non-split clamp brackets on shimano brake levers
losing EVERYTHING when i'm fixing up a bike – i KNOW i have 3 spare sets of brake pads, and a suitable tube for my 29er – i've SEEN them in the past week, but i cannot for the life of me find them now.
removing chainrings from cranks, with that silly wired little chainbolt removing tool, and the constant cuts in my hand from the chrinring teeth when it slips
tubeless – just can't be arsed anymore, changing tyres is such a shit job when tubes are so much easier (i rarely puncture)
cartridge bearings – cup and cone are so much more reliable ime.
putting tools down and then forgetting where i put them. drives me nuts.