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Tranny Idler Sprocket
Fixed Axle Go Kart Bearings
Use on #35 chain as a tensioning or routing device. 19-tooth idler has precision ball bearing with 5/8in. bore. Made of Aluminum Outside Diameter: 2 1/2in.
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If you want to get fancy and use lots of chain, you will probably benefit from an idler sprocket.
Some people have elaborate gearing systems where they take the chain pressure off with the idler, then move the chain from one sprocket to another right next to it.
To compensate for the different size, the idler sprocket is spring loaded and puts tension back on the chain when engaged.