Derailleur Bicycle Gearing System Explained using LEGO

Derailleur Bicycle Gearing System Explained using LEGO

⭐️ This is my own design

A derailleur is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another.

The majority of bikes on the market today sport derailleur gears, which have been refined into simple, lightweight and efficient systems.

Gears are changed on the cassette (a set of sprockets installed on the rear wheel) by the rear derailleur. This shifts the chain up or down the cassette. As the derailleur moves to change gear, it forces the chain against ramps or steps, moving it onto a bigger or smaller sprocket.

The bike may also have a front derailleur, which shifts the chain between chainrings, which are part of the crankset.

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[DSZI.ShyHunterBB]

Can you show us how the gear shifter in a bike changes gears in Lego please?

[BD_Technic]

The video title is misleading… This isn’t a derailleur

[samwolens]

Would be awesome to see a shifter added to this. Maybe controlled by a servo motor linked to a stepper mechanism so it can be shifted by remote control? Im going to have a go myself, but it doesn't sound easy

[MSUTri]

It's a start, but it doesn't show the most important function of a derailleur - that is, the derailing of the chain it does to change gears!

Easier said than done in LEGO, but frankly you haven't shown the function of a derailleur at all. You've merely shown a multi-position chain tensioner, separately in each position.

[theadventurebiker]

Lame. I came here to see a Lego derailleur actually shifting the chain.
I want a refund.