Originally Posted by
RoadLight
Big-to-big estimation
But I wanted to be sure so I also used the technique described by HillRider above. I wrapped the uncut chain around the biggest sprocket (28t) on my cassette and my chainring (50t) without using the derailleur. Where they met, I added on inch (two links). This produced the exact same result: 106 links.
But I had a feeling that this might not work. So....
There may be something quite different with SRAM rear derailleurs but I've used the big-big+1" w/o going through the rd sizing technique with literally dozens of Shimano road and MTB rear derailleurs and a couple of Campy rear derailleurs and it always works. I have no problems shifting into the big-big gear combination after the chain is joined and there is no hesitation or interference with the derailleur pulleys. I've used it with cassettes with largest cogs from 24 to 30T so that isn't an issue either.