TooTallUK, I cannot tell if troll or serious?
The power you generate on the bike has very little to do with weight or size. If it did, pro cyclists would all be 6'6" and 400lbs..
You are stating that a 150lb rider standing, mashing up a hill, will generate the same forces on the drivetrain as a 275lb rider? The physical act of me standing up and applying my weight (weight only) to a crank arm = nearly double the force of a 150lb rider doing the same. Heck, the force required to even get me up a hill is nearly double.
The reason pro's are not 6'6" and 400 lbs also has a lot to do with physics. Easy comparision. A cadillac vs. mini cooper on a road race course. Cadillac requires lots of power to get up to speed, keep up to speed, brake, turn. It needs a much larger moter, much heavier components, much more room to move around, larger brakes etc....
A Mini Cooper is small, nimble, weights much less therefore requires much less to move it around a track.
According to your logic, you are implying that the same force required to move 150lb load is equal to the force required to move a 275 lb load? That is false. If we lived in ZERO gravity, this would be true. I am not riding a moonlander, so that logic does not apply.
So - what were you doing? Mashing the same big gears up every hill? Hucking big jumps with a too-short chain and bad landing technique? Bad spannering? .
The situation is rooty rocky flat to large steep hill. Standing on this is common for many riders here, as it is also rooty and very rocky, so sitting is difficult.
Bad spannering (had to look this up) is not out of the question, but I have a pretty new KMC chain, and the cassette was hanging on a brand new PRO 2 hub, tighten down to spec.
Materials do not just give up and fail - something has to be putting them under unusual stresses and that isn't usually from riding a bike using smooth gear changes and a flowing technique. .
Materials just don't give up and fail. I will spread the news to engineers everywhere, their worries are over!! :madman: :nono:
The stresses you are reffering to are simple. I am using a cummings deisel on a drivetrain mostly designed for a Honda four cylinder. :thumbsup: