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9 speed double and 9 speed triple

Old 05-09-06, 11:42 AM
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steve001
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9 speed double and 9 speed triple

while looking at cranks on nashbar I came across that there are both 9 speed double and 9 speed triple cranks. I simply don't understand this. I can understand the double making the bike nine speed, but wouldn't the triple make the bike 12 speed or something like that?
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Old 05-09-06, 11:45 AM
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TYB069
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Okay you are half right. Nine speed usually refers to the cogs on the back. Hence nine speed double would be 18 and triple is 27.
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Old 05-09-06, 11:49 AM
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steve001
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thank you, you just made everything super clear
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Old 05-09-06, 12:49 PM
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Originally Posted by steve001
thank you, you just made everything super clear
Happy to help.

Edit: Make sure everything is compatible with you setup. Sometimes double cranks do not work with triple shifters and vice versa.
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Old 05-09-06, 03:01 PM
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That's true, and sometimes certain cranksets don't work with the bottom bracket you have, and other parts of the drivetrain.
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Old 05-09-06, 05:40 PM
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Originally Posted by steve001
while looking at cranks on nashbar I came across that there are both 9 speed double and 9 speed triple cranks. I simply don't understand this. I can understand the double making the bike nine speed, but wouldn't the triple make the bike 12 speed or something like that?
The '9 speed' in this case refers to the width of the chainring. 9 speed chains are narrower than 6/7/8 speed chains. They need to be because the cassette spacing is narrower. The 9 speed chains will actually work on 8 speed chainwheels but an 8 speed chain won't work with a 9 speed cassette. Not happily anyway. So a "9 speed" crank is made to work well with a 9 speed cassette and chain.
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