Wheels Manufacturing DROPOUT-339

$32.50

In Stock

CNC-machined 6061 aluminum derailleur hanger for Norco frames. Black anodized, two-bolt design; lightweight, precise replacement for Norco #913000-001.

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Product Details

Overview & Technology

DROPOUT-339 is a precision CNC-machined replacement derailleur hanger made from 6061 aluminum with a hard black anodized finish. Manufactured by Wheels Manufacturing to tight tolerances, this hanger restores derailleur alignment and shifting performance when your original Norco hanger is bent or damaged. The 6061 alloy and CNC process deliver a stiff but slightly sacrificial part that protects the frame and drivetrain in a crash. The anodized surface improves corrosion resistance and reduces wear at the mounting interface, while the compact, true-to-spec profile matches the Norco mounting footprint for a clean fit.

Key Features & Benefits

Solid construction: CNC-machined from 6061 aluminum for predictable bending characteristics in impacts and consistent alignment for smooth shifting. Durable finish and fit: Black anodized to resist corrosion and marring; designed to replace Norco part #913000-001 and attach with two M4x8 flat head screws (fasteners not included). • Exact replacement geometry for Norco frames using the 2-bolt mount. • Lightweight — nominal weight ~0.05 lb — so it won’t affect bike handling. • Precision hole placement keeps derailleur alignment within spec to reduce chain drop and wear.

Fit & Compatibility

This hanger is intended as a direct replacement for Norco frames that use the Norco part number 913000-001. It mounts with two M4x8 flat head screws into the frame's integrated hanger boss. Always verify the frame's hanger shape and hole spacing against the DROPOUT-339 drawing or your old hanger before purchase. If your frame's threads are damaged, you may need thread repair inserts or to consult a bike shop. Fasteners are not included; use the correct length M4x8 flat head screws and tighten to your frame manufacturer's torque specification to avoid stripping or over-stressing the boss.

Who This Hanger Is For

Mountain riders who own Norco frames and need an OEM-fit replacement will appreciate the DROPOUT-339. It's ideal for trail, all-mountain and cross-country riders who value a precise, durable hanger that restores shift performance after a crash or wear. Also great as a lightweight spare to carry on rides — the small dimensions and low weight make it easy to stash in a pack or saddle bag so you can get home after a bent-hanger incident.

Key Features

✓ CNC-machined 6061 aluminum for consistent strength and predictable bending
✓ Black anodized finish improves corrosion resistance and reduces wear
✓ Two-bolt mounting using M4x8 flat head screws (fasteners not included)
✓ Direct replacement for Norco part number 913000-001
✓ Lightweight at approximately 0.05 lb — easy to carry as a spare
✓ Precision hole placement restores derailleur alignment and shifting

Specifications

Misc

Norco

Product Identifiers

Vendor Item #	DROPOUT-339
UPC	811079024886

Frequently Asked Questions

Will this hanger fit my Norco frame?

DROPOUT-339 is designed as a direct replacement for Norco part #913000-001. Confirm your old hanger’s shape and hole spacing match this two-bolt configuration before ordering. If in doubt, compare the part number on your original hanger or check with your local bike shop.

Are the mounting screws included?

No — fasteners are not included. The hanger attaches with two M4x8 flat head screws. Use the correct length screws and tighten them to your frame manufacturer's recommended torque to avoid damaging threads.

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

This hanger is CNC-machined from 6061 aluminum, chosen for its balance of strength, light weight, and predictable sacrificial behavior in impacts. A properly designed aluminum hanger will bend or break to protect the frame and drivetrain during a crash.

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

Minor bends can sometimes be straightened, but it's critical the hanger returns to true alignment. For reliable shifting and to avoid recurring issues, replacing the hanger with a precision CNC part like DROPOUT-339 is often the best choice.

What if my frame’s threads are stripped?

If the frame boss threads are damaged, installing a new hanger may require thread repair, helicoil inserts, or a visit to a professional mechanic. Do not overtighten new screws; follow manufacturer torque specs to prevent further damage.

Buying Guide

When buying a replacement derailleur hanger, prioritize exact fit and material quality. Match the hanger's mounting pattern and hole spacing to your frame or part number — a close fit ensures correct derailleur alignment and prevents drivetrain wear. CNC-machined 6061 aluminum hangers offer reliable performance across a range of mountain riding conditions. Also consider carrying a spare hanger on multi-day rides or remote trails. Check for included fasteners; if none are supplied, purchase the correct M4x8 flat head screws and use medium-strength threadlocker or follow the frame maker’s torque specs during installation.

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