Bike Flywheel Cassette Spacers Sprocket Hub Washer Flywheel Gasket 1/1.5/2/2.5mm
Standard 8/9-speed hub bodies do not require spacers when paired with an 8/9-speed cassette;. Standard 8/9-speed hub bodies require two 2mm spacers (at position A) when paired with a 7-speed cassette;.