What old cycling technology would you like to see combined with new cycling technology?

[Drago]

LiOn powered dynamo lights.

 

[Ming the Merciless]

Super conductor dynamos so you can emit death rays from the lights on your bike.

 

[Ming the Merciless]

LiOn powered dynamo lights.

B&M already make lion equivalents of some of their Dynamo lights.

 

[Drago]

Leather faced disc brake pads for sublime wet weather performance.

 

[Ming the Merciless]

Some form of e ink GPS display that you can read in strong sunlight and at night.

 

[Ming the Merciless]

A spider silk type mudguard that weighs about 25g and doesn’t rattle.

 

[Vapin' Joe]

Chrome plating on carbon fibre.

 

[classic33]

Hydraulic rod brakes?

Electric penny farthing?

Carbon fibre gas pipe?

 

[raleighnut]

Fully 'bushed' chains

 

[Drago]

North road bars on a modern trials bike.

 

[Hover Fly]

Fully 'bushed' chains

Some Wippermann chains are
https://www.connexchain.com/en/product/connex-7e8.html

 

[Jenkins]

Di2 downtube shifters

Press fit square taper bottom brackets

 

[Jenkins]

Coaster (back pedal) disc brakes

 

[Mike Ayling]

North road bars on a modern trials bike.

Presumably in the inverted position.

 

[Solocle]

Super conductor dynamos so you can emit death rays from the lights on your bike.

1 watt of 555 nm light (laser beam green) gives you 683 lumens. So a 6V/3W hub is going to maximally give you a smidge over 2000 lumens at 100% efficiency. Hardly death ray territory!