This product is only for Peloton Bike/Bike Plus models, not other models. Made of chrome steel, it is durable, smooth, low-noise, and can be used for a long time. And there are protective shields on both sides of the bearings to block the entry of contaminants, ensuring long-lasting performance and reliability. When your bike makes a "rumbling" sound or the crank/pedal rotation is not smooth, it may be that the bearing in the hub or belt tensioner assembly is damaged and needs to be replaced in time