The Eibach Pro-Spacer S90-2-15-017 is a bolt-on, hub-centric wheel spacer kit (System 2) sold as a pair, with 15 mm of track widening per side. The manufacturer describes the Pro-Spacer as a high-tensile aluminum alloy part, with exact-fit tolerances for wheel balance, durability and fatigue testing on every application, and a special corrosion-resistant coating. Compared with steel spacers, the aluminum build cuts unsprung weight, and the tighter tolerances help keep the wheel balanced at highway speed. Track-width spacers like this can also improve stance and tire clearance for owners running wider wheels on an S5, Q5 or A4 chassis. Search terms buyers use for this part include "15mm hubcentric spacer Audi A4 5x112," "Eibach System 2 spacer S5 install," and "Audi Q5 15mm wheel spacer 66.5 hub."
This kit is listed for the 2008-2011 Audi S5, 2009 Audi Q5 and 2009-2011 Audi A4. Confirm your exact model year, trim and wheel offset against the manufacturer's fitment data before ordering. Because this is a through-system spacer, the manufacturer states that longer wheel bolts are required and that the kit ships without them. Owners on user forums note that 15 mm spacers need wheel pockets at least about 12 mm deep, or the studs will protrude past the wheel face. Check the depth of your wheel pockets before you buy, especially with aftermarket flat-back wheels.
No. The manufacturer states that System 2 spacers are delivered without fastening parts. You need to order longer Eibach wheel bolts, with a shaft longer than the original bolts by the spacer thickness, and a collar shape that matches your wheels.
Owners on user forums report that wheel pockets should be at least about 12 mm deep for 15 mm spacers. If the pockets are shallower, the usual fixes are trimming the studs or drilling deeper pockets. Check the wheel pocket depth before ordering.
The manufacturer's System 2 instructions say installation should be done by trained technicians in a properly equipped workshop, so treat this as an advanced DIY job. Clean the hub face and the back of the wheel to bare metal, check the centering fit before you tighten anything, and use a torque wrench for final tightening. The manufacturer directs you to the workshop manual or the wheel maker's specification for torque values. Recheck all torque after the first short drive, roughly 50 km (about 30 miles), as the manufacturer recommends. Owners on user forums often apply a light coat of anti-seize or copper grease to the hub and the spacer contact surfaces to make later removal easier.
