Bike Low Spacer Washer Bottom Bracket Gasket BB for Flywheel Speed Cassette MTB Road Hub Headset Flywheel Cycling

Help prevent shaking from uneven surface.Use this washer as a BB spacer and to fix the chain line on a fixed gear bike.
The shims help the chain not rubbing on the tire.Allows you to maintain a correct chain-line.This is perfect to add just a tap bit of spacing to your mid-drive motor.
Great at replacing spacers between cogs.Perfect alignment,no deraileur adjustment needed to switch wheels to a wheel with a 9 speed cassette on a 9 speed hub.
Let your crank arms rock side to side easily,and it only takes 10 minutes to remove the crank and cup,put on the spacer and rebuild.
Shifts smooth,no play,and doesn't catch on the back stroke.You could swap wheel sets without adjusting the rear derailleur.

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