There are two versions of the Regulator, the SX for riders looking for a lightweight ebike that rides as close to a mountain bike as possible, and the CX for riders who need as much power and range as possible.
Geometry for both bikes is the same, and the SX also has a flip chip to change to a lower/slacker setting. With mixed wheels and 160/150mm travel, Transition have designed the Regulator to be fun on more mellow trails as well as techier trails.
Both ebikes are available in two similar specifications, with Deore or XT drivetrains and tweaks to suit the intended use of these ebikes.
Regulator CX: Bosch CX motor (85nm), 600wh battery, optional 250Wh range extender. 
Regulator SX: Bosch SX motor (55nm), 400wh battery

Transition Regulator Geometry & Sizing

Transition Regulator SX Geometry
High/Low
Sizes in mm S M L XL
A: Stack 623 632 641 651
B: Reach 425 455 480 510
C: Head Tube
Angle
64.5°
D: Head Tube
Length
105 115 125 135
E: Effective
Seat Tube Angle
78.8° 78.5° 78.2° 77.9°
F: Seat Tube
Length
375 400 440 470
G: Effective
Top Tube
551 583 610 643
H: BB Height 350
I: BB Drop 25
J: Chainstay Length 442 442 448 448
K: Wheelbase 1201 1235 1271 1305
L: Standover
M: Fork Offset 44
Seatpost Diameter 31.6
Transition Size Guide