Originally Posted by
Crankycrank
Here's a chart listing most derailleurs with their pull ratios and other useful data. Looks like only some older SRAM models share the same 1.3 ratio of your X9. Didn't see any Shimano RD's with that.
Bicycle Cassettes & Drivetrains - Google Sheets
I think you are misreading the chart. The 10 speed X9 has a 1.3 pull ratio. The 9 speed X9 has a 1.1 pull ratio.
For ChinookTx: You can try to find a Shimano and experiment…no problem with that but be prepared for possible failure…or you can buy
A SRAM X5 new for $40 US. Or you can go the used route. I have several X9s squirreled away and might be willing to part with one. PM me.