MH-P08H8F Headset Bearing 30.5×41.8×8 45/45 1C2 K845H8F TH870E(FSA) MR121 ACB845F ACB418F MH-P08F
£8.95 Ex. VAT
MH-P08H8F Headset Bearing 30.5×41.8×8 45/45 1C2 K845H8F TH870E(FSA) MR121 ACB845F ACB418F MH-P08F This is a chrome steel Angular Contact Headset Bearing designed for use in Bicycle steering systems. Photographs are for illustration purposes
Out of stock
Description
This is a premium HPE (Hambini Performance Engineering) headset bearing designed for Front Fork steerer systems on bicycles. This is a chrome steel bearing with hardened inner and outer raceways. The internal cage that supports and spaces the balls is reinforced to improve axial stiffness. The geometrical and dimensional tolerances and running clearances would be broadly in line with JIS B1514 Tolerance Class 0 (There is no ISO standard for Bicycle Headset Bearings).
This bearing has been made to Hambini specifications and manufacturing procedures. The types of seals, the grease, the contact angles and the materials have been specified to ensure optimum performance and continued reliability. The bearings are made in a ISO 9002 certified factory.
- Internal Diameter(mm): 30.5
- External Diameter(mm): 41.8
- Depth(mm): 8
- Internal Chamfer(degrees): 45
- External Chamfer(degrees): 45
- Material: AISI 52100 DIN 1.3505 SUJ2 EN31
- Seals: Double Rubber
- Seal Material: Nitrile (NBR)
- Grease: Shell Gadus / Mobil XHP / Petronas EP2
- Grease Rating: NLGI 2
- Alternative Part Numbers: MH-P08H8F, K845H8F, TH870E(FSA), MR121, ACB845F, ACB418F, MH-P08F
- Bearing with slight lip on inside chamfer, usually found on specialized bikes. The EXPOSED inner race of this bearing has an Ra6.3 surface finish due to the requirement for an inner lip. Discoloration may occur. it does not affect the operation of the bearing.
Notes:
- Made to Hambini Specifications
- The majority of HPE headset bearings are made in Taiwan
- 1 Year Warranty (this does not cover wear)
- In the event of a HPE bearing being unavailable, you will be supplied with a bearing from the German company ZEN
The Hambini Difference
HPE bearings are finished in a 3 step process that involves multiple grinding stages followed by 2 – stage superfinishing of the raceways. This is accomplished with the use of Saint-Gobain Norton abrasives in an ISO registered factory. Superfinishing results in smoother running surfaces and smoother bearing rotation. Whilst vibration levels for headset bearings are largely irrelevant, vibration does correlate directly with the quality of the bearing. HPE bearings typically exhibit 30-40% lower vibration than competitor products.
The grease in HPE bearings is a heavy duty NLGI 2 grease. Headset bearings will never complete one rotation in their lifetime and generate little to no heat. The bearings have a 90% grease fill rate and has water repelling properties. A thick, pure marine grade of grease has not been used owing to the widely documented propensity for thick grease to develop cavities and thus provide no protection. This is exacerbated by the lack of bearing rotation meaning their is little opportunity for heat generation to turn the grease from semi solid material to fluid.
Each Bearing has been designed from the ground up, they are not derivatives of 6000 and 7000 series bearings that have been modified to suit the boundary dimensions. The contact angles, ball sizes, cages and races have been designed for the load characteristics.
Bearing Quality
There is a considerable difference in the quality of headset bearings. Many bearings that are imported from the far east feature raceways that are neither hardened nor ground. Notice the picture below showing pinch marks where the material has chipped away (coloured orange) and poor finishing (circumferential groove).
The pictures below show Hambini Headset bearings as a comparison.
Need some Help?
Additional information
| Inside Diameter (ID) | 30.5 |
|---|---|
| Outside Diameter (OD) | 41.8 |
| Bearing Thickness/Height | 8 |
| Chamfer Angle (Internal) | 45 |
| Chamfer Angle (External) | 45 |
17 reviews for MH-P08H8F Headset Bearing 30.5×41.8×8 45/45 1C2 K845H8F TH870E(FSA) MR121 ACB845F ACB418F MH-P08F
Q & A
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.
Error
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.
Error
An error occurred when saving your answer. Please report it to the website administrator. Additional information:
Kev g –
Competitively priced and came quickly. The bearing was of decent quality too, I have bought many over the years and the seals on this one are much better
Ed Betts –
I initially contacted Hambini because I was getting a strange clunking from my SL6 under braking. I had been to several bike shops to no avail. He asked a few questions by email and then I sent him the bearings from the headset. He did his analysis and measuring and came back with a comment that the previous bearing had a poor Lip fit on the upper headset which was causing the clunking.
He recommended this bearing and measured it personally so I got one that was at the correct tolerance for my fork. I’ve since fitted this and had no problems. The clunking has gone and I have ridden over 1000km.
I had spent almost £100 in bike shop labour charges to resolve this issue and Hambini solved it for no charge, with no stress. The original suppliers of the bearings who were [NAME REMOVED] were of no help and did not want to admit any liability or offer a refund.
Hambini’s service is like nothing else. His YouTube persona is one thing, the service as a professional engineer is worthy of a £5k frame let alone an £8 bearing. He doesn’t mess around and gets the job done politely and courteously. I can’t recommend him highly enough.
Andrew J. –
Replaced my headset bearings with these. Of the many on offer I chose Hambini because I believe, knowing Hambini’s reputation, that they will be top quality. They seem to be. I’m no expert. He is.
Gary Williams –
Fab!!
COLIN H. –
roland schuetz –
Excellent product
Thomas R. –
Great bearings, fit like a glove.
Greg –
Perfect fit very good quality
Dieter Van Giel –
Giulio Carlo Venturi –
Andrew Foxton –
David T. –
Perfect fit. Well engineered replacement headset bearings. I followed the comprehensive and straight forward guide on the Hambini website to select and very pleased with purchase.
Simon Baker –
Perfect for the job- quick delivery, quality product
Anonymous –
Andrew –
I bought these for a bike mechanic to fit – very impressed with the quality and delivery from Hambini was extremely quick and efficient
RM Dixon –
Excellent quality bearing.
Kevin M. –
Better quality than the original (and very difficult to find) Colnago bearing it’s replacing—and at a very reasonable price with fast shipping to the US!