{"product_id":"titanium-balance-seatpost-set-for-brompton-folding-bikes-d31-8-d33-9-d34-9-l560-600mm","title":"Titanium Balance Seatpost Set for Brompton \u0026 Birdy Folding Bikes – D31.8 \/ D33.9 \/ D34.9 × L560\/600mm","description":"\u003ch1\u003eProduct Description\u003c\/h1\u003e\n\u003cp\u003eA lightweight \u003cstrong\u003eGrade 9 titanium balance seatpost set\u003c\/strong\u003e designed for Brompton folding bikes. Available in 31.8mm, 33.9mm and 34.9mm diameters with 560mm and 600mm length options, complete with the matching balance-seatpost hardware and base cradle system.\u003c\/p\u003e\n\u003ch2\u003eSpecifications at a Glance\u003c\/h2\u003e\n\u003ctable style=\"width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 14.1324%;\"\u003eVariant\u003c\/th\u003e\n\u003cth align=\"right\" style=\"width: 12.8801%;\"\u003eDiameter\u003c\/th\u003e\n\u003cth align=\"right\" style=\"width: 10.8971%;\"\u003eLength\u003c\/th\u003e\n\u003cth align=\"right\" style=\"width: 14.3265%;\"\u003eSeatpost Weight\u003c\/th\u003e\n\u003cth align=\"right\" style=\"width: 23.7925%;\"\u003eListed Kit Hardware Weight\u003c\/th\u003e\n\u003cth align=\"right\" style=\"width: 22.1825%;\"\u003eListed Total System Weight\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 14.1324%;\"\u003e\u003cstrong\u003eD31.8 × 600mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 12.8801%;\"\u003e31.8mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 10.8971%;\"\u003e600mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 14.3265%;\"\u003e275g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 23.7925%;\"\u003e46g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 22.1825%;\"\u003e\u003cstrong\u003e321g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 14.1324%;\"\u003e\u003cstrong\u003eD33.9 × 560mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 12.8801%;\"\u003e33.9mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 10.8971%;\"\u003e560mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 14.3265%;\"\u003e256g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 23.7925%;\"\u003e46g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 22.1825%;\"\u003e\u003cstrong\u003e302g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 14.1324%;\"\u003e\u003cstrong\u003eD33.9 × 600mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 12.8801%;\"\u003e33.9mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 10.8971%;\"\u003e600mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 14.3265%;\"\u003e275g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 23.7925%;\"\u003e46g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 22.1825%;\"\u003e\u003cstrong\u003e321g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 14.1324%;\"\u003e\u003cstrong\u003eD34.9 × 560mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 12.8801%;\"\u003e34.9mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 10.8971%;\"\u003e560mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 14.3265%;\"\u003e289g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 23.7925%;\"\u003e46g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 22.1825%;\"\u003e\u003cstrong\u003e335g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 14.1324%;\"\u003e\u003cstrong\u003eD34.9 × 600mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 12.8801%;\"\u003e34.9mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 10.8971%;\"\u003e600mm\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 14.3265%;\"\u003e302g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 23.7925%;\"\u003e46g\u003c\/td\u003e\n\u003ctd align=\"right\" style=\"width: 22.1825%;\"\u003e\u003cstrong\u003e348g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eSeatpost material:\u003c\/strong\u003e Grade 9 Titanium Alloy (Ti-3Al-2.5V)\u003cbr\u003e\u003cstrong\u003eMinimum wall thickness:\u003c\/strong\u003e 1.0mm\u003cbr\u003e\u003cstrong\u003eSpecified load limit:\u003c\/strong\u003e 80kg\u003cbr\u003e\u003cstrong\u003eBolt tool:\u003c\/strong\u003e 4mm Allen key\u003cbr\u003e\u003cstrong\u003eBase cradle:\u003c\/strong\u003e 1 × Titanium + 1 × free Carbon-Fiber\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Brompton folding bikes\u003cbr\u003e\u003cstrong\u003eLength options:\u003c\/strong\u003e 560mm \/ 600mm\u003cbr\u003e\u003cstrong\u003eDiameter options:\u003c\/strong\u003e 31.8mm \/ 33.9mm \/ 34.9mm\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003eWeight note:\u003c\/strong\u003e The 46g hardware figure is the listed accessory weight supplied with the corresponding seatpost variant. The individual component weights provided separately do not mathematically reconcile exactly with this 46g figure, so the 46g figure should be treated as the supplier-listed kit hardware weight rather than a calculated sum.