Do you get the drivetrain wet and then take it through sand? What happened?
You probably need to use Park Tool cleaner and really work at it with brushes or you may have to pull the chain and cassette off the bike so you can get down inside every nook and cranny. Sand is very destructive to drive trains.
Did you get it in the bottom bracket? Usually sand just gets on the rims.




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and sad that i may not be able to ride tomorrow.
