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Discussion History

Bottom Bracket

Assembly

Sealed threaded bottom bracket in the 68mm BSA shell. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Bottom Bracket parts and their functions

3 top-level parts · 6 parts in total · full bill of materials below
Bottom Bracket parts diagram: 1 ball bearing, 2 bottom bracket cup, 3 oil seal. 6 parts in 3 top-level items.
Bottom Bracket parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Ball Bearing 2× Sealed cartridge bearings
2 Bottom Bracket Cup 2×
3 Oil Seal 2× Spring-loaded rotary lip seal that keeps lubricant inside a housing and dirt out where a shaft passes through, sized to DIN 3760.

3D model

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Build & assembly graph

expand / collapse · shared sub-assemblies converge · links to related products · est. labour
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Bill of materials for Bottom Bracket

3 top-level lines · 3 rows shown · 6 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Ball Bearing ball-bearing 2× 2 · part
2 Bottom Bracket Cup cargo-bicycle-bb-cup 2× 2 · part
3 Oil Seal oil-seal 2× 2 · part

Where the bottom bracket is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Drivetrain

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$200. How estimates work
VendorHQSpecialtyMOQLead time
🇮🇳Bharat Forge
bharatforge.com ↗ 		Pune, IN Forgings & metal parts 500 pcs 6–10 wks
🇨🇳CITIC Dicastal
dicastal.com ↗ 		Qinhuangdao, CN Aluminium castings & wheels 500 pcs 6–10 wks
🇮🇳Tata AutoComp
tataautocomp.com ↗ 		Pune, IN Auto components 500 pcs 6–10 wks
🇸🇬Beyonics
beyonics.com ↗ 		Singapore Precision metal & mfg 500 pcs 6–10 wks
🇮🇳Sundaram Clayton
sundaram-clayton.com ↗ 		Chennai, IN Die castings 500 pcs 6–10 wks