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Old 01-19-07, 11:26 PM   #1
C_Heath
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upgrade triple to double 2005 trek 1500

What BB will i need?

Will the front deraileur be ok since its its for a triple? im switching to an ultegra double from the factory bontrager triple

thx u guys
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Old 01-20-07, 10:21 PM   #2
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thanks to all that responded.
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Old 01-21-07, 08:15 AM   #3
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thanks to all that responded.
Try the SEARCH feature of this forum. This question comes up at least once per week, no need to waste bandwisth with the same old discussion.
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Old 01-21-07, 10:54 AM   #4
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Try the SEARCH feature of this forum. This question comes up at least once per week, no need to waste bandwisth with the same old discussion.
Plus the fact that the system was down yesterday.

To answer the question, a triple derailer shouldn't have any problem with a double crankset. A double derailer will shift a triple but not that well. The thing to do, and this is what I do on all of my bikes, is to try it first. If it works, great. If not, change it.
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Old 01-21-07, 11:41 AM   #5
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There is also considerable debate as to whether it is an UPGRADE or not. You are losing a ton of gears and a couple ounces of weight.
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Old 01-21-07, 11:48 AM   #6
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Originally Posted by cyccommute
Plus the fact that the system was down yesterday.

To answer the question, a triple derailer shouldn't have any problem with a double crankset. A double derailer will shift a triple but not that well. The thing to do, and this is what I do on all of my bikes, is to try it first. If it works, great. If not, change it.

Thats why its called bike "forums" and not bike searches.

I dont use the small ring anymore thats all. The steepest grade I climb is 4.5 miles at 1000 feet. its not that bad but I use to have to use the small ring. Now, Im good and would rather have a double thats all.
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Old 01-21-07, 02:04 PM   #7
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You can expect people not to help you if you're going to be a jerk. Learn some patients.
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Old 01-21-07, 07:15 PM   #8
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Originally Posted by C_heath
Thats why its called bike "forums" and not bike searches.

I dont use the small ring anymore thats all. The steepest grade I climb is 4.5 miles at 1000 feet. its not that bad but I use to have to use the small ring. Now, Im good and would rather have a double thats all.
You could always just remove the inner chainwheel. Save the money for a new crank and use it on some other part.
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Old 01-22-07, 09:36 AM   #9
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triple -> double is a downgrade
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Old 01-22-07, 10:09 AM   #10
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^
Yeah, it's like asking to be upgraded from first class to coach. Even a double to a compact double isn't necessarily an upgrade. Especially in places like Kansas or Florida. Here in NC, it is though.
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Old 01-22-07, 07:04 PM   #11
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I just made the same change on my Trek 1500, triple to double, and it was a great upgrade for me. If there are no hills in you area, then by all means do it. It's not about how many gears you have, it's about how many gears you have in a good usable range.
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Old 01-22-07, 07:22 PM   #12
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Simplicity IS upgrading. I would recommend finding a comfortable chain ring , say a 39T and make it a 1x9 speed. Lose the ft derailler and shifter while you're at it.
To answer your question though about the BB length, you should just leave it as is unless you are intalling a Double specific crankset in which case the chain line will have to be adjusted for better shifting.
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Old 01-22-07, 07:44 PM   #13
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Quote:
Originally Posted by Portis
There is also considerable debate as to whether it is an UPGRADE or not. You are losing a ton of gears and a couple ounces of weight.
I was thinking the same thing
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