Warning: Counterfeit/B Grade SKF and NTN bearings

I have had a number of cyclists contact me with issues around NTN and SKF bearings being fitted at bike shops and failing within a fairly short period of time. A number of these cyclists have sent me the bearings back to look at and I have found a large number of bearings to be counterfeit or B grade. Counterfeit Bearings These bearings are units that have been made by a third party and then subsequently badged with a named brand eg SKF,…

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Bottom Bracket Pressfit and Creaking, an Engineering Analysis

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.…

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Ceramic Bearings vs Steel Bearings… An Engineering Analysis

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. 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…

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