Scion FR-S, Subaru Series.Blue

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Sep 17, 2014 | 06:08 AM

#31

JonBoy

Joined: May 2002

Posts: 19,734

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Quote:

Originally Posted by berny2435

in the world of manufacturing, if the part weighs less, it can cost less when it comes to steel. 5x100 vs 5x114.3 might take less material. Being that it doesn't really need to handle as much abuse through the powertrain and brakes, it can have less material. Subaru has to have something up their sleeve besides trying not to upset STi owners.

I'm not sure how much strength simply moving the bolt pattern outward really gives you if you kept the mounting face as a constant variable.

I'm sure many FRS and BRZ owners are happy that they went with the 5x114.3 over 5x100.

Shear resistance of 5x114.3 vs 5x100 is the ratio of the diameters of the bolt pattern. In other words, the 114.3 is 14.3% better at shear resistance than a 100. However, assuming equal size studs/threads, they would have equal clamping force on the wheel/hub, which is really where the strength is found. The only time your bolts/lugs are in full/direct shear is when they aren't fully tightened - otherwise, the main loading on them is distributed throughout the entire bolted joint rather than just the bolts themselves.