Falk (Rexnord) 6761482 10290646 2090FZ2A-1.504 400T ULTRAMAX The Falk Ultramax size 2090 gear drive delivers has ratio range of 1.5 - 985.3 and a torque range of 32,400 - 151,000. The Ultramax product line is only available for use with a horizontal low speed shaft in foot mounted applications, and also features many standard motor mounting options such as top motor mounts, scoop mounts, and flanged motor mounts.