NTN 6903 LLU 17x30x7 Fully Contacting Seal

(18 customer reviews)

£18.50 Ex. VAT

NTN 6903 LLU 17x30x7 Fully Contacting Seal Genuine Bearing,

12 in stock

SKU: BRG-NTN-6903-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

18 reviews for NTN 6903 LLU 17x30x7 Fully Contacting Seal

  1. Paul Palmer

    I wanted quality and it was delivered. thanks.

  2. Michael W.

  3. Scott

    Great service, super quick delivery and great advice.

  4. matthew beadle

    Great product works a treat

  5. Simon

    Substantial bearings but appear more draggy than the HUX? originals

  6. Sean T.

    Problem with delivery but Hambini sorted it out in double quick time. Great service.

  7. Thomas Estabrooks

    Product was as advertised fast and shipping. Very happy.

  8. David W.

  9. Steven W.

    I trust Hambini to send me quality, authentic bearings.

  10. Marian R.

    Very happy with my purchase. Great product and super fast delivery.

  11. Walter Lees

  12. John H.

    Perfect replacements!!

  13. Daniel Wagner

    Great product, super smooth and clearly original!

  14. nick Kovach

  15. Renan G.

    Rear wheel bearings for CRD 351 on a BMC, I hope they will last longer than the original ones

  16. Philippe

  17. Shane O.

    Great service and fast delivery, not bad for a 5 year old 😀

  18. Anonymous

Add a review

Your email address will not be published. Required fields are marked *

Q & A

Which Bearing do you recommend for a zipp 303s front wheel (76D hubs). after a bit of research I think this is the one I need NTN 6903 llu Roberto asked on January 5, 2023
(0) (0)

Ask a question

Your question will be answered by a store representative or other customers.

Thank you for the question!

Your question has been received and will be answered soon. Please do not submit the same question again.



An error occurred when saving your question. Please report it to the website administrator. Additional information:

Add an answer

Thank you for the answer!

Your answer has been received and will be published soon. Please do not submit the same answer again.



An error occurred when saving your answer. Please report it to the website administrator. Additional information: