Bottom Brackets

  1. Bearing price increases

    SKF, NTN, Schaeffler and NSK have all had their bi-annual price increases this month. Due to the continued devaluation of the UK pound, the rate is much more than it has been over previous years. Regrettably, I am having to pass the increase on. 

    Bottom brackets will be increasing in price in the new year. 

    Thanks

    Hambini

    Read more »
  2. Aero Bike wheel test... The fallout

    Those of you who are avid viewers of a number of Internet forums will have noted that some results from my bike wheel wind tunnel testing have been contested and criticized. The ultimate result was I ended up getting banned from weightweenies for a week for calling Tom Anhalt of bike blather a spec of shite on the anus of humanity and a letter went from Flo Cycling to my HR department to ask for me to get the sack.

    One of the advantages to not being in the bike industry full time is I don't really give two hoots about brand perception and I'm more than happy to tell someone where to poke it when they are talking from their rear end.

    The Background

    This story starts off with an innocent enough beginning. One of my colleagues was doing an IronMan race and needed the fastest wheels. So some testing was performed. The difference was as a group of aerospace engineers, we probably have a better understanding of airflow than bike companies whose primary aim is to

    Read more »
  3. Ceramic Bearings vs Steel Bearings... An Engineering Opinion

    One of the most controversial topics in the cycling industry is with regards the topic of Ceramic bearings and whether they do or do not reduce friction dramatically in riding. This article will address some of the concerns and topics associated with this debate and quantify the numbers.

    Bearing Terminology

    Internal Bearing construction - Ceramic bearings are not 100% ceramic

    Ceramic bearings are in actual fact hybrid. They use ceramic balls and usually a steel inner and outer race. The ceramic balls are often silicon nitride or equivalent. Steel Bearings are commodity items that are composed of hardened steel balls and a steel inner and outer race. Geometrically, the contact points, inner and outer dimensions and thickness between steel and ceramic bearings is the same so they are interchangeable. The only real big noticeable difference between the two is the bearing cl

    Read more »
  4. Appearance on GCN

    I was recently invited to appear on the GCN Tech YouTube Channel. You can see my performance below. I had a great day there, it was fantastic!

    Some of the content was edited out, the original recording was probably in excess of 1.5 hours so I will make a video to cover some of the questions that had not been answered as thoroughly as some of the commenters wanted

    Read more »
  5. Bottom Bracket Pressfit and Creaking- An engineering Opinion

    If you are reading this you will have probably already come across the numerous posts by various individuals in Internet forums across the web.

    The issue of creaking bottom brackets has been blamed on the introduction of pressfit and directfit bottom bracket standards, where bearings either push directly into the bike frame or push into cups which are then pushed into the bike frame.

    General guidance varies from taking everything out and regreasing it to installing with extreme measures such as epoxy resin.

    Pressfit is not the problem and threaded is certainly not the answer...

    The reality is pressfit has nothing to do with creaking. There are many areas of a bike where bearings have a pressfit and there are no problems. For example, wheels, freehubs, pulley wheels and some headsets are pressfit yet they don't generally creak.

    The basic reason for the creaking is one of two reasons, either a poor fit or misalignment. Often, the two occur at

    Read more »
  6. Professional Bike Engineering Tools

    This video which I have posted to youtube gives you an overview of some of the tooling I have which assists in making bike/car parts. Watch and Enjoy!

    Read more »
  7. Case Study: Fixing a Trek Madone BB90 Bottom Bracket

    In this video, I take you through the engineering that I went through to fix a Trek Madone BB90 bottom bracket. You get to see some of the real engineering decisions involved in trying to get a fix at a reasonable cost. 

    Read more »
  8. Filament Bike Frames - Warranty

    Please note, I will not warranty the fitting of any Hambini Bottom Bracket on any bike frames made by filament bicycles. A recent experience involving a customer with a frame has led me to believe the quality control and assurance practices they use are not in line with engineering best practices. Furthermore, the way the individual in charge of the company deals with issues is sadly lacking. 

    Read more »
Hambini Engineering, Unit 11386, 13 Freeland Park, Wareham Road, Poole, Dorset BH16 6FH UK