NTN 6903 LLB 17x30x7 Ultra Low Friction Seal

(63 customer reviews)

£19.00 Ex. VAT

NTN 6903 LLB 17x30x7 Ultra Low Friction Seal Genuine Bearing,

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SKU: BRG-NTN-6903-LLB 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

63 reviews for NTN 6903 LLB 17x30x7 Ultra Low Friction Seal

  1. Luke Philpott

    Genuine bearings really quick delivery, I will be using you again.

  2. Michael Harrison

    Awesome bearings! Installed them on my Zipp 303s and they are silky smooth. I love your you tube videos. Keep doing them!!

  3. Alfonso M.

  4. Albert H.

  5. Lee Williams

    excellent bearings, fast delivery, good price.

  6. Tony Carmichael

    Hambini was extremely helpful in making sure I got the right product for my bike.

  7. James Evans

  8. William Kin

    Outstanding support and wonderful products!

  9. Andrzej Pijanowski

    I didn’t replace the bearing yet but great service and fast shipping.

  10. Anonymous

    Faster rolling than Ceramic speed

  11. Diego Marocchio

  12. Steven Bailey

    only just fitted to my lovely zipp wheels, they seem to spin very well and are nice and smooth

  13. Anonymous

  14. Callum

    Fast efficient, excellent communication and a consistent source of quality products manufactured to exceptional tolerances. I really enjoy your videos and Appreciate excellence in a similar fashion. I was also taught to have a similar view of life until proven otherwise and both your services and opinion is both refreshing and much needed in a Society of mediocre And sub standard acceptance.

  15. Kevin Kawainui

    Perfect fit for Zipp 303s. Thank you

  16. Nick A.

    Bearings came really quickly – spot on service.

  17. Kevin Kawainui

    Bearings were as promised and installed perfectly.

  18. Anthony

    Excellent communication, product, and shipping. Buy with confidence.

  19. Dean k.

    Good product, but I think they where a too expensive and over priced shipping cost.

  20. Nathan Ansell

    Great communication throughout, and advised on various bearings to fit my zipp wheels. Ordered and arrived a couple of days later. Perfect service

  21. E J W

  22. Wilmar Gerstgrasser

    Good product as always and fast delivery. Thanks!

  23. Anonymous

  24. Andrew Dodds

    Blimey no swearing involved. Sold by a 5yr old. Fitted by a 3 yr old. Retro dude.

  25. Kanstantsin

    Hello Hambini fans.
    I received bearings in oem package and already installed them. Highly recommend.

  26. David Tam

    I came across Hambini’s YouTube channel and purchased these for my zipp 404 wheels.

    The bearings came in super quick to Canada.

    I haven’t had a chance to install them yet, but I’m sure they’ll be fantastic!

    Thanks, Hambini, for all the info and the excellent service/parts!

  27. Dafydd Davies

    Smooth + Good customer service

  28. David W.

  29. Ian Cuddy

  30. Lee

    Don’t listen to the professional haters or B$ of the over priced vapourware marketing gainz.

    Hambini provided me with a super fast response over email on how to get hubs reamed and improve bearing fit prior to making a purchase.

    The advise and new bearings have brought about not only a silky smooth ride, but also competitive times in TTs.

    And prices are superb! will be purchasing more Hambini supplied bearings in future.

  31. Rick P.

  32. Suzanne N.

    Very fast shipping and great product. Thanks!

  33. Antony A.

    Quality service, responded to questions super quick providing exactly what I needed. Delivery was quick and the bearings are amazing. Highly recommended ?

  34. Pierre Z.

    Don’t bother to look for ceramic bearings. These bearings are way better. Fast shipping and very good experiance over all.

  35. Robert

  36. Vasilis Koukourakis

  37. Andrew H.

    Excellent service. All questions answered promptly & professionally. Quick delivery & can’t recommend highly enough. Rated 11 out of 10

  38. William Anderson

    Excellent service even advised what bearings I required.

  39. Martin

    Expensive but good

  40. Darren C.

    Replaced my bearing in my winspace wheel with this NTN .so far so good 👍

  41. Harry Brawley

  42. Raul O.

  43. Vincent Giampa

    I purchased 6903 and 6803 for Zipp 202/188 v9 wheel hubs and free hub. All bearings installed easily and are silky smooth. I would highly recommend these bearings

  44. Wayne Harrison

    High quality bearings that are far superior to ceramics, roll faster, cheaper and do the job

  45. Raymond Kelly

    as above.

  46. Darragh H.

  47. Scott McClymont

  48. Peter Kelly

    Bearings were perfect. Right size and spec. Thanks Hambini

  49. Shane Courtney

    Perfect, thanks.

  50. Anonymous

    Good service! Will buy again!

  51. Denys B.

  52. Holger Koser

    Much better than ceramic crap!

  53. kim butler

    Hambini answers questions personally often. I know bearings are quality and the real thing. They spin smoothly in wheels now

  54. Steven Fawcett

  55. David

    Excellent Service & Products

  56. Stuart Lafferty

    Bearings of a pleasing buttery smoothness, delivered at great speed.

  57. Neil T.

    Quality product delivered quickly, highly recommended

  58. PAUL T.

  59. Vincenzo Iaciofano

    Great customer service from hambini with these quality products

  60. Scott

  61. Scott B.

    Top notch products and service. Super smooth bearings to replace the disappointingly short lived ones for my Zipp 404 rear wheel. (2 x 6803 & 2 x 6903). Ordered late evening and got them next day. Most excellent 😄

  62. Stephen W.

  63. Michael Conner

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