Bicycle bottom bracket with optimized sealing system

Precision Bottom Brackets for Demanding Bikes

Durable. Low-Maintenance. Pressure-Wash Resistant.

At Artur Küpper GmbH & Co. KG, we develop high-performance bottom brackets tailored to the needs of OEM bicycle manufacturers. Designed for extreme loads, long-term reliability and easy cleaning – ideal for e-bikes, touring and performance bicycles.

The Challenge: Pressure Washing, Dirt, Corrosion – Maximum Demands on the Bottom Bracket

In daily use, bicycles must withstand a wide variety of conditions. Mud, dust, sand and pressure washers put conventional bottom brackets under stress. Standard seals often fail – allowing water and dirt to penetrate, causing premature wear.

OEM manufacturers therefore require bottom bracket solutions that perform reliably in real-world conditions – retaining full sealing performance even after years of use and repeated high-pressure cleaning.

The Solution: Küpper Special Bottom Brackets with Innovative Sealing System

Our bottom brackets have been specially developed to meet the requirements of modern bicycle manufacturers. They combine industrial-grade technology with application-oriented design – ideal for e-bikes, touring bikes, trekking bikes and sporty urban bikes.

Technical Advantages:

• Form-fit sealing system with steel carrier
  The integrated sealing lip is securely fixed in the housing – no washout under pressure. Superior to standard NBR seals.
• Labyrinth seal against dirt and water
  Multi-stage barrier effectively prevents contamination ingress.
• Corrosion-resistant materials
  All components are designed for maximum durability and environmental resistance.
• Compact design for limited installation space
  Perfect integration into bottom bracket shells – even in tight spaces.
• Low-friction operation despite sealing
  Minimal friction ensures a smooth and efficient riding experience.

Optional: High-End Hybrid Bearings with Ceramic Balls and Stainless Steel Races

For particularly high-performance bicycle models, we also offer our bottom bracket solution as a hybrid bearing:

• Ceramic balls (Silicon Nitride, Grade 10):
  Especially lightweight, smooth and wear-resistant – for minimal friction and long service life.
• Stainless steel races:
  Corrosion-resistant and durable even under aggressive cleaning agents and environmental influences.
• Noticeable performance advantages:
  Less friction, higher efficiency, longer durability – ideal for e-bikes, cargo bikes and high-performance bikes.

Your Benefits as a Manufacturer:

• ✔Pressure-wash resistant bottom brackets – sealed against water and dirt up to 130 bar
• ✔Low-maintenance & durable – fewer service requirements
• ✔Corrosion protection through stainless steel and sealing technology
• ✔Made in Germany – developed and produced in Velbert
• ✔Reliable series production for OEM customers

Over 10 Years of Experience in Bottom Brackets – Over 90 Years of Expertise in Bearings

For over 90 years, Artur Küpper has stood for quality and precision in bearing technology – made in Germany. Our more than 10 years of experience in bicycle bottom brackets directly informs the development of robust, low-maintenance and high-performance solutions for the bicycle industry.

Thanks to our industrial background, we combine the highest manufacturing standards with the specific requirements of modern bicycle manufacturers – for long-lasting bottom bracket units that remain reliable even under extreme conditions.

👉 Contact us for samples or technical consultation.