Wheels Manufacturing Dropout 303
Dropout 303
Dropout 303
Wheels Manufacturing

Wheels Manufacturing Dropout 303

$46.50
In Stock

Precision CNC replacement derailleur hanger for Cannondale 12x1.0 thru‑axle frames. Direct‑fit #303 for 2016 Beast of the East, 2016+ Slate and 2017+ Pivot.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 303 is a precision replacement derailleur hanger engineered as a direct-fit spare for select Cannondale and Pivot frames that use a 12x1.0mm thru‑axle setup. Manufactured to Wheels Mfg's exacting tolerances, the #303 restores factory alignment and preserves derailleur geometry after a crash or hanger failure. The hanger is CNC‑machined from high‑strength 6061‑T6 aluminum and finished with a hard‑coat anodize to resist corrosion and abrasion. Its exact dimensions match OEM mounting points to ensure smooth shifting and consistent drivetrain performance without the need for frame modification.

Key Features

Durable construction: CNC‑machined 6061‑T6 aluminum offers excellent strength‑to‑weight balance and predictable deformation in a crash. Hard‑coat anodizing helps protect against the elements and road grime. Precision fit & alignment: Engineered to the same geometric specifications as the original, the Dropout 303 locks the rear derailleur into the correct position for crisp indexing and long chain life. Compact shipping size and light weight make it a great spare to carry on rides.

Fit & Compatibility

This Dropout 303 is designed specifically for frames using a Cannondale 12x1.0mm thru‑axle configuration. Confirm fit for these models: 2016 Beast of the East with M12x1 TA, 2016+ Cannondale Slate, and 2017+ Pivot frames. The product corresponds to Wheels Manufacturing part #303 (Manufacturer Part #: DROPOUT-303, Product Number: 270799). Because derailleur hanger designs vary by model year and axle type, always verify your frame's hanger number or compare the old hanger before ordering. If your bike uses a different axle standard or hanger shape, this part will not fit.

Who It's For

Mountain bikers who own compatible Cannondale or Pivot frames and want a reliable OEM‑style replacement will appreciate the Dropout 303. It's ideal for trail riders, bike mechanics, and touring riders who carry a spare hanger to avoid being stranded after a crash or bend. Enthusiasts who value quick, accurate repairs and consistent shifting performance will find this hanger an inexpensive way to maintain drivetrain function and protect expensive derailleurs from damage caused by misalignment.

Key Features

  • ✓ Direct‑fit replacement for Cannondale 12x1.0mm thru‑axle frames
  • ✓ CNC‑machined from high‑strength 6061‑T6 aluminum for durability
  • ✓ Hard‑coat anodized finish resists corrosion and wear
  • ✓ Matches OEM geometry to preserve derailleur alignment
  • ✓ Compatible with 2016 Beast of the East, 2016+ Slate, 2017+ Pivot
  • ✓ Compact spare — ships 2" x 1" x 0.45", weighs 0.1 lb
  • ✓ Wheels Manufacturing part #303 (Manufacturer Part #: DROPOUT-303)

Specifications

Misc #303, Cannondale 12x1.0 Thru Axle

Product Identifiers

Vendor Item # DROPOUT-303
UPC 811079024312

Frequently Asked Questions

How do I know if Dropout 303 fits my bike?

Check your frame's existing hanger number or compare the shape and mounting points to the Dropout 303. This hanger fits frames with a Cannondale 12x1.0mm thru‑axle — specifically 2016 Beast of the East (M12x1 TA), 2016+ Slate, and 2017+ Pivot models.

What material is the hanger made from?

The Dropout 303 is CNC‑machined from 6061‑T6 aluminum and finished with a hard‑coat anodize for corrosion resistance and long service life.

Can I install this myself or need a shop?

If you’re comfortable removing the rear wheel and working around the derailleur, you can install it yourself with standard hex tools. Ensure the hanger is torqued to the frame manufacturer's spec and check derailleur alignment after installation. If unsure, a bike shop can install and index the drivetrain for you.

Will this hanger affect my shifting performance?

When installed correctly, the Dropout 303 restores OEM geometry and should return shifting to factory performance. Bent or mismatched hangers cause poor indexing — replacing with the correct model is the first step toward crisp shifting.

Does it include mounting hardware?

Wheels Manufacturing hangers sometimes ship with mounting hardware, but availability varies. Verify the product listing on the Forest Bikes page or contact customer service if hardware is required and not listed.

Is this hanger compatible with thru‑axles of different thread pitches?

No. This hanger is specified for a Cannondale 12x1.0mm thru‑axle. Using a different axle standard or thread pitch may prevent proper fitment and can damage the frame or axle.

Buying Guide

When buying a replacement derailleur hanger, prioritize an exact match to your frame’s hanger number and axle standard. Look for CNC‑machined hangers made from 6061‑T6 aluminum with corrosion‑resistant finishes — these provide predictable performance and controlled deformation in a crash. Always verify compatibility (model year and thru‑axle size), and consider carrying a spare hanger if you ride remote trails. If you’re unsure, bring your old hanger or frame details to Forest Bikes’ support team for help selecting the correct part.

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