MEROCA Aluminum Alloy Bike Crank Cap Screw M15 M18 M20 MTB BMX

MEROCA Aluminum Alloy Bike Crank Cover Screw – MTB, BMX & Road Cycling

Upgrade your drivetrain with the MEROCA Aluminum Alloy Crankset Cover Screw — precision-engineered for mountain bikes, BMX, and road bikes. Available in M15, M18, and M20 (×8mm) sizes, these lightweight crank cap screws replace flimsy plastic OEM fasteners with a far stronger, longer-lasting alternative that looks great on any build.

Made in Mainland China.

Why Choose MEROCA Crank Cap Screws?

• Premium 7075 Aluminum Alloy – Aircraft-grade material delivers exceptional strength-to-weight ratio, far outperforming standard plastic crank screws.
• CNC Machined One-Piece Construction – High-precision CNC cutting ensures uniform dimensions, a flat bright surface finish, and consistent, tight tolerances every time.
• Deep Precision Threads – Fine, dense threads provide even force distribution and a rock-solid, secure fit that won't loosen under high torque or rough trail conditions.
• Anodized Finish – Vibrant anodized colors (Black, Red, Blue, Pink, Colorful/Dazzle) resist corrosion and scratches, keeping your bike looking sharp season after season.
• Reusable & Long-Lasting – Built to be installed and removed multiple times without wear, making these a smart long-term investment for any rider.
• Ultra-Lightweight – M15: ~5.3g | M18: ~7.5g | M19: ~8g | M20: ~8.4g. Shave grams without sacrificing durability.

Specifications

Compatible With

These crank cap screws are designed for a wide range of cranksets used on mountain bikes (MTB), BMX bikes, and road bikes. Always verify your crankset's thread size (M15, M18, M19, or M20) before ordering.

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Frequently Asked Questions

Q: What sizes are available for the MEROCA aluminum alloy crank cap screw?

A: The MEROCA crank cover screws are available in M15, M18, M19, and M20 (×8mm) sizes. Each size is designed to fit specific crankset models used on MTB, BMX, and road bikes. Check your existing crank bolt diameter before selecting your size.

Q: Are these crank cap screws compatible with all bike types?

A: These MEROCA crank screws are compatible with a wide range of mountain bikes (MTB), BMX bikes, and road bikes. They replace standard plastic OEM crankset cover screws. We recommend verifying your crankset's thread specification to ensure the correct fit.

Q: Why are aluminum alloy crank screws better than the original plastic ones?

A: The 7075 aluminum alloy used in MEROCA crank screws is significantly stronger and more durable than standard plastic fasteners. CNC machining ensures precise dimensions and threading, while the anodized finish adds corrosion resistance — making them far more reliable under the high torque and impact demands of off-road and competitive cycling.

Q: Can these screws be reused after removal?

A: Yes! Unlike plastic crank caps that can crack or strip on removal, the MEROCA aluminum alloy crank screws are fully reusable. Their precision CNC threads maintain integrity through multiple installations and removals, making them ideal for riders who frequently service their bikes.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.