4.5 mm spacer to fit a 7-speed cassette onto a hub made for 8-, 9-, or 10-speed cassettes. If your cassette has bolts holding the sprockets together, you will need to remove the bolts. They are not necesssary, only intended as a convenience for rapid cassette swaps.
Note: This version features two conical spacers that will keep cog more rigid. Place cog between the flared ends of conical spacers. Converts a Shimano 7, 8 , or 9 speed freehub for use as a single speed. This set of spacers allows the single speed sprocket to be easily aligned with the correct chainring.
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