tool is especially useful for measuring titanium bolts, crank bolts, stem bolts, brake bolts, bottle cage bolts, and other bicycle fasteners.

This product includes the measuring ruler only. Bolts shown in images are for display purposes and are not included.

Key Benefits

• Bolt Diameter Measurement
  Built-in gauge holes for M3 / M4 / M5 / M6 / M8 / M10 bolts.
• Bolt Length Measurement
  Edge ruler measures bolt length from 0 to 75mm.
• Metric Screw Size Identification
  Helps determine bolt specifications such as M5×20mm or M6×40mm.
• Aluminum Alloy Material
  Lightweight, durable, and resistant to daily workshop wear.
• Compact Card Design
  Small enough to keep in a toolbox, repair kit, or parts drawer.
• Clear Printed Markings
  Easy-to-read scale and hole labels for quick checking.
• Useful for Bike Maintenance
  Helps identify common bicycle bolts before replacement or upgrade.

Suitable For

• Bicycle bolt measurement
• Titanium bolt size checking
• Screw diameter identification
• Bolt length checking
• Bike repair shops
• Home bike mechanics
• Workshop tool kits
• MTB, road, gravel, folding, and commuter bike maintenance
• Measuring stem, brake, bottle cage, crank, derailleur, and accessory bolts

How to Use

1. Insert the bolt thread into the matching gauge hole.
2. The hole that fits correctly indicates the bolt diameter, such as M5 ≈ 5mm.
3. Place the bolt along the ruler edge to measure the threaded length.
4. Combine the diameter and length to determine the bolt size, such as M5×20mm.

Notes

• This tool is for measuring metric bolt diameter and length.
• Bolts, screws, and other accessories shown in images are not included.
• Measure the threaded section according to your actual bolt type.
• Manual measurements may vary slightly.
• For special bolts, always confirm compatibility with the original part specification.

Product Details