The best case scenario of ceramic bearings in a wheelset is 1 watt at 30 miles and hour. We sell ceramic bearings and they’re $1000, but we’re honest: “guys, it’s 1000 bucks for a watt”. Tony Martin, at the worlds, rides thousand dollar ceramic bearings. For the consumer, you can buy a better tyre and you’ll save twice that. You put latex tubes in there you’ll save 6 times that amount. A new chain on your bike can be as much as 6 watts compared to a worn chain. Just cleaning your drive chain is a couple of watts. 1 watt of ceramic bearings is about 3 seconds per 40 kilometres. I can find you a minute for the 40k for very little money.
[It would be nice if more people in the industry were this honest about where the gains can be found.. great article!]