Wheels Manufacturing Dropout 31
Dropout 31
Dropout 31
Wheels Manufacturing

Wheels Manufacturing Dropout 31

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Dropout 31 is a CNC-style replacement derailleur hanger for Haro, KHS, Marin and Schwinn frames. Durable, precise fit that restores shifting and protects your dropout.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 31 (Part #DROPOUT-31, SKU 270395) is a direct-fit replacement derailleur hanger designed for specific Haro, KHS, Marin and Schwinn models. Manufactured to tight tolerances, this hanger restores derailleur alignment after crashes or wear and prevents costly frame damage by acting as a sacrificial, replaceable component. The hanger is CNC-machined from high-strength 6061-T6 aluminum and finished with a hard-anodized coating for corrosion resistance and long service life. Its precision-cut mounting faces and derailleur mounting eye ensure repeatable indexing and stable shifting under load — essential for aggressive mountain riding and mixed-terrain use.

Key Features & Benefits

Precision construction: CNC machining delivers accurate geometry so your derailleur bolts up straight every time. That accuracy reduces chain rub, missed shifts and premature component wear. Durable materials: 6061-T6 aluminum with a hard-anodized finish offers an excellent strength-to-weight ratio and resists corrosion from mud and trail grime. As a replaceable part, the Dropout 31 protects your frame's dropout from deformation in a crash.

Fit, Compatibility & Installation

The Dropout 31 is listed as #31 in Wheels Manufacturing's catalogue and fits multiple makers including Haro, KHS, Marin and Schwinn frames that require this hanger shape. Double-check your frame's hanger shape or compare part numbers before ordering; this product is the hanger only — derailleur and mounting bolts may be sold separately. Installation is straightforward for a competent home mechanic: remove the damaged hanger, align the replacement, and torque mounting hardware to manufacturer spec. Shipping dimensions are compact (3" x 3" x 0.4") and weight is 0.04 lb, so it’s a lightweight spare to carry or keep in your toolbox.

Who This Hanger Is For

This hanger is aimed at mountain riders, weekend trail enthusiasts and bike shops who need a reliable replacement for specific Haro, KHS, Marin and Schwinn frames. If your bike experienced a crash, bent hanger, or inconsistent shifting, the Dropout 31 returns precise alignment without the cost of frame repair. It’s also a smart stocking choice for techs and home mechanics who want an OEM-quality, CNC-manufactured hanger that’s ready to install and built to last on rough, muddy trails.

Key Features

  • ✓ Direct-fit replacement for Haro, KHS, Marin and Schwinn frames
  • ✓ CNC-machined 6061-T6 aluminum for high strength-to-weight ratio
  • ✓ Hard-anodized finish resists corrosion and trail abrasion
  • ✓ Precision mounting surfaces restore accurate derailleur alignment
  • ✓ Lightweight spare — shipping size 3" x 3" x 0.4", 0.04 lb
  • ✓ Acts as sacrificial part to protect frame dropout during impacts
  • ✓ Easy installation for workshop or at-home mechanics

Specifications

Misc #31, Multiple Makers

Product Identifiers

Vendor Item # DROPOUT-31
UPC 836572005040

Frequently Asked Questions

How do I know if Dropout 31 fits my bike?

Compare your existing hanger shape to Wheels Manufacturing's #31 diagram or check your frame documentation for compatible hanger numbers. If your bike is a Haro, KHS, Marin or Schwinn model that lists #31 or the same hanger shape, Dropout 31 will be the correct fit.

What material is the hanger made from?

The Dropout 31 is CNC-machined from 6061-T6 aluminum and typically finished with a hard-anodized coating. This combination offers strong, lightweight performance and good resistance to corrosion from mud and moisture.

Does the hanger come with mounting hardware or a derailleur bolt?

This listing is for the hanger itself. Mounting hardware or derailleur bolts may not be included depending on the variant — check the product notes or contact us if you need a complete hardware kit. Most techs reuse the original bolt if it’s undamaged.

Can I straighten a bent hanger instead of replacing it?

Minor bends can sometimes be realigned with a hanger alignment tool, but repeated bending weakens the material and risks failure. Because hangers are inexpensive and sacrificial, replacement with a correct-fit Dropout 31 is the recommended, long-term solution.

How do I install this hanger safely?

Remove the damaged hanger, clean the mounting face, align the new hanger and tighten the mounting bolt to the bike manufacturer's torque spec. After installation, check derailleur alignment and perform a quick shift test; use a hanger alignment gauge if precise indexing is needed.

Will this hanger affect my shifting performance?

When correctly installed, the Dropout 31 restores the factory geometry of your derailleur mount, which improves shifting accuracy and chain engagement. Proper installation and torque are essential for best results.

Buying Guide

When choosing a replacement derailleur hanger, match the hanger number or silhouette to your frame. Hangers are highly specific — even small differences in hole spacing or thickness can change derailleur geometry and shifting performance. Prefer CNC-machined aluminum hangers for a balance of strength, precision and light weight. Consider keeping a spare hanger in your toolkit or pack if you ride trails or remote routes. Replace bent hangers rather than attempting repeated straightening; a fresh, correctly fitted hanger ensures reliable shifting and protects your frame from costly damage.

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