Works for me! Dropped 15 seconds to a 17:23 in a little local race yesterday. In perfect weather and on a flat course (in the thin air of 3,000 feet 
This after lots of riding miles (175 miles last week - a lot for me) and less running than usual (20 mpw) since March … and very little speed work either. Last PR was a 17:40 two years ago while I was putting in 45 mile weeks with intervals, tempo runs, etc. Interesting. -TB
See–that running stuff is no good for you!
You must have been riding PC’s. 
PCs? Do 5-year-old Shimano 105 cranks count?