Wheels Manufacturing DROPOUT-431

$26.50

In Stock

CNC-machined 6061 aluminum derailleur hanger for COOP frames with black anodize finish. Lightweight, precise replacement that mounts with a single 8mm chainbolt (long).

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Product Details

Overview & Technology

Wheels Manufacturing DROPOUT-431 is a precision replacement derailleur hanger engineered from CNC-machined 6061-T6 aluminum and finished with a durable black anodize. Designed specifically for COOP frames, this hanger restores perfect derailleur alignment after impacts or wear without adding unnecessary weight — it ships at just 0.04 lb and packs small for quick delivery. Why CNC and 6061? The CNC process ensures exact tolerances for repeatable shifting performance while 6061 aluminum delivers an ideal balance of stiffness, corrosion resistance and impact survivability. The black anodized coating adds scratch resistance and a clean, OEM-style look that blends with most frame finishes.

Key Features & Benefits

Designed for reliability: this hanger uses a single long 8mm chainbolt for secure attachment to the frame and accurate positioning of the derailleur. The bolt-driven mounting reduces movement under load for crisp, dependable shifting. • CNC-machined 6061 aluminum for precise geometry and consistent performance. • Black anodized finish for corrosion resistance and a low-profile look. • Lightweight footprint — minimal added weight while maintaining strength. • Direct replacement for COOP frame dropout designs, part number 270955 / DROPOUT-431.

Fit, Installation & Compatibility

This hanger is manufactured to match COOP frame dropout interfaces and installs with (1) 8mm chainbolt (long). Before ordering, compare your existing hanger shape and bolt type to the DROPOUT-431 — matching the bolt size and hanger mounting pattern is critical for correct fitment. Installation tips: use a quality 8mm hex or chainbolt tool, clean and lightly grease the chainbolt threads, torque to your frame manufacturer's spec (if available), and verify derailleur alignment with a hanger alignment gauge or by shifting under low load. If your frame uses a different bolt style or a replaceable hanger plate, confirm compatibility with Forest Bikes support or Wheels Manufacturing's compatibility charts.

Who This Hanger Is For

This part is ideal for mountain riders and mechanics who need a reliable, OEM-fit replacement for COOP frames. If your derailleur hanger is bent, cracked or lost in a crash, the DROPOUT-431 gets you back on the trail quickly with precision shifting restored. It's also a great spare to carry on long rides or keep in your home shop — lightweight and inexpensive compared to drivetrain repairs that can follow from riding on a compromised hanger.

Key Features

✓ CNC-machined 6061-T6 aluminum for consistent, precise geometry
✓ Black anodized finish resists corrosion and hides scuffs
✓ Mounts with a single long 8mm chainbolt for secure attachment
✓ Direct replacement for COOP frames — part #270955 / DROPOUT-431
✓ Ultra-lightweight: 0.04 lb shipping weight, compact packaging
✓ Restores shifting accuracy after impacts or hanger damage
✓ OEM-style fit reduces risk of drivetrain misalignment or noise

Specifications

Misc

COOP

Product Identifiers

Vendor Item #	DROPOUT-431
UPC	811079026750

Frequently Asked Questions

Is this hanger compatible with my COOP frame?

DROPOUT-431 is manufactured specifically for COOP-compatible dropouts. Compare your current hanger's shape and bolt style to this part — it uses a single long 8mm chainbolt. If the mounting pattern and bolt size match, it will be compatible.

What tools do I need to install the DROPOUT-431?

Installation requires a suitable 8mm hex or chainbolt tool, a torque wrench if you want to tighten to a specific spec, and light grease for the bolt threads. A hanger alignment gauge is recommended to check and fine-tune derailleur alignment after installation.

Can I bend this hanger back into shape instead of replacing it?

While minor bends can sometimes be corrected, DROPOUT-431 is inexpensive and designed to be a sacrificial, replaceable part. Replacing a bent hanger is safer and more reliable than repeatedly bending aluminum, which can fatigue and fail.

Does the hanger come with the 8mm chainbolt?

The product listing specifies attachment with (1) 8mm chainbolt (long), but often the hanger is sold alone. Check your variant details at checkout or contact Forest Bikes customer service to confirm whether the bolt is included with your order.

How durable is the black anodized finish?

The black anodize provides a hard, protective surface that resists corrosion and light abrasion. It improves longevity and appearance compared to bare aluminum, but heavy impacts or extreme abrasion can still mark the surface.

What should I do after replacing the hanger?

After installation, verify derailleur alignment and shifting performance across the cassette. Test ride in a safe area, make minor cable or limit adjustments if needed, and re-check bolt torque after the first few rides.

Buying Guide

When buying a replacement derailleur hanger, match the hanger shape and mounting hardware to your frame. Manufacturers like Wheels Manufacturing publish application charts that make it easier to confirm the correct part number; for COOP frames, the DROPOUT-431 corresponds to part #270955. Check whether the hanger is sold with or without the chainbolt — if your original bolt is damaged, order a new one. Choose CNC-machined aluminum hangers for precision and repeatability. Keep a spare in your pack or toolbox: derailleur hangers are designed to fail before a derailleur or frame takes more serious damage, and swapping a hanger on the trail is often a faster, cheaper fix than other repairs.

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