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In terms of drag caused by a bicycle rider, the biggest loss is caused by the rider themselves followed by the wheels and frame.

The drag caused by wheels is significant because of two fundamental reasons. The first is they hit the air first as they are the most forward part of the bike and second because they are rotating. The effective air speed at the top of a wheel/tyre is double the indicated speed of the bike.

In the bike industry, wheel aerodynamic testing has generally been conducted by two groups of people - Wheel manufacturers and journalists. Wheel manufacturers will usually adjust tests to make their particular wheels look more favourable than their competitors in testing. This is usually achieved by a combination of adjusting speeds and angles. The reality is this type of test is not impartial.

Journalists on the other hand tend to visit their local university and ask some clever boffin to conduct their testing for them and give them t

Due to some reasons beyond my control - Donald Trump. I have had to increase the prices on some items which are affected by the metal tarrifs that have been imposed on imports into the EU. Thanks Hambini

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. 

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. 

The youtube channel has been a bit dry over the past few months. New content is on it's way. I'm in the process of filming it and editing it. Stay Tuned! Thanks Hambini

The homepage now has a blog where I will detail topics of a technical nature! If you've got a query, please drop me a line. Thanks Hambini