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I am looking at these components and am wondering what does double and triple gear shifting mean?

Shimano R221 Double Gear Shifters 8 Speed

Shimano R221 Triple Gear Shifters 8 Speed

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up vote 3 down vote accepted

Double and triple refer to the number of chainrings (front gears) that you have.

Here are the detailed service instructions, which allude to this fact:

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Thanks, now I can buy the correct one! – Valamas Apr 8 '12 at 7:32

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