^ not 100% sure I agree with this, as I am about 270, and the BB on my thunderbolt is from factory. My commuter bike has been in service since 2013 or so and the bottom bracket has yet to fail; although I am having some creaking sounds from the BB area; however, it comes and goes and it still feels the same as ever.
but in general, if you are riding a bike really hard and you are above 230 geared up, then yeah some extra strain on gear so to me it makes a little more sense to buy quality parts/go up a level from the base level
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