The G01 X3 M40i and G02 X4 M40i are the performance variants of BMW's sport-utility twins, and they respond well to targeted suspension calibration. Dinan's Performance Spring Set drops both 7/8" (22mm) front and rear with a 25% increase in spring stiffness, tightening geometry and cutting the body roll that works against these platforms at pace.
The spring design is differentiated front-to-rear: linear-rate fronts for consistent, precise feel at turn-in; dual-rate rears to handle the varying load demands of an xDrive SUV. All springs are CNC wound from high-tensile chrome silicon wire, shot-peened for stress relief, and preset to hold rate without sagging.
Dinan G01/G02 X3/X4 M40i Performance Spring Set Features:
+ Lowers the vehicle 7/8" (22mm) front and rear
+ 25% increase in spring stiffness front and rear
+ Front linear-rate springs, rear dual-rate springs
+ CNC wound high-tensile chrome silicon wire, shot-peened for stress relief
+ Preset to prevent spring sag
+ Substantial reduction in body roll
Pair with the Dinan Ride Quality & Handling Kit to maintain suspension travel at the lowered ride height.
