{"id":4545,"date":"2026-10-25T20:00:31","date_gmt":"2026-10-26T04:00:31","guid":{"rendered":"https:\/\/al-forging.com\/products\/bicycle\/forged-seatpost\/"},"modified":"2026-10-28T20:32:58","modified_gmt":"2026-10-29T04:32:58","slug":"forged-aluminium-seatposts","status":"publish","type":"page","link":"https:\/\/al-forging.com\/es\/forged-aluminium-seatposts\/","title":{"rendered":"Forged Aluminium Seatposts"},"content":{"rendered":"
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BICYCLE COCKPIT \u00b7 FORGED SEATPOSTS<\/p>\n

Forged aluminium seatposts, built as a two-piece assembly.<\/h1>\n

The XPF-SP is forged as two pieces \u2014 head and post \u2014 then CNC-machined at the rail clamp, insertion end and keyway. \u00d828.6 interface as standard, with other diameters and lengths cut to your drawing.<\/p>\n

\n Send a Drawing<\/a>
\n Part Families<\/a>\n <\/div>\n
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\u00d828.6 mm<\/b>standard interface<\/span><\/div>\n
\u00b10.01 mm<\/b>machined per drawing<\/span><\/div>\n
99.7%<\/b>first-pass yield<\/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

A seatpost bends at the head. That is where forging earns its cost.<\/h2>\n
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A seatpost carries the rider’s weight through a lever arm that peaks at the saddle clamp. Machine that head from billet and the grain runs across the bend; forge it and the grain follows the load path. Four reasons the XPF-SP is forged rather than cut:<\/p>\n

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1. Grain follows the bend<\/h3>\n

Closed-die forging turns the head’s grain along the saddle-clamp curve instead of cutting it off at the bend \u2014 the spot where fatigue cracks begin on billet-machined parts.<\/p>\n<\/div>\n

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2. Two pieces, one datum<\/h3>\n

Head and post are machined from a shared reference, so the rail axis, clamp face and insertion end stay square to each other. That alignment is what stops saddles creeping under load.<\/p>\n<\/div>\n

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3. Anodising has nothing to hide<\/h3>\n

Forged 6061 has no casting porosity to bloom through the anodised layer. Sand-black and sand-silver finishes stay even across the head, tube and clamp faces.<\/p>\n<\/div>\n

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4. Material only where it works<\/h3>\n

Near-net forging leaves a controlled wall through the post and a thicker section at the head, instead of a uniform billet wall that is heavy in the wrong places.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

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\"Forged<\/figure>\n

Setback head, two-bolt rail clamp and laser-marked insertion scale \u2014 forged, machined and anodised in-house.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<\/section>\n

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PART FAMILIES<\/p>\n

What we forge for cockpit and seat programs<\/h2>\n
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XPF-SP complete seatpost<\/h3>\n
Two-piece forged head and post<\/span>\u00d828.6 interface as standard<\/span>Sand-silver \/ sand-black \/ colour anodised<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Setback seatpost heads<\/h3>\n
Setback offsets to your drawing<\/span>One- or two-bolt micro-adjust rail clamp<\/span>Forged head, CNC-finished faces<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Seatpost sub-assemblies<\/h3>\n
Forged heads and clamp bodies for your own program<\/span>Machined to your tube and rail geometry<\/span>Anodised or as-forged supply<\/span><\/div>\n<\/p><\/div>\n<\/div>\n
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Dropper & seat-clamp hardware<\/h3>\n
Collars, actuator levers, saddle-clamp heads and cable guides<\/span>Forged or forged-and-machined parts<\/span>Small-batch and multi-SKU friendly<\/span><\/div>\n<\/p><\/div>\n<\/div><\/div>\n<\/div>\n<\/section>\n
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ENGINEERING<\/p>\n

Built to the interface tolerances a cockpit needs<\/h2>\n
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Requirement<\/th>\nHow XPF meets it<\/th>\n<\/tr>\n<\/thead>\n
Interface<\/th>\n\u00d828.6 standard; other insertion diameters, wall profiles and shims to drawing<\/td>\n<\/tr>\n
Length & profile<\/th>\nCut and machined to the length on your drawing \u2014 straight or setback<\/td>\n<\/tr>\n
Head & clamp<\/th>\nOne- or two-bolt micro-adjust rail clamps; forged or machined clamp bodies to your saddle-rail geometry<\/td>\n<\/tr>\n
Material<\/th>\n6061-T6 standard; 6063, 6082 and 7075 on request \u2014 mill certificate per alloy batch<\/td>\n<\/tr>\n
Machining<\/th>\n\u00b10.01 mm features per drawing review: insertion end, keyway, clamp slots and thread interfaces<\/td>\n<\/tr>\n
Finish<\/th>\nType II \/ III anodising, sandblast matte, colour matching and laser marking<\/td>\n<\/tr>\n
Validation<\/th>\nCMM dimensional report, hardness and spectrometer checks; PPAP \/ FAI documentation on request<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Every program is quoted from your drawing and approved specification \u2014 not from a catalogue page. If a dimension or load case is not on the drawing, we ask before quoting. The same discipline runs through our CNC machining<\/a> and CNC-to-forging<\/a> programs.<\/p>\n<\/div>\n<\/section>\n

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MATERIALS & FINISH<\/p>\n

6061-T6 as standard, 7075 when the brief demands it<\/h2>\n

Most seatpost programs run in 6061-T6<\/a>: it forges cleanly, takes a deep anodised finish and keeps cost sane. Where a program needs higher stiffness or thread strength at the clamp, we forge 7075-T6<\/a> and machine it to the same tolerances.<\/p>\n