As I teenager and then poor uni student, I rode a number of bikes or bike parts to failure.

I first snapped the top tube of a stell framed BMX near the stem after many years of using it for a local paper round with a milk crate roped onto the handlebars. The weight of the papers was certainly a contributing factor.

I've snapped a chain while out of the saddle, accelerating a road bike. Nothing too serious, just banged by knee on the bars. Still, do not recommend.

While riding up a long steep hill, I snapped the nut off the outside of a clipless pedal. Luckily the pedal didn't slip off the axle and I could get to a safe stopping point.

I had a carbon top tube delaminate from some aluminium lugs near the stem. Something felt off with the handling so I glanced down and could see ~1.5 cm of the lug showing. Decided to walk the bike the rest of the way to work that day. Got a local carbon repair specialist to re-bond it and it lasted a few more years.

That carbon frame eventually developed a crack in the bottom bracket and frame from front to back right next to the seat tube on the chain ring side. When it failed, the bike started feeling "noodly" to ride, so I looked down and saw the crack opening and closing as I pedaled along.

Somehow I snapped the rear suspension pivot in a Trek Y3 without realising it until the next time I went to ride it. I jumped on it to ride to uni and something felt off. Then I noticed the front and rear wheels were both tracking straight but significantly offset from each other. Took a while to get it repaired as it was a custom part.

When borrowing my brothers (pre-suspension era) MTB I tried a little jump up a kerb. The front fork folded in half. I bent it back straight enough to get sufficient wheel clearance to finish the ride (slowly).

I have buckled many rims over the years on BMX, MTB and road bikes. The early aluminium rims were expensive and really easy to buckle compared to steel rims.

Had the freewheel pawls fail in a rear cassette suddenly one day. They would catch once every few pedal rotations for maybe 1/3 of a rotation. Initially I thought I'd dropped the chain. It was a long walk home.

I was having trouble keep my front QR wheel on a road bike from vibrating mildly as I rode on it. I thought the bearing were loose, so I took the wheel off then found the hollow QR axle had snapped in the middle.

From riding with many others over the years, I'm also aware that larger (taller) riders can break stuff more easily as well. One work colleague who was probably 6'3-4" snapped a cog off the rear cassette almost perfectly in half while accelerating. He wasn't a strong rider, he'd started bike commuting a few months earlier. Maybe the crank length he needed brought extra torque.

Another very strong 6'1" guy I rode with for a few years cracked 3 carbon Bianchi frames within the first few months of owning them. All replaced under warranty. I think he was just heavier and stronger that the frames were generally designed for.

Frames are typically weakest at the joins as that is where the stress is concentrated.

Any rotating part will eventually wear and fail.

Ride a bike long and often enough and something _will_ give out.