Warning: Counterfeit/B Grade SKF and NTN bearings

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Table of Contents IntroductionCounterfeit BearingsB-Grade BearingsSpotting a Fake bearingConclusions Introduction 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 […]

Specialized OSBB – Engineering Guide

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Table of Contents Introduction46 x 61mm OSBB Road Applications42 x 68mm OSBB Road Applications42 x 73mm OSBB MTB ApplicationsCranksets and OSBB Introduction A question that crops up frequently is with regards to Specialized’s OSBB bottom bracket and what size it is exactly. The short answer is OSBB comes in 3 variants which are all called […]

Bottom Bracket Pressfit and Creaking, an Engineering Analysis

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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 […]

Testing to Find the Fastest Bicycle Wheel Hubs

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The aerodynamic performance of wheels often grabs the headlines and the marketing budget but the reality is the hubs and the bearings within them will have more of a performance differential for the average cyclist. As an example, the power differential between wheels of an equivalent depth at speeds of less than 35km/h will only […]

Ceramic Bearings vs Steel Bearings: An Engineering Analysis

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Bearing Terminology

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. Table of Contents Internal Bearing construction – […]