Common Bicycle Bolt Size Standards in North America (2025 Updated Guide)
Common Bicycle Bolt Size Standards in North America (2025)
As the demand for high-performance bicycles continues to grow in the North American market, choosing the right bolts is essential for both safety and reliability. In this article, we outline the most common bicycle bolt size standards used in 2025, covering components like stem bolts, crank bolts, disc rotor bolts, and bottle cage bolts.
1. Stem Bolts
- Common Sizes: M5 x 18mm, M6 x 20mm
- Material: Stainless steel or aluminum alloy (7075)
- Head Type: Hex socket head (Allen)
2. Crank Bolts
- Standard Size: M8 x 1.0 (fine thread), Length: 20–25mm
- Torque Spec: 35–50 Nm
- Tip: Always use a torque wrench to avoid thread stripping
3. Disc Rotor Bolts
- Common Size: M5 x 10mm
- Standard: ISO 6-bolt (used by SRAM, Shimano, etc.)
- Extras: Blue threadlocker pre-applied in most OEM bolts
4. Bottle Cage Bolts
- Typical Size: M5 x 12mm
- Material: Titanium or stainless steel (for corrosion resistance)
- Design: Countersunk head with cup washer preferred
Illustration of Standard Bicycle Bolts (2025)
Below is a visual guide to help you quickly identify the common bolt types and sizes:
2025 Trends in Bicycle Bolt Standards
- Fine Thread Preference: M5 x 0.8 is now standard for many assemblies
- Use of Pre-applied Threadlocker: Reduces loosening during high-speed riding
- Compliance with RoHS and REACH: Environmental coating standards are increasingly required
How to Choose the Right Bolts for Your Bike
Here are some key tips:
- Always match the thread pitch and depth to your frame’s design
- Use lightweight but strong materials (e.g., titanium for weight savings)
- Follow torque specifications to prevent damage to carbon or aluminum parts
Need High-Quality Bicycle Bolts?
At Taiming Hardware, we manufacture precision bicycle bolts tailored for the U.S. and Canada market. Our bolts are:
- Available in stainless steel, alloy steel, and titanium
- Customizable with laser logo, anti-corrosion coatings
- Offered in both small MOQ and bulk wholesale
Let’s Connect!
Are you a bike parts buyer or assembler? Need OEM or custom fasteners for your project? Let’s talk!
