I had an extra spacer left after the installation was complete. Different thickness washers can be installed with the included sprocket to easily align the rear (wheel) sprocket with the front (pedal/crank) sprocket. The aluminum spacers and rear sprocket feel too light and a little flimsy. I'm sure aluminum holds up well and just "feels" brittle because my beach cruiser is a chunky steel frame. The wheel I am mounting this kit on has a 20mm wide rim (internal rim width). I recommend this product and would buy it again.
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