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Old 09-16-08, 02:33 PM   #1
rabidsquirrel
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Crank compatability

I've been thinking of switching from a triple to a double on a 2007 Trek 1500. I have looked at some cranks on e-bay and noticed that most say 10 speed compatible. Will these also work with a 9 speed cassette? I'm not sure what else I would have to change. My bike has 105 shifters, an Ultegra long cage rear deraileur, a 105 front deraileur, and presently an Ultregra triple.
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Old 09-16-08, 04:34 PM   #2
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A 10-speed crank will work with a 9-speed cassette. But you will have to change your front shifter to a double.
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Old 09-16-08, 04:47 PM   #3
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I've been thinking of switching from a triple to a double on a 2007 Trek 1500.
Why? [ <-- not a frivolous or rhetorical question.]
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Old 09-16-08, 04:53 PM   #4
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Why? [ <-- not a frivolous or rhetorical question.]
Too much shifting and I'm sick of hearing that chain rattle. And everyone else seems to be making it up the hills around here just fine with a double. I know I can make the rattle stop with the second click of the shifter on the middle chain ring.
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Old 09-16-08, 04:56 PM   #5
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A 10-speed crank will work with a 9-speed cassette. But you will have to change your front shifter to a double.
Thanks. What's the meaning of I thought Trek was the Trek of bicycles?
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Old 09-16-08, 05:08 PM   #6
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A double isn't a magic bullet. Honestly, a double is simple a triple with one ring amputated.


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Too much shifting
??? In other words, you use the granny. Try not using it and see how well you do. I ride with people that fly up hills. Doesn't mean I can fly up hills (or is that distinction too subtle?).


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and I'm sick of hearing that chain rattle.
That's an adjustment issue. I know some mechanics adjust the FD so trim is required, but that's not necessary. A properly adjusted triple should shift just like a double - even better since the chainline on the middle ring is perfect.
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Old 09-16-08, 05:45 PM   #7
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Thanks. What's the meaning of I thought Trek was the Trek of bicycles?
http://www.bikeforums.net/showthread...29#post7377529
Number 2 and 8
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Old 09-16-08, 06:26 PM   #8
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But you will have to change your front shifter to a double.
Nope, 105 9 speed front shifter handles double and triple. Only 9 speed dura ace was 2 or 3 specific. Gonna also need an external bearing bottom bracket for your new crank. Might look around (Nashbar, eBay) and try to snag a NOS 9 speed 105r double crank for under 50 bucks)
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