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Old (top) and New (bottom) chains at 12 inches

Notice that the new (bottom) chain's pin center is aligned exactly with the "24" mark (12 inches), but the worn (top) chain is elongated 2/20 of an inch, or about 0.83%. Rule of thumb suggests chains should be replaced before they become elongated by 1% or longer, that the drivetrain (sprockets and rings) can become damaged by running a chain with more elongation.

2011/03/19 14:08:14

Exposure mode: program (auto)
Metering Mode: matrix
Exposure time: 0.0042 s (1/240)
Aperture: f/2.8
Focal length: 8.0mm (35mm equivalent: 37mm)
ISO: 100
Flash: No
File size: 1168693 bytes
Camera maker: FUJIFILM
Camera model: FinePix F10
Resolution: 2718 x 1813