Wheels Manufacturing Dropout 25
Dropout 25
Dropout 25
Wheels Manufacturing

Wheels Manufacturing Dropout 25

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Precision CNC-machined derailleur hanger for Kona frames (Wheels Mfg Dropout 25). 6061-T6 aluminum with black anodize and included M8 bolt for secure installation.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 25 is a direct-replacement derailleur hanger engineered for Kona frames that use the #25 dropout. CNC machined from 6061-T6 aluminum, this hanger delivers a consistent, lightweight platform that restores alignment and keeps your drivetrain shifting cleanly. Black anodized for corrosion resistance and a durable finish, the Dropout 25 ships with (1) M8 chainring bolt included for straightforward installation. The precision machining and tight tolerances reduce slop between the frame and derailleur to improve indexing and reduce wear on drivetrain components.

Key Features & Benefits

Material and build: Machined from 6061-T6 aluminum for a balance of strength, weight savings, and predictable deformation in a crash. The black anodized surface increases abrasion and corrosion resistance while retaining a clean, low-profile look. • Precision CNC machining ensures repeatable alignment and a snug fit against the frame. • Included M8 chainring bolt simplifies installation — no extra hardware required. • Compact shipping size and featherweight construction make it an easy spare to carry on rides.

Fit, Compatibility & Installation

The Dropout 25 is listed as Wheels Manufacturing hanger #25 and is tailored to fit Kona frames that accept that specific hanger shape. Before ordering, compare the silhouette of your current hanger or check your frame documentation to confirm it matches the #25 profile. Installation is straightforward: remove the damaged hanger, align the Dropout 25 to the frame mounting boss, and fasten using the supplied M8 bolt. Tighten to your frame/derailleur manufacturer's torque specification — typical chainstay hanger bolts run around 6–8 Nm; always verify with the frame manual. If the hanger or threads are damaged, consult a professional mechanic to avoid compromising frame integrity.

Who This Hanger Is For

Designed for mountain riders and mechanics who need an exact-fit replacement for Kona frames that use the Wheels Manufacturing #25 dropout. It's ideal for riders who want a lightweight, durable spare that restores derailleur alignment after impact or wear. If you frequently ride rough trails, race, or maintain multiple Kona builds, the Dropout 25 is a high-value spare that helps you get back on the trail quickly with minimal fuss.

Key Features

  • ✓ CNC-machined 6061-T6 aluminum for strength and precision
  • ✓ Black anodized finish for corrosion and abrasion resistance
  • ✓ Includes one M8 chainring bolt for immediate installation
  • ✓ Exact-fit replacement for Wheels Manufacturing hanger #25
  • ✓ Lightweight, compact design — easy to carry as a spare
  • ✓ Precision tolerances improve shifting performance and indexing
  • ✓ Durable construction designed to deform predictably in impacts

Specifications

Misc #25, Multiple M

Product Identifiers

Vendor Item # DROPOUT-25
UPC 836572004449

Frequently Asked Questions

How do I know this hanger fits my frame?

The Dropout 25 corresponds to Wheels Manufacturing hanger #25 and is made to match Kona frames that use that specific hanger profile. Compare the shape and mounting hole pattern of your current hanger or check your frame's parts documentation. If unsure, take a clear photo of your existing hanger and compare it to the product images or contact our tech team for help.

Can I install this myself at home?

Yes — installation is generally straightforward for anyone comfortable with basic bike maintenance. Remove the damaged hanger, align the new hanger on the frame boss, insert the supplied M8 bolt, and tighten to the manufacturer's torque specification. If threads or the mounting boss are damaged, have a professional mechanic inspect the frame.

What torque should I use to tighten the hanger bolt?

Always follow your frame or derailleur manufacturer's recommended torque. A common guidance for hanger bolts is about 6–8 Nm, but this can vary. Using a calibrated torque wrench prevents over-tightening and potential damage to the frame or bolt.

Is the included M8 bolt compatible with my existing hardware?

The Dropout 25 ships with a single M8 bolt intended for the hanger mounting on compatible Kona frames. If your frame or mounting system uses a different fastener or requires threadlocker/washer specifics, use the hardware specified by your frame manufacturer.

Can a derailleur hanger be bent back into shape instead of replaced?

Minor bends can sometimes be realigned, but repeated bending weakens the metal and can compromise shifting accuracy. For hangers that are visibly cracked, heavily distorted, or if shifting issues persist after straightening, replacement is recommended. The Dropout 25 provides a like-for-like, reliable replacement.

What materials and finishes are used on this hanger?

This hanger is CNC machined from 6061-T6 aluminum and finished with a black anodize. That combination delivers good fatigue resistance, light weight, and an abrasion-resistant surface that helps resist corrosion from trail conditions.

Buying Guide

When choosing a derailleur hanger, the most important factor is an exact match to your frame's mounting geometry. Hangers are small but critical: the wrong silhouette or hole spacing will cause improper alignment and poor shifting. Always verify the hanger number (Wheels Manufacturing #25 for this product) or match the existing unit visually. Consider carrying a spare hanger like the Dropout 25 on long rides if you frequently tackle rocky or technical terrain. Lightweight and compact, a spare hanger lets you make a quick replacement trail-side and get home without a long walk or costly shuttle.

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