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch2\u003eFinish Options by Variant\u003c\/h2\u003e\n\u003cp\u003eFinish availability varies by seatpost specification.\u003c\/p\u003e\n\u003ch3\u003eD31.8 × 600mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGold · Rainbow · Titanium · Black · Blue · Mirror Gold · Mirror Rainbow · Mirror Black · Mirror Blue\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eD33.9 × 560mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGold · Rainbow · Titanium · Black · Blue · Mirror Gold · Mirror Rainbow · Mirror Black · Mirror Blue · Matte Titanium · Matte Black\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eD33.9 × 600mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGold · Rainbow · Titanium · Black · Blue · Mirror Gold · Mirror Rainbow · Mirror Black · Mirror Blue · Matte Titanium · Matte Black\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eD34.9 × 560mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGold · Rainbow · Titanium · Black · Blue · Mirror Gold · Mirror Rainbow · Mirror Black · Mirror Blue · Matte Titanium · Matte Black\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eD34.9 × 600mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGold · Rainbow · Titanium · Black · Blue · Mirror Gold · Mirror Rainbow · Mirror Black · Mirror Blue · Matte Titanium · Matte Black\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMatte Titanium and Matte Black are not available for the D31.8 × 600mm variant.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eComplete Balance Seatpost Set\u003c\/h2\u003e\n\u003cp\u003eThe complete set includes the titanium balance seatpost together with its matching mounting hardware and base cradle components.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded Component\u003c\/th\u003e\n\u003cth align=\"right\"\u003eQuantity\u003c\/th\u003e\n\u003cth align=\"right\"\u003eWeight\u003c\/th\u003e\n\u003cth\u003eTool \/ Compatibility\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM5 × 41mm Variable-Diameter Seatpost Bolt\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e3.53g\u003c\/td\u003e\n\u003ctd\u003e4mm Allen key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM5 × 47mm Variable-Diameter Seatpost Bolt\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e3.87g\u003c\/td\u003e\n\u003ctd\u003e4mm Allen key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM5 × 49mm Seatpost Cradle Clamp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e2\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e6.8g\/pc\u003c\/td\u003e\n\u003ctd\u003eFits M5 × 0.8mm bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM10 × 65mm Balance Seatpost Center Pin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e6.8g*\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3DAM-Specific Seatpost Base Cradle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e13.3g\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCarbon-Fiber Seatpost Base Cradle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1\u003c\/td\u003e\n\u003ctd align=\"right\"\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFree bonus\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e* Weight supplied in the original product specification.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eseatpost base cradle has been upgraded to titanium\u003c\/strong\u003e. A \u003cstrong\u003ecarbon-fiber base cradle is included free of charge\u003c\/strong\u003e as an additional piece.\u003c\/p\u003e\n\u003cp\u003eThe bolts and individual components included in this set are also available separately in their corresponding product variants, allowing replacement or individual upgrades without purchasing the complete seatpost set again.\u003c\/p\u003e\n\u003ch2\u003eCustom Reduced-Shank Titanium Bolts\u003c\/h2\u003e\n\u003cp\u003eThe kit includes two custom \u003cstrong\u003eM5 variable-diameter \/ reduced-shank bolts\u003c\/strong\u003e, available in 41mm and 47mm lengths.\u003c\/p\u003e\n\u003cp\u003eTheir reduced-shank construction removes unnecessary material from the bolt body while retaining the required threaded and load-bearing sections.\u003c\/p\u003e\n\u003ch3\u003eM5 × 41mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.53g\/pc\u003cbr\u003e\u003cstrong\u003eTool:\u003c\/strong\u003e 4mm Allen key\u003c\/p\u003e\n\u003ch3\u003eM5 × 47mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.87g\/pc\u003cbr\u003e\u003cstrong\u003eTool:\u003c\/strong\u003e 4mm Allen key\u003c\/p\u003e\n\u003cp\u003eThese two bolts are also available separately as individual variants.\u003c\/p\u003e\n\u003ch2\u003eSaddle Clamp Plates\u003c\/h2\u003e\n\u003cp\u003eThe kit includes \u003cstrong\u003etwo M5 × 49mm Saddle Clamp Plates\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.8g each\u003cbr\u003e\u003cstrong\u003eCompatible bolt thread:\u003c\/strong\u003e M5 × 0.8mm\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e49mm dimension refers to the clamp-plate specification, not an M5 × 49mm bolt\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThese are clamp plates used within the saddle\/balance-seatpost assembly and are not threaded bolts themselves.