I’ve been thinking about acquiring a set of powercranks. I ride a fixed gear bike in the winter on occasion and was wondering how powercranks would work under this setup. Or, would that be a painfully bad idea?
they would spin at the chainring when you coast - you would no longer have a fix, you would have a singlespeed.
i love singlespeeding off road, but singlespeeding on road is not so fun - pedal pedal coast gets old.
if you are new to powercranks you will be hating life, as you will be wishing and crying to heaven above for a BIGGER gear. you will weep with agony. it would be fun to watch, tho, for perhaps your spouse or maybe a training buddy.
It would be an effective tool if you are primarily interested in getting your cadence up quickly. It would not be optimum for IM or long distance training. I think many track cyclists take this approach.
Many customers have done so and I haven’t gotten any “tell others to don’t do it” reports back. Make sure you have a brake on the bike as you can’t back pedal.
Frank, "Make sure you have a brake on the bike as you can’t back pedal. " That is classic. I can just see it. A track dude on gets the bike equiped with PC’s revved up to 60 kph as he rides with the boys in the team pursuit, but gets up to speed faster than his teammate in front of him. Unable to break, he takes out the entire team 
thanks Frank. By the way, my tri bike has campy 10sp and my road is 9 sp ultegra - not very optimal, I know. Since I do 95% of my riding on either the fg or road and save the tri for racing, I suppose it only makes sense to buy pc’s that are shimano compatible and save race day for normal cranks. This has probably been discussed before, but do pc users ever race on their pc’s? Would I be ‘missing out’ by utilizing them only for training? Or, I suppose I could I replace my campy BB with shimano, attach the pc and then attach the campy chainring to the pc?
You will start to see more people race on the PC’s this year. Some have already done shorter events than IM on them. Most will still race on regular cranks but some will start to do it in IM events this year.
The only issue with your set up is, in the past Shimano Chain rings have not been compatible with Campy 10 speed chains so Campy 10 sp people needed campy chain rings. This may not be an issue now that Shimano has a 10 speed system they may have "narrower’ chain rings. Otherwise, I can put a Campy spider on a Shimano adapter and you can work everything just fine when the time comes.
Frank