Originally Posted by
svtmike
Yes, you can use the 7900 cables with 7800. You'll have a couple of leftover ferrules. I don't believe anything else is different.
I don't know what grease you're referring to.
The 7900 shift cable set features all stainless steel cables and enough Shimano grease impregnated housing to re-cable your derailleurs.
The 7900 housing package includes the aluminum ferrules required for the Shimano 7900 shift levers. Everything you need to keep your 7900 derailleurs shifting silky smooth.