Shimano FC-RS500 11 speed chainset with 10 speed cassette and chain Is it possible to use a Shimano 11 speed crankset FC-RS500 with a 10 speed ultegra cassette and chain. I will be using 105 5700 front deraileur and a 105 5701 rear. Thanks
If you are using shifters that match the derailleurs (i.e 105 5700 series), then yes this will work.

11 speed cranks have a slightly closer chainring spacing than 10 speed to accommodate the narrower chain. Consensus on this site is that you can go one speed difference on the crank and get working front shifting.

I like to point out that the non-series RS500 cranks are somewhat heavier than 105 5700 and I would not call them a great match, but if you are looking for a way to get an affordable compact 110mm BCD crank to work with the rest of the drivetrain it will provide a workable solution.