Actually SRAM 9-Spd is close enough cable ratio to drive a Shimano 10/11-sos derailleur over nine gears. ShRAMano both have no forward compatibility from their 9-Speed setups.
I haven’t been able to confirm that BOX-9 matches SRAM-9. It does not match Shimano-9 (plugged in a shifter I had to see).
Oct. 25, 2019, 8:14 a.m. - Andrew Major
Actually SRAM 9-Spd is close enough cable ratio to drive a Shimano 10/11-sos derailleur over nine gears. ShRAMano both have no forward compatibility from their 9-Speed setups. I haven’t been able to confirm that BOX-9 matches SRAM-9. It does not match Shimano-9 (plugged in a shifter I had to see).