Chain Keeper

This is designed to hold a Miche fixed track sprocket for a 1/8th inch track bike and is intended to keep the chain in place while transporting your bike without wheels.

There is a 22mm diameter space to hold a standard skateboard bearing.

You need to print TWO of these to hold the sprocket in place, along with two 22 x 7 mm bearings and a seat post quick-release skewer to hold the whole thing in place.