Wheels Manufacturing Dropout-378

$38.50

In Stock

CNC-machined Dropout-378 derailleur hanger from Wheels Manufacturing — durable aluminum construction with hardware included. Ideal replacement for hard-to-fit road frames; verify exact fit at WheelsMfg.com.

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Product Details

Overview & Technology

Dropout-378 from Wheels Manufacturing is a precision, CNC-machined derailleur hanger engineered for long-lasting service and accurate derailleur alignment. Machined from high-strength aluminum alloy, this open-style hanger replaces damaged or missing hangers on frames that use the #378 footprint. The part ships with the required hardware for straightforward installation and is finished to resist corrosion and wear in real-world riding conditions. Because dropout shapes vary widely, Wheels Manufacturing offers a catalog of styles — consult wheelsmfg.com to confirm the exact match for your frame before ordering.

Key Features & Benefits

Precision CNC machining: Manufactured on tight-tolerance CNC equipment to ensure consistent derailleur positioning and reliable shifting performance. • 6061-T6 aluminum construction for a lightweight yet durable part that bends before fracturing in a crash. • Open-style #378 design makes wheel removal and derailleur servicing easier on many frame layouts. • Hardware included for immediate installation — saves a trip to the hardware bin.

Fit, Installation & Compatibility

The Dropout-378 is an "open" style hanger with the Wheels Manufacturing footprint #378. Compatibility is specific to certain frame dropouts; always confirm fit with the Wheels Manufacturing fit guide or by comparing your old hanger to the product photos and dimensions. The small shipping size (3" x 0.5" x 4.5") and weight (~0.1 lb) reflect its compact, lightweight design. Installation is simple: mount with the supplied bolts, torque to the frame manufacturer's spec (or 6–8 N·m if unspecified), and check hanger alignment with a derailleur hanger alignment gauge after installation. If you ride with a through-axle or unusual dropout geometry, double-check the orientation and clearance before final torque.

Who It's For

This replacement hanger is aimed at road cyclists, mechanics, and workshops that need a reliable, OEM-quality replacement for frames that match the #378 footprint. It's particularly useful for riders restoring older bikes, swapping frames, or repairing damage after a crash. Because Wheels Manufacturing offers many hanger shapes, this product is also well suited for bike shops that keep a variety of hangers on hand to service customers with hard-to-find or discontinued frame-specific parts.

Key Features

✓ CNC-machined 6061-T6 aluminum for strength and consistent alignment
✓ Open-style #378 design simplifies wheel removal and maintenance
✓ Includes stainless mounting hardware for immediate installation
✓ Lightweight — approximately 0.1 lb (compact shipping size)
✓ Corrosion-resistant finish for long service life in all conditions
✓ Direct replacement option for hard-to-fit or discontinued frames
✓ Consult WheelsMfg fit guide to match exact frame dropout style

Specifications

Misc	#378, Open

Product Identifiers

Vendor Item #	DROPOUT-378
UPC	811079025739

Frequently Asked Questions

How do I know if Dropout-378 fits my bike?

Compare your current hanger's shape and mounting points to the Wheels Manufacturing #378 profile or use the fit guide at wheelsmfg.com. If your original hanger is available, checking orientation and bolt spacing against the new part ensures a correct match.

What material is the hanger made from?

The Dropout-378 is CNC-machined from high-strength aluminum (commonly 6061-T6), giving a good balance of light weight and predictable deformation in impacts to protect the frame and derailleur.

Does it come with mounting hardware?

Yes — the hanger ships complete with the required mounting bolts so you can install it right away. Use the supplied hardware and torque to the frame manufacturer's specification.

Can I straighten a bent hanger or should I replace it?

Minor bends can sometimes be realigned with a derailleur hanger alignment tool, but repeated bends weaken the part. Given the low weight and cost of new dropouts, replacement is usually the safest choice for reliable shifting.

Is this hanger compatible with thru-axle wheels?

Compatibility depends on your frame's dropout design rather than the wheel axle type alone. Verify that the #378 open profile matches your frame's mounting points; if unsure, check wheelsmfg.com or contact Forest Bikes with your frame details.

What torque should I use when installing the hanger?

Follow your frame manufacturer's torque spec if available. If not specified, a common recommendation is 6–8 N·m for hanger mounting bolts. Avoid over-torquing which can distort threads or the hanger.

Buying Guide

When buying a replacement derailleur hanger, the most important step is confirming the exact hanger footprint and orientation for your frame. Wheels Manufacturing numbers each hanger by profile — use photos, measurements, or the online fit guide to pick the correct part. If your frame is older, rare, or has an uncommon dropout shape, consider keeping the original hanger as a template when ordering. Choose CNC-machined aluminum hangers like the Dropout-378 for reliable shifting and predictable behavior in a crash. Make sure the part includes hardware and plan to check alignment with a hanger alignment tool after installation to restore crisp shifting performance.

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