The technical implementation of the "Stfu" is simple: a type of plastic loop surrounds the chain and keeps it in check. This loop is attached to the chainstay and is elastic towards the bottom so that it can give way in the event of a "chain slap" and cushion the chain movements.

The visual implementation is a little more challenging: these loops take some getting used to. And are reminiscent of the early days of mountain biking, when Shimano's Shark Fin, for example, was designed to stop the chain from dancing the tango too much.

The "Stfu" is available in four different versions, for various downhill and enduro bikes. When looking at the assembly instructions, it also quickly becomes clear that some manual dexterity is required to assemble the device properly.

The list of riders who rely on "Stfu" is impressive. Aaron Gwin, Matti Lehikoinen, Rémy Métallier and Neko Mullay, for example, have fitted the silent maker to their chainstays. Mountain bike legend Chris Kovarik is responsible for the product.

https://stfubike.com/