Wheels Manufacturing Dropout 307
Dropout 307
Dropout 307
Wheels Manufacturing

Wheels Manufacturing Dropout 307

$40.50
In Stock

Wheels Manufacturing Dropout 307 is a CNC-machined replacement derailleur hanger for Niner RLT/ROS/SIR 9 steel frames with M12x1.75 thru-axles — precision fit and corrosion-resistant finish.

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Product Details

Overview & Technology

Wheels Manufacturing Dropout 307 is a direct-replacement derailleur hanger engineered for Niner RLT 9 Steel, ROS 9 Steel and SIR 9 Steel frames that use an M12x1.75 thru-axle. Designed to match OEM geometry, the #307 hanger restores derailleur alignment after impacts or hanger failure so you can get back on the trail without costly frame repairs. This hanger is CNC-machined from high-strength aluminum alloy (commonly 6061-T6) and finished with a corrosion-resistant anodize for durability in wet, gritty gravel conditions. At just 0.05 lb and stamped with the part number, it’s a lightweight, sacrificial part engineered to absorb damage and protect your frame and derailleur during a crash or hang-up.

Key Features & Benefits

Precision fit and dependable performance: The Dropout 307 mirrors Niner's OEM hanger geometry for correct shifting index and chainline restoration. Accurate CNC machining ensures repeatable fitment and bolt-hole alignment when replacing a damaged hanger. Real-world benefits include quick replacement in the shop or roadside, minimized drivetrain damage risk, and long-term corrosion resistance thanks to the anodized finish. The lightweight design won't compromise ride feel, while acting as the intended sacrificial component during impacts.

Fit, Compatibility & Installation

This hanger is specified as #307 and fits Niner frames listed as RLT 9 Steel, ROS 9 Steel and SIR 9 Steel that use an M12x1.75 thru-axle. Confirm your frame's OEM hanger number or compare your damaged hanger to the Dropout 307 outline before ordering. The product corresponds to Forest Bikes product SKU 270801 and Wheels Manufacturing part number DROPOUT-307. Installation is straightforward for a competent mechanic: remove the thru-axle and rear wheel, unbolt the broken hanger, fit the replacement aligning the mounting face and axle bore, torque to manufacturer spec and reinstall the wheel. If your original hardware is damaged, replace mounting bolts with OEM-specified fasteners for secure attachment.

Who This Hanger Is For

Gravel riders and commuters who own Niner RLT/ROS/SIR 9 steel frames and want a reliable OEM-fit replacement hanger will appreciate the Dropout 307. It’s ideal for bike shops stocking common OEM hangers and for riders who carry a spare on long gravel routes or bikepacking trips where a hanger failure can strand you. If you race gravel, commute year-round in mixed conditions, or maintain multiple Niner steel frames, keeping a Dropout 307 on hand is a small, inexpensive insurance policy that preserves shifting performance and saves you from more expensive repairs.

Key Features

  • ✓ Direct OEM-fit replacement for Niner RLT/ROS/SIR 9 steel frames
  • ✓ CNC-machined aluminum for accurate geometry and repeatability
  • ✓ Anodized finish for corrosion resistance in muddy or wet conditions
  • ✓ Specifically made for M12 x 1.75mm thru-axle rear dropouts
  • ✓ Lightweight sacrificial design protects frame and derailleur
  • ✓ Stamped #307 and matches Wheels Manufacturing part DROPOUT-307
  • ✓ Ideal spare for shops, racers, and remote gravel rides

Specifications

Misc #307, Niner M12x1.75 Thru Axle

Product Identifiers

Vendor Item # DROPOUT-307
UPC 811079024350

Frequently Asked Questions

How do I know if this hanger fits my frame?

Check your frame’s OEM hanger number (usually stamped or listed in the frame manual) or compare the shape and axle bore to your existing hanger. The Dropout 307 fits Niner RLT 9 Steel, ROS 9 Steel and SIR 9 Steel frames that use an M12x1.75 thru-axle.

What material is the Dropout 307 made from?

This hanger is CNC-machined from a high-strength aluminum alloy (typical industry standard 6061-T6) and finished with a corrosion-resistant anodize. The material provides a balance of strength and intentional sacrificial behavior in a crash.

Will I need special tools to install it?

Installation requires basic bike tools: a torque wrench, appropriate hex/torx driver for the mounting bolts, and wheel removal tools for the M12 thru-axle. No specialty tools are required, but follow torque specs to avoid over-tightening.

Does this hanger include mounting hardware?

Hardware inclusion varies by supplier; verify in the product listing. If your original mounting bolts were damaged in the incident, replace them with OEM-spec bolts to ensure proper seating and safety.

Can I straighten a bent hanger instead of replacing it?

Light bends can sometimes be straightened carefully, but repeated straightening weakens the part. Because hangers are designed to be sacrificial, replacement is recommended for reliable shifting and structural integrity.

Is this hanger compatible with all derailleurs?

The Dropout 307 is compatible with standard rear derailleurs that mount to a threaded hanger interface used on the listed Niner frames. Always check derailleur cage clearance and drivetrain setup (max cog size) after installation.

Buying Guide

When buying a replacement derailleur hanger, match the OEM hanger number or compare the hanger's outline to ensure correct geometry. Choose a hanger machined from high-strength aluminum with a corrosion-resistant finish for the best balance of durability and sacrificial protection. Keep fitment details handy: axle thread size (here M12x1.75), frame model compatibility, and whether your frame uses an integrated or bolt-on hanger. If you ride remote gravel routes, buy an extra hanger to carry with your spares kit — it’s a small investment that prevents a single crash from ending your ride.

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