What "thing" from when you started, would be out of place now.

[Sharky]

Inspired by Vapin' Joe 's thread. If somebody from the past, time travelled to today, with their state of the art kit/practice, but would be completely out of place now.

Must be loads, but to start .....

L shaped cranks!

Drillium components, the practice of drilling chain sets, levers etc to save weight.

U turns in time trials.

 

[Ming the Merciless]

Racing Penny Farthings.

 

[Sharky]

Racing Penny Farthings.

True, but ......
The Beachy Head World Championship Penny Farthing Hill Climb Time Trial - Visit Eastbourne https://share.google/kXabyf46V8UDvCbG6

 

[freiston]

Cotter pins (I hated them)

 

[Alex321]

Cotter pins (I hated them)

I replace the screws holding the pads in my disc brake calipers with cotter pins as the first thing I do. Those screws seem to be made of putty, and are a real pig to get undone, while it takes seconds to get the cotter pins out.

 

[freiston]

I meant the ones wot fix the crank to the bottom bracket spindle.
Another candidate - hub lamps (of the "Salsbury" ilk)

ETA:

https://collection.sciencemuseumgroup.org.uk/objects/co25775/sperm-oil-hub-lamp-for-bicycles

 

[fossyant]

Racing Penny Farthings.

My mate still does it ! In Knutsford each year.

 

[Alex321]

The never-ready light set.
The headlight would just about light up a couple of yards of road

And the weird batteries they used