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post #6 of (permalink) Old 31st August 2014
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Re: Rear wheel bearing fitting..right or wrong..

You have to remember when a brake drum gets hot in use so also will the bearing so in fact there is very little difference in the temperatures of both.

It's not just the temperature difference it is the rate of change in the temperatures that creates fissures in the metal which can then lead to metal fatigue. Rapid changes in temp can have devastating effects unless the metals and design if the components are manufactured to match. That's one of the reasons why aircraft engines are so expensive.

Most brake drums are made from cast iron which in itself has a crystalline structure and that in ityself means it is susceptible to cracking.

I haven't seen the BMW headstock but I would expect it to made from a good quality steel. And if that is the case then it wouldn't be a fair comparison.
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