Carrot Tread

Chain Guide Assembly Instructions


Selective laser sintering has amazing precision but it's still not enough for super-fine details like screw threads. So you'll need two metric M5 nuts and screws.

Stainless nuts and screws

Usually both can be found in your local hardware store. Nuts should be M5 DIN 934 hex nut, 4 mm thick, those are most common.

Screws should be M5 with 10 mm thread length and 8.5 mm (or less) head diameter. DIN 84 are ideal. Or you can use disc brake rotor screws from you local bicycle shop, just make sure that it's heads isn't too big.

Screw head should be 8.5 mm or less

You can use almost any nut and screw material. Stainless are fine, but you also can get alloy or nylon nuts and screws and get assembled chain guide weight below 15 g!


So here are 3d printed plastic parts you've received from Shapeways. At this stage you can paint it into your favorite color. Or leave it to be pure white:

Plastic parts

Now you should install the nuts into corresponding sockets in the chain guide clamp and the cage. Take a nut and push it into clamp socket:

Push a nut into clamp socket

It's designed to be a tight fit so you might need to use a screw and a screwdriver to pull the nut into its socket:

Use a screw and a screwdriver to pull the nut into its socket

The nut is in place:

The nut is in place

Get a second part of the chain guide clamp. It has a hinge joint:

Clamp hinge joint

Push a hinge cylinder into corresponding socket:

Hinge joint assembled

Let's now get to the cage. Place another nut into the cage socket:

Cage with nut

Again, use a screw and a screwdriver to pull it in place:

Use a screw and a screwdriver to install cage nut

Chain guide cage with installed nut:

Cage with installed nut

There is a sliding joint between chain guide cage and a clamp:

Cage and clamp sliding joint

This joint is tilted to provide cage adjustment to the chainline. Connect the cage to the clamp and use a screw to secure it:

Cage and clamp sliding joint

Assembled chain guide:

Assembled chain guide


Now go to the bike and remove a chain. Fasten your assembled chain guide on your bike set tube, just in place of a front derailleur. Loosen the cage-clamp slide screw and adjust cage position so your chainring will be just in the middle of the cage. After that adjust chain guide height by moving the clamp higher or lower on the seat tube. And finally install back your chain passing through the cage. Go ride your bike and have fun!

After all it should look like this:

On bike

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