What would be the best upgrade for a cube gtc sl

Dcp
Posts: 9
Hi, I have a cube gtc sl 2012 and live in the peak district. I'm looking to upgrade bits to help with the hills this year. Would I be better improving the wheels ( to mavic krysium elite s) or simply the cassette from 11-25 to 12-28? Thanks. David
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Comments
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Train yourself rather than change the bike- unless the bike is so overgeared that you cant train properly.
Swapping the cassette isnt an upgrade - its just a modification.0