Ukraina, Aist Bicycle Cottered Bottom Bracket (Threaded Cups)

Bicycle Bottom Bracket Assembly (Cottered, Threaded Cups, Spindle Length 140–144 mm)

Complete bottom bracket repair kit (cottered spindle + threaded cups + bearings + locknut) is designed for major repairs of the pedal drive on classic road, city, cargo, and folding bicycles with a threaded bottom bracket shell. The 140–144 mm spindle (16 mm crank seat diameter) features integrated thrust cones (shoulders) for ball retainer bearings and milled flats for fixing the cranks with standard bicycle cotter pins. All structural components are made of hardened carbon steel with a protective galvanic coating, ensuring smooth pedal rotation, zero play, and resistance to impact loads during off-road riding.

Key Advantages and Features:

• Complete Assembly Kit: Includes the bottom bracket spindle, right and left threaded cups, two ball bearings in steel retainers, and a slotted locknut — all parts are matched and ready for installation.
• Hardened Spindle and Cup Raceways: Heat treatment of the spindle cones and internal cup raceways prevents pitting, wear, and crunching when pedaling while standing.
• Standard Cottered Crank Fit (140–144 mm): Precise milled flats at the spindle ends ensure a tight crank fit without slipping or misalignment of the chainring.
• Easy Adjustment and Serviceability: The left cup with slots and a locknut allows for precise setting of the bearing clearance and easy maintenance using a standard multi-tool or spanner wrench.
• Anti-Corrosion Galvanic Coating: Zinc / chrome plating protects the threads and outer surfaces from seizing in the frame's bottom bracket shell when exposed to moisture and dirt.

Compatibility and Application:

The kit is used in bicycles of Soviet, Ukrainian, Belarusian, and modern production with a threaded bottom bracket shell (BSA 1.37"×24 TPI / M35×1 standard) and cottered cranks:

• Road Bicycles (28" wheels): Ukraina (KhVZ V-120, V-130, V-134, 111-411, 111-421, 111-441), Aist (MMVZ), Minsk, Ural, Sura, Progress, Desna.
• Folding and Youth Bicycles (20"–24" wheels): Kama, Aist (folding), Desna-2, Salyut, Tair, Orlenok, Shkolnik (modifications with a standard threaded bottom bracket).
• Cargo and Modern Road Models: Fermer, Ardis, Formula, Dorozhnik, Titan, Azimut (versions with a classic cottered bottom bracket).

Technical Specifications:

Package Contents:

1. Cottered bottom bracket spindle (140–144 mm) — 1 pc.
2. Right threaded cup (fixed cup with flange) — 1 pc.
3. Left threaded cup (adjustable cup with slots) — 1 pc.
4. Ball retainer bearing — 2 pcs.
5. Left cup slotted locknut — 1 pc.

Pro tip: Before assembly, thoroughly clean the th