Wheels Manufacturing DROPOUT-328

$47.50

In Stock

CNC-machined 6061 aluminum derailleur hanger with durable black anodize for frames using M12x1.5 thru-axles. Direct replacement for CO-OP Q28-4144-0; attaches with an M8 chainbolt (fastener not included).

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Product Details

Precision CNC 6061 Aluminum Construction

DROPOUT-328 is CNC machined from 6061-T6 aluminum for accurate geometry and consistent strength where it matters most. The black anodized finish adds corrosion resistance and a low-profile look that blends with modern mountain frames. The rigid machined profile preserves derailleur alignment under load so shifting stays crisp after installation, and the lightweight design (shipping weight ~0.0687 lb / ~31 g) keeps rotating mass to a minimum while offering proven durability for trail use.

Key Features & Real-World Benefits

Engineered for reliability: the precise CNC process ensures repeatable fit and alignment so your drivetrain performs optimally right out of the box. The anodized surface resists scratches and corrosion from weather and trail grime. • M12 x 1.5 thru-axle compatibility — made to work with frames that use this common thru-axle standard. • Attaches with (1) M8 chainbolt — simple, wide-thread mounting for secure fastening (fastener not included). • Direct CO-OP replacement — fits frames that used CO-OP part Q28-4144-0, making it an easy service swap.

Fit, Mounting & Compatibility

This hanger is designed to attach to compatible frames using a single M8 chainbolt into the frame's hanger boss. Note: the required M8 fastener is not included — use the original chainbolt or a correct replacement sized and graded for your frame. The DROPOUT-328 is intended for frames that use an M12x1.5 thru-axle and is a direct replacement for CO-OP part Q28-4144-0. Always compare the hanger outline and mounting interface with your old hanger before purchase to confirm fit — exact geometry matters for derailleur alignment.

Who This Hanger Is For

Trail riders, mechanics and shops who run mountain bikes with M12x1.5 thru-axles will appreciate this as a robust, OEM-style replacement. It's ideal for anyone upgrading a damaged or bent hanger, or keeping a spare on hand for remote rides. If you own a CO-OP-framed bike (or a frame using the Q28-4144-0 hanger pattern) this part provides a straightforward, high-quality swap. Home wrenchers will like the easy single-bolt install; shops will value the durable CNC build and consistent alignment it delivers.

Key Features

✓ CNC machined 6061-T6 aluminum for precise, repeatable alignment
✓ Durable black anodized finish resists corrosion and scuffs
✓ Designed for frames using M12 x 1.5 thru-axles
✓ Mounts with a single M8 chainbolt (fastener not included)
✓ Direct replacement for CO-OP part Q28-4144-0 for easy swaps
✓ Lightweight service part — shipping weight ~0.0687 lb (~31 g)
✓ Ideal spare for mountain riders and repair shops on the trail

Specifications

Misc

CO-OP

Product Identifiers

Vendor Item #	DROPOUT-328
UPC	811079024640

Frequently Asked Questions

Is the mounting bolt included with the hanger?

No — the DROPOUT-328 does not include the M8 chainbolt fastener. Use the original frame bolt if available or purchase a correctly sized M8 chainbolt rated for bicycle use.

Will this hanger fit my bike that uses an M12 thru-axle?

Yes — this hanger is designed for frames that use an M12 x 1.5 thru-axle. Confirm the hanger outline and single-bolt mounting pattern match your frame before ordering to ensure a direct swap.

Can I use this with Shimano or SRAM derailleurs?

Yes — the hanger supplies the same mounting interface as OEM hangers and works with standard derailleur mount patterns used by Shimano, SRAM and other major derailleur brands.

How tight should I torque the mounting bolt?

Torque to your frame manufacturer's recommended specification whenever possible. If that spec is unknown, many mechanics use a moderate range of approximately 8–10 Nm as a guideline — avoid overtightening to prevent thread or boss damage.

Is this an exact replacement for CO-OP part Q28-4144-0?

Yes — the DROPOUT-328 is made to replace CO-OP part Q28-4144-0. Still confirm visual match and mounting geometry with your original hanger to ensure compatibility.

What benefits does CNC aluminum offer over stamped hangers?

CNC 6061 offers tighter tolerances, more consistent geometry and a better strength-to-weight ratio than many stamped or cast alternatives. The result is improved shifting alignment and longer-lasting performance under the stresses of off-road riding.

Buying Guide

When choosing a replacement derailleur hanger, match the mounting pattern and axle standard precisely — geometry is critical for correct shifting. Look for materials and manufacturing methods (like CNC-machined 6061) that deliver consistent alignment and resist damage from trail impacts. Carry a spare hanger on long or remote rides; a broken hanger is a common cause of roadside mechanicals and swapping a spare is much faster than attempting field repairs. If you’re unsure about fit, compare the old hanger’s outline and bolt pattern, or contact your local shop for verification before purchasing.

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