Originally Posted by
GhostRider62
…and the flat top chain is very inefficient.
If you’re referring to CeramicSpeed’s efficiency testing, I don’t think there’s enough substance there to warrant the clam that flattops are “very inefficient.” First, after giving the chains their super race lube treatment and running them 13hrs at 90rpm x 250w, Dura Ace and Force AXS chains are only .62w apart. When you consider that against the fact CeramicSpeed say that with factory lube most chains run 8w-10w compared to the 4.5w and 6.5w we see for these two chains, respectively, it’s not only a quite small difference between treated results compared to factory lube results, but it clearly indicates that the type of lubrication is far and away the biggest factor in efficiency. Layer in durability, and efficiency is even harder to assess since chain wear makes staying on top of state-of-lube hypercritical.
https://cyclingtips.com/2019/12/the-...ciency-tested/