helouwn

I've got an older Cannondale SuperSix Evo Ultegra Di2 (Ultegra 6770). I think it's a 2013. It is equipped with Cannondale Hollowgram SI cranks and FSA Chainrings (50/34). While there are newer bikes out there, I love this one, and I don't really want to explore a new bike.

The chainrings are definitely worn and need replacing (the chain is starting to slip more than I'm ok with, and the tips just look worn). I was looking for some advice on what to replace them with. I've been told by a lot of people that the FSA chainrings aren't that great, and that I may also want to look into different "sizing" (I don't know the right word). In a prior thread, just related to that question, the consensus seemed to be that I probably wouldn't notice a move to 50/36. Is there something else I should be looking at?

The cranks aren't in terrible shape, but they aren't in great shape either. I was thinking of going ahead and replacing those as well. They are 170 mm.

Complicating things is that I've been considering outfitting the bike with a power meter. I use TrainerRoad on my indoor trainer quite a bit, and I've gotten used to gauging the workout / ride based on power. Would it make sense to let that influence this decision (ie, get a chainring or crank power meter)?

Thanks in advance. This forum has been hugely helpful.

Will

Seattle Forrest

Absolutely makes sense for that to inform your decision.

Look into Power2Max.

Kimmo 

Sounds like maybe you're not aware of the chain wear threshold of 1/16"?

Keep your chains clean and change them before they get too worn, and your rings should last ages.

helouwn

I was not. I'm a bit new to trying to take care of things myself. In the past, I have generally taken it to my LBS for all maintenance.

Sounds like I should be getting a new chain, too.

Will

helouwn

I was looking at the Power2Max NG ECO. But it looks like I can get one that fits most any chainrings and cranks. It does look like a good, cost effective power meter.

Will

Kimmo 

You're also gonna need a new cassette. New chain jumps on a worn cassette, and new chainrings skip under a worn chain. You can kinda get away with a worn chain on a new cassette (except it causes wear) or worn rings with a new chain.