zac said:According to the updated interoperability chart, and the Shimano rep I spoke to the other day the 7900 chain will work just fine with 7800 rings and everything from 105 to 7900 cassettes.
As to the SRAM cassette? Sorry don't know didn't ask.
Scroll down to the 'Compatibility:rear drive-road' section of that PDF chart and you will see that it lists the 7900 chain as compatible with all of the current 10-speed cassettes.frdfandc said:Here is the compatibility chart I'm looking at right off of Shimano's website.
http://bike.shimano.com/publish/con...e.html/01) Drivetrain Compatability Chart.pdf
Reason asking is warranty rep at Shimano told me last Thursday that the 7900 chain will not work with 7800 stuff
thanks!-dustin said:you sound like a mechanic...
a real mechanic...not a home hack.