The Positz English Thread Bicycle Bottom Bracket Shell is a high-quality component designed for custom-made bicycle frames, restorations, indoor ergo bike projects, and other similar applications. It provides a sturdy and reliable foundation for the bottom bracket assembly of a bicycle.
Key Features:
- English Thread: This bottom bracket shell features an English thread, which is a commonly used threading standard for bicycle bottom brackets.
- Dimensions: The bottom bracket shell has a diameter of 1.38 inches (35mm) and a length of 68mm. The outside diameter of the shell measures 40mm.
- Material: Made from raw machined steel, the bottom bracket shell offers durability and strength for long-lasting performance.
- Thread Type: The shell is equipped with both left-hand English thread and right-hand English thread, allowing for easy installation and compatibility with various components.
- Weight: The approximate weight of the bottom bracket shell is 175g, ensuring it adds minimal extra weight to the completed bike.
- Origin: The Positz bottom bracket shell is manufactured in Taiwan, known for producing high-quality bicycle components.
Whether you’re building a custom bike frame or restoring an old bicycle, the Positz English Thread Bicycle Bottom Bracket Shell provides a reliable and compatible solution for your bottom bracket needs. Its durable construction and precise threading make it a suitable choice for various cycling projects.













![Positz S52 Chain in Box [PSTZ-3031]](https://www.mrcyclingworld.com.au/wp-content/uploads/Positz-S52-Chain-in-Box-PSTZ-3031-copy-610x610.jpg)



![Hammerhead Karoo 2 GPS Bike Computer [Used]](https://www.mrcyclingworld.com.au/wp-content/uploads/2026/02/Hammerhead-Karoo-2-primary-610x610.jpg)















![AirPro Kids Bike Tubes 16 x 1.75-2.125, Schrader Car Valve (2 Pack) [TU505]](https://www.mrcyclingworld.com.au/wp-content/uploads/AirPro-Kids-Bike-Tubes-16-x-1.75-2.125-Schrader-Car-Valve-2-Pack-TU505-610x610.jpg)






















Extremely fast shipping!! Item bought one day and received down in Tassie the next!! The threaded shell is absolutely brilliant!! I’m building a mountain bike out of timber from scratch, and this is the perfect component for the BB to fit in to, it was just what I was after! Very, very happy with purchase!!!
Great quality
Really good quality, very happy and such rapid response
Thank you
As described fast delivery
Fantastic value, good quality. I couldn’t have made it any cheaper with my lathe. Very convenient
5 star service quality item efficient helpful seller
Correct item