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Originally posted by Hugo Stiglitz View PostHe's absolutely right. The clamping force of the lug hardware holding the wheel face to the hub is all that's needed to keep the wheels centered. I had my Apexs mounted to the rear hubs with 10mm spacers that left no measurable length of the centerbore going into the wheel hub, and my wheels were perfectly centered. Not a single vibration or anything, tested up to 90 mph. Same with my current wheels.
You will get people trying to tell you that the hubcentric rings are intended to take the load off of the lug hardware and onto the hub center. If this were true, hubcentric rings made of plastic would be less than useless. The entire weight of your car is NOT resting on the lug hardware. Their intention is to fill in the extra space around the hub and the centerbore to ensure that when you bolt up your wheels, they are in the perfect position.
Hubcentric Fitments All BMWs use hubcentric wheels. When mounted to the car, the wheel rests on a lip instead of the wheel bolts or studs. The lip contributes to the strength of the wheel and the wheel cannot safely be used without a lip. The wheel bolts are not strong enough to support the weight and loads generated through the wheel. The lip is usually 9-10.5mm in depth and the new spacer must have its own lip. Turner and H&R Spacers with their own integrated hubcentric lip are: 10mm, 12mm, 12.5mm, 15mm, 18mm, 20mm, 25mm, and 30mm.
Are you saying that TMS is wrong?1988 325i 4dr/5sp Lachssilber Metallic/Black Leather
2003 540iT M Sport, Black Sapphire/Black
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You know how plastic hub centering rings are really fragile? It's because the material is very stiff and doesn't deal with bending very well. it does, however, deal with pressure very well as it is completely incompressible, which is why it is used for hub rings.
Vibration is not what hub rings are aiming to solve. Bolts/studs have not changed since the 70s, but cars have gotten substantially heavier. It's a reinforcement.
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