Wheels Manufacturing Dropout 138
Dropout 138
Dropout 138
Wheels Manufacturing

Wheels Manufacturing Dropout 138

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Direct-fit replacement Dropout 138 derailleur hanger for Eddy Merckx and compatible road frames. CNC-machined 6061-T6 aluminum gives accurate alignment, low weight, and corrosion resistance.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 138 is a precision replacement derailleur hanger engineered as a direct-fit part for Eddy Merckx and other compatible road frames (also found on select Norco, Pinarello and Stevens models). It restores factory alignment and derailleur geometry after crashes or hanger damage, helping you get back to shifting confidently. Constructed from CNC-machined 6061-T6 aluminum and finished with a black anodize, Dropout 138 is lightweight (0.05 lb), stiff enough to maintain accurate indexing under load, and protected against corrosion from road conditions. The machining tolerances mirror the original spec to retain chainline and shifting precision.

Key Features

Precision machining & material: CNC-machined 6061-T6 aluminum provides a high strength-to-weight ratio and consistent geometry for reliable shifting. OEM-fit replacement: Designed to match the #138 specification used on Eddy Merckx, Pinarello, Norco and Stevens frames. The exact contours and bolt pattern reproduce factory alignment so the derailleur mounts and indexes correctly. • Black anodized finish for corrosion resistance and low-profile appearance • Low mass — 0.05 lb — without sacrificing stiffness • Shipping size 3" x 3" x 0.4", ideal for spares kit or service shop inventory

Fit & Compatibility

Dropout 138 is intended as a drop-in replacement for frames that use the Wheels Manufacturing #138 / DROPOUT-138 spec. Confirm compatibility by comparing the shape, mounting hole spacing and part number printed on your existing hanger. It is commonly listed for Eddy Merckx, and also fits select Norco, Pinarello and Stevens models. Before ordering, compare your current hanger to photos and dimensions, or contact our tech team with your frame model and year. Because derailleur hangers are chassis-specific, a visual and dimensional check is the safest way to ensure fit; when in doubt, bring the old hanger or a photo to a mechanic for verification.

Who It's For

This dropout is ideal for road cyclists, mechanics and frame builders who need a precise, lightweight replacement hanger for Eddy Merckx and compatible frames. Keep one in your home tool kit, service stand, or on long touring routes to avoid lengthy shop waits after a bent or broken hanger. It's also well suited to shops and bike-coaching programs that service a fleet of road frames — the consistent fit and robust CNC construction make Dropout 138 a dependable spare for high-turnover maintenance work.

Key Features

  • ✓ Direct-fit replacement for Eddy Merckx, Norco, Pinarello, Stevens frames
  • ✓ CNC-machined 6061-T6 aluminum for strength and precise derailleur alignment
  • ✓ Black anodized finish resists corrosion from road conditions
  • ✓ Lightweight at approximately 0.05 lb — minimal added mass
  • ✓ Matches factory hole pattern and geometry for drop-in installation
  • ✓ Ideal spare for home toolkit, bike shop inventory, or travel kit

Specifications

Misc #138, Eddy Merckx, Norco, Pinavello, Stevens

Product Identifiers

Vendor Item # DROPOUT-138
UPC 836572006634

Frequently Asked Questions

How do I know this hanger will fit my frame?

Compare the shape, mounting hole pattern and part number (#138 / DROPOUT-138) on your current hanger to the product images and specs. If you’re unsure, email photos of your frame’s dropout to our tech team or bring the existing hanger to a local mechanic for confirmation.

What material is the Dropout 138 made from?

Dropout 138 is CNC-machined from 6061-T6 aluminum and finished with a black anodize. This combination offers a strong, lightweight part with good corrosion resistance for long-term use on road bikes.

Is installation difficult? Do I need special tools?

Installation is straightforward for anyone comfortable with basic bike maintenance: remove the rear wheel and derailleur attachment bolt, swap the hanger, then reattach and re-index the derailleur. A Torx or hex driver and a derailleur hanger alignment gauge (recommended) are the only specialty items that speed up precise setup.

Will replacing the hanger affect my shifting?

A correctly fitted Dropout 138 restores the original derailleur geometry and should return shifting to factory-accurate performance. You may need to fine-tune cable tension and limit screws after installation. If the frame was bent in a crash, have a mechanic check frame alignment first.

Should I carry a spare hanger on rides?

Yes — derailleur hangers are sacrificial and designed to bend or break to protect the frame and derailleur. Carrying a spare Dropout 138 is a low-weight insurance policy that can get you back on the road quickly after damage.

What if my hanger looks slightly different?

Even small differences in thickness, hole spacing or pocketing can prevent a proper fit. If your hanger deviates from the #138 profile, choose the exact match for your frame model. When in doubt, keep the old hanger as a template when ordering replacements.

Buying Guide

When replacing a derailleur hanger, the most important considerations are fit, material and ease of installation. Start by matching the part number or using the old hanger as a template — differences in hole spacing, thickness, or pocket geometry will prevent proper fit. Choose a CNC-machined aluminum hanger for a balance of weight and stiffness; for frames that see frequent impact, some riders prefer replaceable steel hangers where available. Keep a spare Dropout 138 in your toolkit or saddle bag if you ride aggressively or travel. Carrying the correct spare avoids shop downtime and keeps you rolling after a bent hanger. If you’re unsure about fit, our tech team can help verify compatibility with photos or frame serials.

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