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Discussion Starter · #1 ·
on the current IS "F" Bridgestone Potenza RE050A. I noticed the side wall sticks out, the rubber part act as a guard against curbage. I also notice the higher end Porsche 911 has it too. Is that a style, because some RE050A does not have that. Can someone explain this.

Two very different sidewall.

255/35/19R 96Y RE050A

255/35/19ZR 96Y RE050A

Both have same heat and wear ratings.
They both look identical but without the side wall protector against curbage.
 

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Tire manufacturers set different specifications for each tire size and model usually dictated by the car manufacturer itself.

In most cases, the difference in sidewall design and shape is based on the width of the tire. If you were to upsize to a 265 or 275, the tire will sit alot more square on the rim than a 255 would.
 

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right, or "rim saver" meant to protect a very light brush up against a curb or whatever. it's just extra rubber in that area, some have, some don't.
 

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I would be interested to know what tires people are seeing most often on these vehicles. We have had two arrive here. One Nieman Marcus Edition and one Standard build. The Nieman had Bridgestones and the Standard Build had the Michelins.
 
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