Teardown: ROTOR 2InPower Crankset 30mm
This Teardown covers the Engineering behind the ROTOR 2InPower 30mm Crankset. It focuses on the materials, manufacturing, tolerances,, bearing preload system and system stiffness.
Bottom Brackets
SRAM GXP Cranksets: An Engineering Guide
This article will cover the technical and engineering aspects of SRAM GXP. Sram GXP is a very popular crankset standard used by SRAM. It offers an industrial based bearing arrangement and was touted as having the lowest weight and rolling resistance of any crankset bottom bracket standard. The engineering will be analysed in detail. Currently…
Scott Foil gets roasted on the Hambini barbecue
This Scott Foil had it’s aerodynamic credentials severely burned on the Hambini barbecue. Staggeringly, the frame was the user’s second. The first was found to be out of specification. This frame was also found to be out of specification.
Hambini Bottom Bracket installed in a Cervelo frame
A Hambini bottom bracket user from Canada sent this link to their mechanic installing a Hambini BB into a Cervelo bike frame. The music and install are quite therapeutic!
Hambini Bottom Bracket in a Specialized Tarmac SL6
A Hambini BB user sent in this video of his Specialized Tarmac SL6 with a Hambini Racing BB30 to Shimano Bottom Bracket installed. As always, an unloaded spin test is not a good indicator of loaded performance!
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…
Bottom Brackets | Bearings | Reamings | Reviews | Technical
Hambini Roasts: Cervelo
If you are about to buy a Cervelo bike, watch this video. It shows the appalling tolerances the bike frames are made to. The bottom bracket pressfit specification is so bad, neither NTN or SKF will warranty their bearings in it. This particular frame had misalignment between the two halves of the frame body.
Pressfit vs Threaded Bottom Brackets
There are various camps out there on the internet that swear by threaded bottom brackets as a means to avoid creaking. This video below shows the pro’s and con’s of both.
Specialized OSBB – Engineering Guide
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 OSBB. 46×61, 42×68 and 46×73. A summary table is below, with the detailed drawings below that. Variant (Diameter x Width) (mm)…
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…
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