![]() This standard was heavily patent protected and to this date the Shimano crankset system is probably the best. Shimano designed their Hollowtech 2 system to use 6805 bearings, this is a popular size and had a load rating that is ample for most bottom bracket bike usage. The cycling media who are effectively an extension of the big bike supplier’s marketing departments also skipped over this troublesome issue.įundamentally, any type of modern bottom bracket is a press fit, the bearings always press into the housing (the majority of cranksets) or press onto the crank axle (Campagnolo). Many bike shops also did not have the tooling or measuring equipment to check for these abnormalities. The consumer has long lived with this because they did not have the ability to check these things or were aware of them. ![]() As an example an injection molded Lego brick has tolerances that are 5 times tighter than modern bikes. ![]() That statement is somewhat caviler as a certain amount of ovality and eccentricity (the engineering word for out of alignment) is permitted but these manufacturers generally fail to meet these basic engineering tolerances which you would find in a typical food blender. The finished products rarely have round holes that are aligned with each other. Creaking bottom brackets are fundamentally the result of bike manufacturers reducing their costs to the absolute minimum and neglecting some geometric locating features during the manufacture of their frames.
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