Hi, I have a 2006 Trek Madone 5.2 with Shimano Ultegra 10 speed groupset. It currently has a 39/53 up front and a 12-25 in the rear. I live is a very hilly area and find that I run out of climbing gears on my rides. Is it possible to simply swap out the cassette (and maybe chain) for a wider ratio of gears, or would I need to do more?
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