The IDS dropouts are compatible on the Gambler, Voltage, Voltage fr and Ransom. The +10mm dropouts work and I haven't tried the -10mm ones on a Ransom. I think they will work but tire clearance will be tight. I have some short dropouts on my Voltage and that gives a 375mm chainstay length with gears and a chain guide. It is pretty fun set up like that.
