
Originally Posted by
kawabanga
Consider that if a rim with a different offset is mounted, you could have the same problem: standard rims are ET46, Detroit rims are ET35, more than 10mm...
The change in offset is not the issue - it's about structural integrity. The extra metal that reduces a wheel's offset is part of the wheel while a spacer is not.
A good spacer is machined from solid aluminium billett alloy that is at least as solid as the wheel so it will not crush and is perfectly safe (as long as it either allows the wheel to still mount on the hub or it sits on the hub and extends so the wheel can mount on it). A crappy spacer is made of porous cast aluminium or plain non-alloyed aluminum so it crushes under side loadings (cornering) which reduces the tension on the wheel nuts/bolts allowing them to loosen. Worst are the non-hubcentric porous ones which crush more quickly
Since spacers are not easily inspected and could potentially be made from cutouts from sheet bought at Bunnings, only ones supplied by the manufacturer as OE fitment are legal as they are certified along with the rest of the car.
Resident grumpy old fart
VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS
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