NTN 6806 LLU 30x42x7 Fully Contacting Seal BB30

(28 customer reviews)

£20.00 Ex. VAT

NTN 6806 LLU 30x42x7 Fully Contacting Seal Genuine Bearing,

8 in stock

SKU: BRG-NTN-6806-LLU Categories: ,


This is a Genuine NTN deep groove ball bearing

Technical Specifications

  • CN normal clearance
  • Teflon impregnated grease
  • Premium Tier 1 supplier
  • Most sizes are made in Japan, smaller sizes are made in Taiwan

NTN Corporation (Niwa, Tomoe, Nishizono) are one of the oldest bearing manufacturers in the world, with their roots dating back to central Japan in the early 20th century. They have been manufacturing for over 100 years.

Performance details

Bearing Vibration

Measuring vibration is an effective method of ascertaining how well a bearing is manufactured. High-frequency vibration levels, often called spike energy, detect minute microscopic flaws in rolling element bearings. The results below show a typical wheel bearing after 4000km of use. Lower values indicate a superior life and reduced losses from friction losses.

Genuine Bearings, Counterfeits and B Grade

This is a 100% Genuine NTN Bearing. It has been sourced directly from NTN Europe in Annecy, France. It is not B graded, counterfeit or an NTN labelled product from a third party. You can read more about this in the article Counterfeit NTN and SKF Bearings

There have been widespread reports of counterfeit and substandard (B Grade) bearings being sold to unsuspecting customers in the media. Using these items often results in diminished performance, reduced life and sometimes injury to personnel.

Genuine NTN vs Other NTN

The pictures below show two NTN Bearings, the bearing on the left is from Hambini via NTN in France, and the one on the right was purchased from a well-known UK bicycle bearing distributor; they claimed to have sourced their bearings from NTN. From the outside, they both look to be identical, and the packaging that they came in appeared to be identical. Further inspection of the bearings revealed largely similar seals that would be indiscernible to the average consumer. However, upon disassembly, several discrepancies were noted; the most obvious was the 40% higher ball count on the Hambini supplied bearing. Additionally, the Hambini supplied NTN bearing had a riveted metal cage, the distributor's bearing was folded sheet metal. Folded metal cages have considerably poorer load and stiffness ratings. The distributor bearing had failed after only 600km, a root cause investigation was conducted, and the bearings were found to be of dubious quality with an unverifiable supply chain.

Hambini Engineering and Technical Support

Hambini (the individual) is well known for his encyclopedic knowledge of Aerodynamics and tribology (Bearing Engineering) and is a recognized industry expert, he is a Chartered Aerospace Engineer, and his works are often referenced in technical publications and presentations. He has sat on numerous technical committees. On the internet, his training videos on YouTube have been seen over 1 million times. The technical reference documents and publications on the Hambini website alone receive well over 25,000 unique monthly visitors.

The average satisfaction rating from customers is over 97%, one of the highest in the industry. This satisfaction rating has been achieved by providing technically superior products, world-class design and manufacturing engineering, fastidious quality control and unrivalled technical support.

If you have a question, however big or small, you can email support@hambini.com or use the contact form.


Additional information

Inside Diameter (d)

Outside Diameter (D)

Width (b)



Bearing Number

28 reviews for NTN 6806 LLU 30x42x7 Fully Contacting Seal BB30

  1. Stephen Cottle

    The bearings were posted and delivered very quickly when they came in stock. Indeed I could not find any alternative UK suppliers with stock and the price was very competitive. I very much appreciated the advice on the best bearings for bb30. Thanks

  2. Kerr Glen

  3. Martyn L.

    Installed in my Cannondale Topstone Carbon. I now have a super smooth crank and no creaking so very pleased. Only slight criticism would be the postage was a bit expensive but very quick so I can put up with that. Many thanks

  4. Jeremy Leake

    Great bearings and delivered quickly

  5. Richard Harrison

  6. Dave Nagy

    Great bearings and extremely fast service!

  7. David N.

    Great product and fast shipping!

  8. Martin Kells

    Great customer service with Hambini going the extra mile. The bearings are a substantial improvement on the stock bearings which came with the bike.

  9. Klaus

    Fast shipping! Thank you Hambini!

  10. Anonymous

  11. Anonymous

    Arrived problem free to toronto in three weeks

  12. Colin Black

    Arrived next day bearings as described

  13. Barry Scully

    I love that you are selling gear that is properly engineered and not hyped by marketing. Quality bearings and more importantly, genuine not fakes

  14. James

  15. Adrian

    Very prompt delivery. Bearings appear to be very smooth.

  16. Gavin N.

    good reliably sourced bearing. Didn’t help getting me to know my hairdresser

  17. Richard Smith

    Bearings arrived quick and can’t fault the quality. Was worried the full contacting seal might feel a bit draggy, but actually on the road don’t notice a difference. Looking forward to having bearings that won’t rust in 7 months like the old FSA ones!

  18. Anonymous

  19. Matthew

    Have not installed yet.

  20. David J. Mills

    Great Service and products!

  21. Andreas D.

  22. Roy Rietberg

    No experience yet because i still don’t have the tools to pull the current bearings

  23. Anonymous

  24. Andy McDonald

    Time will tell but spins well considering that they sealed

  25. Laurenz Bay

    Thanks for the support

  26. David P.

    Love it! Hambini rocks!

  27. ROB L.

  28. Tony Carmichael

    Hambini personally advised me which bearings I needed and they arrived as ordered. Everything about dealing with Hambini is first class – best advice backed by the best products. He is not the cheapest but he is the best!

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Q & A

I bought a pair of "NTN 6806 LLU 30x42x7 Fully Contacting Seal BB30" I compared them with the old bearings in a cyclocross frame (for competition) and a pair of new unused and unassembled "regular BB30 bike bearings" from a bike shop. When turning the bearings in the hand the "NTN 6806 LLU 30x42x7 Fully Contacting Seal BB30" seem to have a MUCH higher resistance than cheaper regular bearings. -How do you measure bearing resistance in a competition? -Do the NTN bearings need a breaking in period to become smoother turning? -Is the advantage in friction or cycling speed or is the advantage of the NTN bearings or is the advantage pure in other aspects (which)? TP asked on January 19, 2022
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