These breakage events are as unique as a snowflake, and fleeting in the sense that by the time we hear the impact, the particle has ricocheted off into the distance and we almost never see the origins of said particle. So retrieving the projectile to weigh, study, and recreate the incident is a pseudo-academic pipe dream.
However, we’re all subject to the same aggregated risk, weighted only by the amount of miles we drive. Mentioned earlier in this thread, the notion that all glass is the same - on the merit that all auto glass must meet the same certifications - is a complete farce.
The acoustic, climate, solar glass in a Mercedes or Range Rover will NOT react the same to impact as a windshield built only to satisfy spec. You will find less irregularity in the luxury windshield, less internal stresses, and it won’t be “ready to pop” on impact, like a kid on the verge of a temper tantrum.
Here’s a little test everyone here can do. Stand outside your vehicle, and look through a driver or passenger front window out through your windshield. You should see no ripples or distortions. Cheaper windshields may look fine perfectly perpendicular to the glass, as a seated driver, but the consistency (quality) becomes more apparent at more acute angles.
The proposition is the same as comparing Oakley lenses (fine optics meeting Z87 standard and providing UVA/UVB protection) to a $20 pair of safety glasses from Grainger. Both meet protection standards but one is far superior in quantifiable ways. The cheaper ones may have so much edge distortion that they make you feel like you’re walking 6-12” below grade.
It is very possible that someone moving out of a $6000, depreciated luxury car with no breakages in 10 years is surprised that they got several rock chips in the first year in their 4Runner. It may also be roof height and windshield angle. Wranglers suffer the same issues and their glass is tall and flat, as well.
I’d like to get some data points from G wagon drivers and see if they experience a higher rate of chips, on the basis of windshield height+angle, or if the premium glass reduces that.
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