{"id":4543,"date":"2026-10-25T20:00:20","date_gmt":"2026-10-26T04:00:20","guid":{"rendered":"https:\/\/al-forging.com\/products\/bicycle\/dropout-hangers\/"},"modified":"2026-10-28T20:29:48","modified_gmt":"2026-10-29T04:29:48","slug":"forged-bicycle-dropouts","status":"publish","type":"page","link":"https:\/\/al-forging.com\/es\/forged-bicycle-dropouts\/","title":{"rendered":"Forged Bicycle Dropouts & Derailleur Hangers"},"content":{"rendered":"
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BICYCLE FRAME INTERFACES \u00b7 FORGED + CNC<\/p>\n

Forged bicycle dropouts and derailleur hangers.<\/h1>\n

Rear dropouts, derailleur hangers and frame hangers \u2014 closed-die forged in 6061-T6 and 7075-T6, then CNC-machined to the alignment tolerances that shifting precision depends on.<\/p>\n

\n Send a Drawing<\/a>
\n Part Families<\/a>\n <\/div>\n
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\u00b10.01 mm<\/b>machined per drawing<\/span><\/div>\n
99.7%<\/b>first-pass yield<\/span><\/div>\n
300\u20132500T<\/b>press range<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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\"Forged<\/figure>\n<\/div>\n<\/div>\n<\/section>\n
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WHY FORGED<\/p>\n

Dropouts are small. Their job is not.<\/h2>\n
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A dropout carries the wheel load, braces the frame end under braking and, on derailleur bikes, sets the plane your gears hang from. Machining these shapes from plate leaves the grain cut across the highest-stress sections \u2014 exactly where forged parts keep it flowing:<\/p>\n

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1. Grain follows the load path<\/h3>\n

Closed-die forging compresses the grain along the dropout’s curve and around the axle slot, so the part resists bending and fatigue the way a machined plate part cannot.<\/p>\n<\/div>\n

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2. Hanger alignment stays put<\/h3>\n

Derailleur hangers are alignment-critical to fractions of a millimetre. Forging near-net, then machining the face and thread interface, gives a stable datum that survives years of wheel changes.<\/p>\n<\/div>\n

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3. No porosity at the weld zone<\/h3>\n

Forged dropouts weld or bolt to the frame without the porosity risk of cast equivalents \u2014 important where the frame end is joined in a fillet weld.<\/p>\n<\/div>\n

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4. Frame-specific, batch-friendly<\/h3>\n

Every frame geometry needs its own dropout. Our in-house die shop and press range are set up for multi-SKU programs, so a family of sizes does not mean a family of tooling bills.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

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\"Forged<\/figure>\n

Programs we support: road \u00b7 gravel \u00b7 MTB hardtail & full-sus \u00b7 e-bike frames \u00b7 cargo bikes \u00b7 single-speed & track<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<\/section>\n

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PART FAMILIES<\/p>\n

What we forge for frame-end programs<\/h2>\n
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Rear dropouts<\/h3>\n
Axle slots forged to your geometry<\/span>6061-T6 \/ 7075-T6, CNC-finished<\/span>Weld-in or bolt-on designs<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Derailleur hangers<\/h3>\n
Replaceable hanger interfaces<\/span>Face, bore and thread machined square<\/span>Frame-specific, small-batch friendly<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Frame hangers<\/h3>\n
Custom connection geometry<\/span>For cable stops, racks and stays<\/span>Anodised or as-forged finish<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Suspension link ends<\/h3>\n
Dropout-side link plates<\/span>Bearing bores machined after forging<\/span>Paired left \/ right matched sets<\/span><\/div>\n<\/p><\/div>\n<\/div><\/div>\n<\/div>\n<\/section>\n
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ENGINEERING<\/p>\n

Built to the tolerances shifting demands<\/h2>\n
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Requirement<\/th>\nHow XPF meets it<\/th>\n<\/tr>\n<\/thead>\n
Alignment<\/th>\nHanger face and bore machined square to the dropout datum; \u00b10.01 mm features per drawing review<\/td>\n<\/tr>\n
Materials<\/th>\n6061-T6 standard; 7075-T6 where stiffness and thread strength matter; mill certificate per alloy batch<\/td>\n<\/tr>\n
Standards<\/th>\nFrame-interface geometries produced to your ISO 4210-derived specs \u2014 we build to your drawing, not to a catalogue<\/td>\n<\/tr>\n
Validation<\/th>\nCMM dimensional reports, hardness and spectrometer testing; PPAP \/ FAI documentation on request<\/td>\n<\/tr>\n
Finish<\/th>\nAnodising Type II \/ III, sandblast or as-forged \u2014 colour matched to your frame spec<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Already machining dropouts from solid? The CNC-to-forging conversion<\/a> page shows the honest cost crossover, and our CNC machine shop<\/a> finishes every forged blank in-house.<\/p>\n<\/div>\n<\/section>\n

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MATERIALS & FINISH<\/p>\n

Two alloys, one finish standard<\/h2>\n

Most dropout programs run in 6061-T6<\/a> \u2014 it forges cleanly, welds into the frame without fuss and anodises to an even, scratch-resistant surface. Where stiffness or thread strength decides, we forge 7075-T6<\/a>, machined to the same alignment tolerances.<\/p>\n