\u003c\/p\u003e\n\u003cp\u003eThey are also available separately.\u003c\/p\u003e\n\u003ch2\u003eBalance Seatpost Center Pin\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification:\u003c\/strong\u003e M10 × 65mm\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.8g\/pc\u003c\/p\u003e\n\u003cp\u003eThe center pin is the central hardware component of the balance-seatpost assembly and is supplied as part of the complete kit.\u003c\/p\u003e\n\u003cp\u003eIt is also available separately for replacement purposes.\u003c\/p\u003e\n\u003ch2\u003eTitanium Base Cradle + Free Carbon-Fiber Base Cradle\u003c\/h2\u003e\n\u003cp\u003eThe standard kit now uses an \u003cstrong\u003eupgraded titanium base cradle\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTitanium Base Cradle\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWeight: 13.3g\/pc\u003c\/li\u003e\n\u003cli\u003eIncluded as standard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCarbon-Fiber Base Cradle\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1 piece included free with the complete kit\u003c\/li\u003e\n\u003cli\u003eWeight: not specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis gives the complete set two base-cradle material options without requiring a separate purchase for the carbon-fiber component.\u003c\/p\u003e\n\u003ch1\u003eGrade 9 Titanium Construction\u003c\/h1\u003e\n\u003cp\u003eThe seatpost tube is manufactured from \u003cstrong\u003eGrade 9 Titanium Alloy (Ti-3Al-2.5V)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eGrade 9 titanium combines high strength, toughness, corrosion resistance, and low density, making it well suited to lightweight bicycle components where structural performance and weight both matter.\u003c\/p\u003e\n\u003cp\u003eThe seatpost features a \u003cstrong\u003eminimum wall thickness of 1.0mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eS-PARTS selects Grade 9 titanium for the seatpost tube specifically for its balance of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh strength-to-weight ratio\u003c\/li\u003e\n\u003cli\u003eToughness and flexibility\u003c\/li\u003e\n\u003cli\u003eCorrosion resistance\u003c\/li\u003e\n\u003cli\u003eLow density\u003c\/li\u003e\n\u003cli\u003eLong-term durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe specified \u003cstrong\u003eload limit is 80kg\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The 80kg figure is presented as the product's specified load limit. Please do not interpret it as a separately verified definition of rider weight, total bicycle load, or luggage capacity. Confirm the applicable loading condition with the manufacturer before use if this distinction is important to your application.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch2\u003eGrade 5 Titanium Fastener Material\u003c\/h2\u003e\n\u003cp\u003eS-PARTS uses different titanium alloys for different product categories.\u003c\/p\u003e\n\u003cp\u003eThe seatpost tube is specified as:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrade 9 Titanium — Ti-3Al-2.5V\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eS-PARTS also manufactures titanium fasteners from:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGrade 5 Titanium — Ti-6Al-4V\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eGrade 5 titanium is widely used for high-performance titanium fasteners because of its high strength and excellent strength-to-weight ratio.\u003c\/p\u003e\n\u003cp\u003eThe broader S-PARTS titanium fastener material program specifies Grade 5 titanium with an average tensile strength exceeding \u003cstrong\u003e1050 MPa\u003c\/strong\u003e, compared with the commonly referenced minimum tensile-strength level of approximately \u003cstrong\u003e895 MPa\u003c\/strong\u003e for Grade 5 titanium.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe individual fastener material specification should be confirmed against the corresponding product variant where required.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003ePrecision Hot Forging \u0026amp; CNC Machining\u003c\/h2\u003e\n\u003cp\u003eS-PARTS focuses on controlled manufacturing processes rather than treating titanium hardware as a simple material substitution.\u003c\/p\u003e\n\u003cp\u003eTitanium bolt heads are formed using \u003cstrong\u003eS-PARTS custom forging dies\u003c\/strong\u003e under approximately \u003cstrong\u003e650°C high-temperature processing conditions\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eTo maintain forging precision and consistency, each dedicated forging die is used for \u003cstrong\u003eno more than 300 forming cycles\u003c\/strong\u003e before replacement.