dirty bicycle drivetrain. gravel bike transmission in mud

bicycle chain sprocket cassette part equipment shiny metallic cycling transportation gear steel wheel teeth bike mountain metal mechanic drive macro cogwheel component mtb alloy vehicle closeup detail gearing circle link silver linkage cycle machine grunge road transport technology texture ride dirty derailleur gears activity chrome sport sports repair rain drivetrain gravel transmission mud after riding bad weather concept service outdoors rainy day drivetrain mud weather day