I'm on a 2015 Cervelo p3 that has the stock FSA Gossamer 52/36 172.5 BBright crankset. I want to move to 165 and in my simple mind I should be able to just replace the crank arms, but that may not be the case. What do I need to be taking into consideration from a mechanical standpoint to make the switch, ideally without completely changing the bottom bracket - but if I have to do that then I'll go ahead and do that as well. Am I only able to look at FSA products? What else is compatible?
Making the switch due to hip/low back issues that are getting more and more difficult to keep in check with 5-10 minutes of stability work/day.
Thanks for any guidance.