9515g has 19mm using the coil height/gap height/2*15% METHOD... putting it on a dumax machine is the best possible way to really know.. xsus may be 16mm, there for xmax would then only be 16mm..
i can vouch they do have a ton of xmag though..the 9500 is around 36mm each way... the suspensions get better everytime they upgrade..i would be willing to bet its in the 18-22mm range,which btw in there recommed enclosure it will take 3k t surpass that above tuning..