> Wayne Stetina, Shimano's R&D manager, says, "If you remove the chain when it is only halfway worn
> out and flip it over," he says, "you will double your chain life." In other words, your chain will
> now be turned inside out. The other side of the rollers will now contact the gears, and the
> derailleurs will now be laterally bending the chain the opposite direction. Stetina says that
> Shimano engineers discovered this phenomenon quite by accident.
I don't understand this. We've long-ago determined that chains don't stretch as in the metal
elongating; rather, the internal parts of the chain wear, producing slack that elongates the chain
as a whole. What is it about this wear that would be changed by flipping the chain?
At its simplest, a chain displays its wear when you lay it out on a table and measure its length.
Obviously, it doesn't matter which side you lay it on, the length is the same. So if flipping a
chain over improves chain life, there's an implication that an elongated chain is not the only thing
affecting performance.
There's also a logical problem in Wayne's statement, since flipping a chain over, half-way through
its wear cycle, should at best allow it to go 1.5 times normal life (since in its flipped-over
state, you can't do better than it would starting from new, unless flipping it somehow rejuvenates
it into something better than new!).
--Mike-- Chain Reaction Bicycles www.ChainReaction.com
"Wayne Pein" <
[email protected]> wrote in message
news:[email protected]...
> from velonews.com
>
> Wayne Stetina, Shimano's R&D manager, says, "If you remove the chain when it is only halfway worn
> out and flip it over," he says, "you will double your chain life." In other words, your chain will
> now be turned inside out. The other side of the rollers will now contact the gears, and the
> derailleurs will now be laterally bending the chain the opposite direction. Stetina says that
> Shimano engineers discovered this phenomenon quite by accident.
>
> Any credence to this crud?
>
> Wayne