Handmade in Boulder, CO, Butter’s B1 chain holder classes up the dirty act of chain maintenance.
Made of machined billet alloy, the chain slides across a lathed Delrin spool. The whole thing is held in place with a strong spring and steel axle.
Butter says they’re also great for travel, keeping the chain in place inside a bike case (assuming you don’t remove the rear derailleur, anyway).
They retail for $40 each, including shipping. Add $5 for international orders. More pics below…