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I live in Denver and ride alot up in the mountains (many sustained 15-20% climbs at altitude), and would like to dump my Ritchey WCS Compact Crank (50-34) (the original double was a 53-39 Ultegra) for a Ultegra Triple. My rear cogset is a nine speed 12-27. My components are all Ultegra (circa 2003). My question is will I need to change anything other than the crank, and if yes, what?
 

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Front deraileur. Triple BB (unless you get one o' them new-fangled integrated cranks). Rear deraileur- you need a long cage model to deal with the extra chain wrap. I think that 9sp Ultegra left shifters are all triple shifters so if that's true you are saved from having to buy new shifters.
 
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