\u003c\/p\u003e\n\u003cp\u003eThe fastener bodies are then machined using precision CNC equipment.\u003c\/p\u003e\n\u003cp\u003eCritical dimensions and threaded features are controlled through a \u003cstrong\u003emicron-level tolerance management process\u003c\/strong\u003e, helping maintain consistent geometry, thread engagement, and component fit.\u003c\/p\u003e\n\u003cp\u003eFor precision titanium hardware, these manufacturing controls are intended to ensure that the finished component performs as precisely as it looks.\u003c\/p\u003e\n\u003ch2\u003eTitanium Surface Treatments\u003c\/h2\u003e\n\u003cp\u003eS-PARTS offers several titanium surface finishes using different treatment technologies rather than conventional paint.\u003c\/p\u003e\n\u003ch3\u003ePVD Vacuum Nitride Coating\u003c\/h3\u003e\n\u003cp\u003eSelected finishes, including \u003cstrong\u003eGold, Black and Blue\u003c\/strong\u003e, use a \u003cstrong\u003ePVD vacuum nitride coating process\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe process forms a dense nitride-based surface layer that improves surface hardness and resistance to impact and wear while producing a durable metallic finish.\u003c\/p\u003e\n\u003cp\u003eThe resulting color is integrated into the treated surface rather than being created by conventional paint or dye.\u003c\/p\u003e\n\u003ch3\u003eElectrolytic Anodizing\u003c\/h3\u003e\n\u003cp\u003eSelected titanium colors are produced using \u003cstrong\u003eelectrolytic anodizing\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eDuring the anodizing process, the thickness of the titanium oxide layer is controlled to alter the way incident and reflected light interact.\u003c\/p\u003e\n\u003cp\u003eThe resulting \u003cstrong\u003eoptical interference effect\u003c\/strong\u003e creates the characteristic range of titanium colors without the use of conventional coloring dyes.\u003c\/p\u003e\n\u003cp\u003eThis is also why anodized titanium can display subtle changes in appearance under different lighting and viewing angles.\u003c\/p\u003e\n\u003ch2\u003eMatte Black \u0026amp; Matte Titanium\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMatte Black\u003c\/strong\u003e and \u003cstrong\u003eMatte Titanium\u003c\/strong\u003e finishes use a combined:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBlasting + Vacuum Nitride Coating\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eprocess.\u003c\/p\u003e\n\u003cp\u003eBlasting creates the fine matte texture and distinctive tactile surface, while the subsequent vacuum coating provides the final surface finish.\u003c\/p\u003e\n\u003cp\u003eThe result is a more subdued, technical appearance compared with polished or mirror-finished titanium.\u003c\/p\u003e\n\u003ch2\u003eS-PARTS Titanium Manufacturing\u003c\/h2\u003e\n\u003cp\u003eS-PARTS works with a metal-material supply chain serving the aerospace industry in Xi'an and conducts ongoing material comparison and laboratory testing to select titanium materials that meet its internal standards.\u003c\/p\u003e\n\u003cp\u003eFrom raw material selection to forging, CNC machining, dimensional control, and surface treatment, the manufacturing process is built around consistency rather than simply producing a visually attractive titanium component.\u003c\/p\u003e\n\u003cp\u003eThe combination of \u003cstrong\u003eGrade 9 titanium construction, precision machining, controlled forging, specialized surface treatment, and lightweight hardware\u003c\/strong\u003e defines the S-PARTS approach to high-end titanium bicycle components.\u003c\/p\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1 × Grade 9 Titanium Balance Seatpost\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 × M5 × 41mm Variable-Diameter Titanium Bolt\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 × M5 × 47mm Variable-Diameter Titanium Bolt\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2 × M5 × 49mm Saddle Clamp Plates\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 × M10 × 65mm Balance Seatpost Center Pin\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 × 3DAM-Specific Titanium Seatpost Base Cradle\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e1 × Carbon-Fiber Seatpost Base Cradle — Free Bonus\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eCompatibility \u0026amp; Ordering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003eBrompton folding-bike applications\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAvailable diameters: \u003cstrong\u003e31.8mm \/ 33.9mm \/ 34.9mm\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAvailable lengths: \u003cstrong\u003e560mm \/ 600mm\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAvailable configurations are limited 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