## Common ground
All options refer to spoke nipples—small threaded components used to adjust tension in bicycle wheel spokes.
## Options at a glance
**7318.2X – Iron or steel**
- **Defining trait:** Most common material; offers high strength and durability at low cost.
- **Typical examples:** Standard black steel nipples, commonly used in road and mountain bikes.
- **Best fit when:** Cost-effectiveness and robustness are priorities.
**7415.33 – Copper**
- **Defining trait:** Corrosion-resistant; less common due to lower strength.
- **Typical examples:** Decorative or vintage bike parts, specialty wheels.
- **Best fit when:** Aesthetic appeal or resistance to oxidation is key.
**7508.90 – Nickel**
- **Defining trait:** High corrosion resistance and moderate strength; often used in coatings.
- **Typical examples:** Nickel-plated steel nipples, marine or high-moisture environments.
- **Best fit when:** Long-term durability in harsh conditions is needed.
**7616.10 – Aluminium**
- **Defining trait:** Lightweight; prone to galling but ideal for weight-sensitive builds.
- **Typical examples:** High-performance racing wheels, lightweight bikes.
- **Best fit when:** Reducing overall wheel weight is critical.
**7907.00 – Zinc**
- **Defining trait:** Soft and prone to wear; typically used in coatings or plating.
- **Typical examples:** Zinc-plated steel nipples (not pure zinc).
- **Best fit when:** Low cost with basic protection; not for high-stress use.
**8101.99 – Tungsten**
- **Defining trait:** Extremely hard and dense; rarely used in standard nipples due to cost and brittleness.
- **Typical examples:** Experimental or ultra-high-strength specialty components.
- **Best fit when:** Extreme strength and wear resistance are required (rare).
**8102.99 – Molybdenum**
- **Defining trait:** High melting point and strength; used in extreme environments.
- **Typical examples:** Aerospace or industrial applications, not standard in bikes.
- **Best fit when:** Extreme heat or stress resistance needed (not typical for bicycles).
**8104.90 – Magnesium**
- **Defining trait:** Very light but reactive and prone to corrosion.
- **Typical examples:** Experimental or niche lightweight components.
- **Best fit when:** Weight reduction is paramount, and environment is controlled.
**8108.90 – Titanium**
- **Defining trait:** Excellent strength-to-weight ratio and corrosion resistance.
- **Typical examples:** Premium racing wheels, high-end custom builds.
- **Best fit when:** Performance, longevity, and light weight are top priorities.
## Key differences
| Material | Weight | Strength | Corrosion Resistance | Cost |
|----------------|--------|----------|------------------------|----------|
| Iron/Steel | Medium | High | Low (unless plated) | Low |
| Copper | Medium | Medium | High | Medium |
| Nickel | Medium | Medium | Very High | Medium-High |
| Aluminium | Low | Medium | Low-Medium | Medium |
| Zinc | Low | Low | Low | Low |
| Tungsten | Very High | Very High | High | Very High |
| Molybdenum | High | Very High | High | Very High |
| Magnesium | Very Low | Low | Low | Medium |
| Titanium | Low | High | Very High | Very High |
## How to choose
- Is weight the main concern? → 7616.10 (Al), 8104.90 (Mg)
- Is corrosion resistance most important? → 7508.90 (Ni), 8108.90 (Ti)
- Is cost the primary factor? → 7318.2X (Steel)
- Is strength critical in extreme conditions? → 8101.99 (W), 8102.99 (Mo)
## Overlaps & pitfalls
- Many materials are used in coated forms (e.g., zinc-plated steel). If the product is plated, use the base material (e.g., 7318.2X).
- Tungsten and molybdenum are not standard for bicycle nipples—likely misclassified unless explicitly designed for extreme use.
- No clear priority: choose based on the **primary function** (e.g., weight vs. durability)