Swapping Cranks?

puzzle
puzzle Posts: 54
edited April 2011 in Road beginners
A collegaue has a Boardman Comp (Shimano 105 rear and Shimano Tiagra front derailleurs) with a 50/36 front ring which is a Truvativ (SRAM crank).

Question is can he put on the crank and front rings from a Boardman Carbon (SRAM Rival) to make it 50/34 at the front or just swap the front rings?

I am guessing he won’t need to adjust or re-index the gears if this is carried out?

Comments

  • Monty Dog
    Monty Dog Posts: 20,614
    Just fit a smaller inner chainring - nothing else to worry out!
    Make mine an Italian, with Campagnolo on the side..
  • rake
    rake Posts: 3,204
    you need the bottom bracket as well to fit it. otherwise it will work.
  • Pokerface
    Pokerface Posts: 7,960
    rake wrote:
    you need the bottom bracket as well to fit it. otherwise it will work.


    Both bikes already running Sram chainsets by the look of it so the BBs should be the same. No change needed.

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