Wheels Manufacturing Dropout 159
Dropout 159
Dropout 159
Wheels Manufacturing

Wheels Manufacturing Dropout 159

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Precision replacement derailleur hanger for select Cannondale frames. CNC-machined for accurate shifting alignment and durability—easy swap with OEM fit.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 159 (DROPOUT-159, 270434) is a direct-fit replacement derailleur hanger designed specifically for select Cannondale frames. Built to restore factory alignment after a crash or bend, this hanger is engineered for precise indexing and reliable shifting performance. Manufactured to tight tolerances, the Dropout 159 is CNC-machined from high-strength aluminum alloy and finished for corrosion resistance. The compact design and accurate mounting surfaces replicate OEM geometry so your rear derailleur returns to the correct position without frame modification.

Key Features

This hanger focuses on the essentials: durability, dimensional accuracy, and straightforward installation. The CNC machining ensures repeatable geometry while a protective finish helps it resist road and trail contaminants. • Precision CNC construction: tight tolerances for accurate derailleur alignment and shift performance. • Durable aluminum alloy: lightweight yet strong, built to absorb impact and protect the frame. • Corrosion-resistant finish: hard-anodized or similar protective coating for long-term durability. • OEM-compatible fit: replicates Cannondale mounting points for a true replacement. The Dropout 159 is a no-fuss part—small, reliable, and designed to get you back on the road quickly.

Fit & Compatibility

The Dropout 159 is listed as #159 for Cannondale and matches the original Cannondale derailleur dropout geometry. Check your frame’s hanger number or OEM parts list to confirm compatibility—this is essential because Cannondale uses several different hanger profiles across models and years. Installation uses the same mounting points as the original part; depending on your frame, stainless steel mounting hardware may be included or you can reuse OEM bolts. Always verify alignment after installation with a hanger alignment gauge or by checking shifting across the cassette.

Who It's For

This hanger is ideal for road cyclists and commuter riders who own a Cannondale frame that specifies hanger #159. If you’ve bent or lost the original hanger in a tip-over or crash, the Dropout 159 is an affordable, accurate replacement that restores shifting and protects your frame from further damage. Mechanics, home wrenchers, and bike shops will appreciate the straightforward drop-in fit and robust construction—keep one in your parts drawer or pack it for long-distance rides as a spare.

Key Features

  • ✓ Direct-fit replacement for Cannondale frames listed as hanger #159
  • ✓ CNC-machined aluminum for repeatable, accurate derailleur alignment
  • ✓ Protective anodized finish resists corrosion and trail grime
  • ✓ Lightweight design minimizes added weight while maximizing strength
  • ✓ Restores OEM geometry for smooth, consistent shifting performance
  • ✓ Compact, serviceable part—easy to carry as a roadside spare
  • ✓ Manufacturer part number DROPOUT-159 / internal SKU 270434

Specifications

Misc #159, Cannondale

Product Identifiers

Vendor Item # DROPOUT-159
UPC 836572007761

Frequently Asked Questions

How do I confirm this hanger fits my Cannondale frame?

Check your frame’s parts list or owner manual for hanger number #159, or compare the shape and mounting hole pattern to your existing hanger. If unsure, send a photo of your current hanger or frame dropout to Forest Bikes support for confirmation.

Is mounting hardware included with the Dropout 159?

Many Wheels Manufacturing hangers ship with the necessary stainless steel mounting bolt(s), but hardware availability can vary. If hardware is not included, reuse your OEM bolt or purchase a compatible M5/M6 stainless bolt—tighten to the frame manufacturer torque spec.

What material is the hanger made from and why does that matter?

The Dropout 159 is CNC-machined from a high-strength aluminum alloy (commonly 6061-T6) and finished for corrosion resistance. Aluminum offers a balance of light weight and controlled failure characteristics—designed to bend or shear to protect the frame and derailleur in a crash.

Can I align the hanger myself after installing it?

Minor checks can be done visually, but for precise alignment use a derailleur hanger alignment gauge or have a shop check it. Incorrect alignment will cause poor indexing and premature drivetrain wear.

What should I do if the hanger bends again after replacement?

If it bends repeatedly in the same incident type, inspect for frame damage or misaligned dropouts. Recurrent bends may indicate underlying damage—have a qualified mechanic examine the frame and derailleur hangar attachment area.

Is this an OEM Wheels Manufacturing part or made for Wheels Manufacturing?

This is a Wheels Manufacturing produced hanger (DROPOUT-159) designed to replicate Cannondale’s OEM fit and function. Wheels Manufacturing specializes in precision aftermarket hangers compatible with many frame brands and models.

Buying Guide

Choosing the correct derailleur hanger starts with identifying the hanger number stamped by the frame manufacturer or matching the physical shape and bolt pattern to your old hanger. Always verify compatibility—Cannondale uses multiple hanger profiles across model years, and the Dropout 159 is specific to frames that list hanger #159. Carry a spare hanger on long rides or in your repair kit: they’re compact, lightweight, and can save a ride after a tip-over. When replacing a hanger, inspect the derailleur and dropout for hidden damage, use proper stainless mounting hardware, and check alignment for smooth, reliable shifting.

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