031946A: Front lower arm bush - eccentric 66mm SPORT

The eccentric 66 mm front lower arm bush — the one that gives you steering you can actually aim.

Because the bore sits off the axis, turning the bush moves the arm and hands you caster and camber that a standard bush cannot. On a lowered car that is how you get the front geometry back into a usable window.

90 ShA polyurethane — the yellow SPORT compound. StrongFlex build this grade for tuned and lowered cars: the suspension gets noticeably stiffer, the geometry stops moving under load and the car holds its line when you push it. The rigid build is what makes the steering so precise: there is nothing soft between the arm and the subframe, so the front end goes exactly where you point it.

Every StrongFlex product ships with the correct grease for fitting.

• 1x 031946A Front lower arm bush – eccentric 66 mm SPORT

Fits BMW 3 Series E46 (98–07) — RWD and Compact — plus Z4 E85 / E86 (02–08) and the Z4 M 3.2 (06–08).
Replaces BMW part 31 10 7 838 575. A car takes two — one each side.

This is StrongFlex's motorsport-grade front bush: drifting, time attack, track and rally. The payoff is steering precision; the trade is that a solid bush passes road vibration into the shell rather than soaking it up, so it feels harder than the rubber it replaces.