Wheels Manufacturing Dropout 164
Dropout 164
Dropout 164
Wheels Manufacturing

Wheels Manufacturing Dropout 164

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Direct-fit DROPOUT-164 derailleur hanger for select Trek frames. CNC-machined alloy construction provides precise alignment, lightweight strength, and easy bolt-on replacement.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 164 (DROPOUT-164) is a direct-fit derailleur hanger manufactured as a like-for-like replacement for select Trek frames. Designed and produced by Wheels Manufacturing, this hanger matches the OEM geometry so your derailleur alignment and shifting performance are restored without frame modification. Precision matters when it comes to shift performance. The Dropout 164 is CNC-machined from a heat-treated aluminum alloy for consistent tolerances, then finished to resist corrosion and wear. The compact design keeps weight minimal while maintaining the structural integrity needed to protect your drivetrain in a crash or impact.

Key Features

Built for accurate, reliable shifting. The Dropout 164 is produced to match the factory mounting points and hanger profile of the OEM Trek part #164 so installation is straightforward and alignment is maintained. • Direct-fit replacement: OEM-style fit for Trek frames using hanger #164. • CNC-machined aluminum alloy: Heat-treated for strength and precise tolerances. • Lightweight: Tiny shipping weight (~0.03 lb) and compact footprint. • Durable finish: Corrosion-resistant surface treatment to withstand road and seasonal conditions. • Part numbers: Wheels Manufacturing Product 270438, Manufacturer Part # DROPOUT-164.

Fit & Compatibility

This hanger is specifically listed as #164 for Trek — check your bike's parts list, frame stamping, or existing hanger shape to confirm compatibility. Because derailleur hangers are frame-specific, matching the hanger number or comparing the physical shape is the most reliable method to confirm fit. If you're replacing a bent or broken hanger, compare the bolt pattern and the dropout interface. The Dropout 164 is a bolt-on replacement that uses the same mounting hardware and hole spacing as the original Trek part. If you have any doubt, provide your frame model and year to our fit specialists or compare photos to ensure an exact match.

Who It's For

Any road cyclist who rides a Trek frame that requires hanger #164 will benefit from this direct-fit replacement. It's ideal for mechanics, home wrenchers, and shop techs who need a reliable, OEM-style hanger to restore shifting after an impact or as a preventive spare. The Dropout 164 is also a smart item to carry on long rides or include in a workshop inventory — derailleur hangers are sacrificial components designed to save your derailleur and frame from damage. Keeping the correct spare can get you back on the road quickly after a crash or mishap.

Key Features

  • ✓ Direct-fit replacement for Trek frames using hanger #164
  • ✓ CNC-machined heat-treated aluminum alloy for precise tolerances
  • ✓ OEM-style geometry restores factory derailleur alignment
  • ✓ Lightweight, compact design with corrosion-resistant finish
  • ✓ Matches Wheels Manufacturing part 270438 / DROPOUT-164
  • ✓ Easy bolt-on installation using original mounting hardware
  • ✓ Small shipping size; ideal as a workshop or on-bike spare

Specifications

Misc #164, Trek

Product Identifiers

Vendor Item # DROPOUT-164
UPC 836572008690

Frequently Asked Questions

How do I know if Dropout 164 fits my Trek bike?

Verify your frame's hanger number (often stamped on the hanger) or compare the existing hanger's shape and bolt pattern to photos of the Dropout 164. You can also check your bike's parts list or provide frame model and year to our fit specialists for confirmation.

Is this hanger made from aluminum or steel?

The Dropout 164 is CNC-machined from a heat-treated aluminum alloy. This gives a strong, lightweight part with precise tolerances that match OEM geometry while remaining sacrificial in the event of a crash.

Does the hanger come with mounting hardware?

Hangers often install using the frame's original bolt or screw. Unless specifically listed, replacement hangers may not include mounting hardware. Check the product listing or contact us if you need replacement bolts or pins for your frame.

Can I bend a hanger back into alignment?

Minor bends can sometimes be straightened, but precision alignment tools are recommended. For best shifting performance and safety, replace visibly damaged hangers—this Dropout 164 is an inexpensive direct-fit replacement.

What should I do after installing the new hanger?

After installing, mount the derailleur, set limit screws, and run the rear derailleur through the gears to ensure smooth indexing. Use a derailleur hanger alignment gauge if available to confirm perfect alignment with the wheel.

How quickly will this part ship given its dimensions?

The Dropout 164 is compact (approx. 3" x 3" x 0.3") and lightweight (0.03 lb), so it typically ships quickly and is inexpensive to mail. Shipping times depend on your chosen service and destination.

Buying Guide

When buying a derailleur hanger, fit is paramount — hangers are frame-specific components. Confirm the hanger number or verify the bolt pattern and profile against your existing part. Direct-fit replacements like the Wheels Manufacturing Dropout 164 restore factory geometry without frame modification. Consider material and manufacturing: CNC-machined aluminum hangers offer precise tolerances and reliable sacrificial protection for your derailleur. If you frequently ride rough roads or race, keep a spare in your toolkit to avoid long delays after a bent hanger.

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