My mate put his rear mech into his wheel when I was out with him once. He destroyed the mech, broke several spokes, mangled the chain and snapped his gear hanger off. He had to borrow my bike to ride back to his car while I guarded the wreck of his bike.

I wore the entire ‘transmission’ out on my MTB by leaving a chain on too long. It’s much cheaper to change chains more frequently!

I’ve pitted the cups and cones on the Campag Proton rear wheel of my Cannondale by not noticing that the locknuts had come loose and riding a couple of hundred miles like that.

If I had the money, I’d put my bikes in to my LBS a couple of times a year for servicing.

When I was out with Shaun, I noticed that my front brake blocks were almost worn down so I’ve just replaced them. I neglected to do that on my first MTB once, trying to get just one more ride out of the blocks. They wore out on a fast dangerous descent and I destroyed my front wheel braking metal-on-metal!

I’ve snapped loads of cranks,
The springs always go in my rear mechs or I manage to put them into my rear wheel.
The ratchets always fail on my shifters
The springs go on my brake calipers.
The bearings go in everything.