Hi all,

My bike came with the following crankset:

Shimano Ultegra SL HollowTech II 175mm crank arms w/7075 CNC 39/53T Chainrings

I want to use 172.5mm crank arms. Do I need to swap out the whole crank set or can i just replace the arms with ones that mount in the same manner? Is there any disadvantage to just replacing the arms? Is there anything that I should know before doing this?

Thanks,

Brian