Wheels Manufacturing Dropout 309
Dropout 309
Dropout 309
Wheels Manufacturing

Wheels Manufacturing Dropout 309

$37.50
In Stock

Direct-fit replacement derailleur hanger #309 for most 2014–18 Scott Scale, Genius and Contessa frames with 12x148mm thru-axle. CNC-style alloy construction, exact OEM fit for reliable shifting.

Add to Cart
🚚 Fast Shipping 🔒 Secure Checkout ↩ Easy Returns

Product Details

Overview & Technology

Wheels Manufacturing Dropout 309 is a direct-fit replacement derailleur hanger designed to restore precise shifting on most 2014–2018 Scott Scale, Genius and Contessa frames that use a 12x148mm thru-axle (Boost) system. Manufactured to Wheels Manufacturing's tight tolerances and listed as part number DROPOUT-309 (product number 270803), this hanger replaces the factory part and keeps your drivetrain tracking true after accidental damage or wear. The hanger is CNC-machined from high-grade aluminum and finished with a corrosion-resistant coating for durability and light weight (shipping weight about 0.1 lb). Its OEM-compatible geometry preserves derailleur alignment and dropout spacing so you don't need adjustments to derailleur cage length or hanger-to-dropout interfaces.

Key Features & Benefits

Precision fit: Engineered as a one-to-one replacement for hanger #309, maintaining factory derailleur position and chainline. Real-world benefit: Quick, tool-friendly swap gets you back on the trail with factory shifting performance — no guesswork, no trial-and-error shims. • OEM match for Scott 2014–2018 Scale, Genius, Contessa frames • Designed for 12x148mm thru-axle (Boost) dropouts • CNC-machined aluminum for strength, lightness and repeatable alignment • Corrosion-resistant finish for long life in wet and muddy conditions • Compact shipping size and low weight: approx. 0.1 lb

Fit, Compatibility & Installation Notes

This hanger fits most Scott Scale, Genius and Contessa frames from 2014 through 2018 equipped with a 12mm thru-axle and 148mm spacing (Boost). Verify compatibility by checking your frame's hanger shape against the #309 image or cross-referencing your bike's OEM part number. If your bike uses a bolt-on hanger or a different thru-axle diameter/spacing, this part will not be compatible. Installation is straightforward: remove the rear wheel and old hanger, clean the mounting surface, install the new hanger using the existing hanger bolt(s), and torque to the manufacturer's spec. A derailleur hanger alignment gauge is recommended after installation to confirm true alignment before riding. Note: wheels and axle endcaps must match a 12x148mm configuration; this hanger is not intended for 12x142 or non-Boost spacing.

Who This Hanger Is For

Trail riders, racers and home mechanics who own a compatible Scott Scale, Genius or Contessa frame will find this an essential spare. It's ideal for anyone who wants a fast, reliable replacement that restores OEM shifting geometry after a crash or bent hanger. Bike shops and mechanics benefit from stocking the Dropout 309 as a common repair item for 2014–2018 Scott Boost models — lightweight, affordable and quick to swap during service or roadside repairs.

Key Features

  • ✓ Direct OEM-style replacement for Wheels Manufacturing Dropout #309
  • ✓ Fits most 2014–2018 Scott Scale, Genius and Contessa frames
  • ✓ Specifically designed for 12x148mm (Boost) thru-axle dropouts
  • ✓ CNC-machined aluminum body for precise alignment and light weight
  • ✓ Corrosion-resistant finish for durability in wet, muddy conditions
  • ✓ Easy install—uses original hanger bolt and factory mounting points
  • ✓ Small, lightweight spare: approx. 0.1 lb and compact shipping size

Specifications

Misc #309, Scott 12mm Thru Axle

Product Identifiers

Vendor Item # DROPOUT-309
UPC 811079024374

Frequently Asked Questions

Will this hanger fit my Scott Scale/Genius/Contessa?

This hanger is a direct replacement for most 2014–2018 Scott Scale, Genius and Contessa frames that use a 12x148mm thru-axle (Boost). Verify by matching the hanger shape to your existing part or confirming your bike's OEM hanger number equals #309.

What material is the Dropout 309 made from?

The Dropout 309 is CNC-machined from high-grade aluminum with a corrosion-resistant finish. This construction balances strength, weight savings and consistent derailleur alignment under normal trail conditions.

Does this hanger include mounting hardware?

Hangers like this typically install using the original hanger bolt(s) from your frame. Wheels Manufacturing parts sometimes ship without additional bolts; check the product listing or your box contents. If unsure, keep the original hardware or purchase OEM replacement hanger bolts.

How do I know if my hanger is bent or needs replacement?

Common signs include poor shifting, the derailleur rubbing the cassette, or visible misalignment after a tip-over or crash. Use a derailleur hanger alignment gauge for a definitive check — if it's out of spec, replacement is the safest option.

Can I use this hanger with different axle sizes or adapters?

No. This hanger is designed for frames with a 12x148mm thru-axle. Using it with 12x142 or other spacing may not seat correctly and can cause misalignment. Ensure your frame/dropout matches the 12x148 Boost standard before purchasing.

Do I need a professional to install it?

A competent home mechanic can replace the hanger with basic tools, but recalibrating derailleur alignment and checking hanger straightness with an alignment gauge is recommended. If you lack the tools or experience, a bike shop can install and align it quickly.

Buying Guide

When buying a derailleur hanger, the first rule is: match the hanger to your frame. Look for the OEM part number, year, and axle spacing — this Dropout 309 is built for Scott Boost frames (12x148mm) from 2014–2018. Choose a hanger made from durable, CNC-machined materials (aluminum is common) to ensure repeatable alignment and a good balance of strength and weight. Keep a spare hanger on hand if you ride aggressively or travel to remote trails. Also consider having a hanger alignment gauge in your toolbox or asking your local shop to check alignment after installation; correct alignment is essential for crisp shifting and drivetrain longevity.

Ready to order?

Shop with confidence at Scenders — premium cycling parts, fast shipping.

View Full Product