"...the bolt pattern is slightly different, 114.3mm on the M to 115mm I believe on the new 300. While this ain't much, we have had much debate, especially on what that could mean in the long term. You are putting more strain on the studs and lug nuts as they wont be seating 100% flush with where they are supposed to, and you may also be asking for added vibration on things like the wheel bearings."

Although many owners are running the 5x114.3mm bolt pattern on their new '300 series' models without a problem, it also appears that many still continue to experience problems as well.

I just bought my new rims and Discount Tire wouldn't mount the 114.3'* because they are not the correct bolt pattern for the car. They have many cars that come in with some shudder and broken lugs so they made it company policy not to install anything other than what the car bolt pattern calls for. I sent the original ones back and got 115'*. Personally, for what I paid for the car, I would wait it out and get what comes on the car.

I have 5x114.3. One tire place would not even so much as balance my tires due to the fact they did not want to be held liable for any problems coming from the wrong bolt patter, and even went to the trouble of printing up and copying a letter stating that I would not sue them if something happened to me while driving on them.

On the other hand I have gone to 2 other HIGHLY recomended wheels shope Wheelspecialists and Total Auto Pros in Tempe and Phoenix, they both said no problem we do it all the time without issue...

There is a shake that will not go away, even with the newly installed hubcentric rings from 65-75 mph.

I am getting refunded this week, for the DUB Moab wheels I bought a while ago, and I am hoping to find wheels in the 115x5 but the ones I really want are the Zenetti Heir, they are even pictured in Zenetti'* catalog (not online) but the only bolt pattern they make that wheel is 114.3x5. Wonder why that company would go build a wheel and put it on their catalog with an incorrect bolt pattern?

My 4 decades of performance driving lead me to disagree with your claim. The center hub was never engineered to center the wheels. A slight error of even a millimeter there multiplies as it moves out from the hub. The lugs are designed to center the wheel and hold it firmly in position. The wheel must line up perfectly on the lugs. 114.3 mm wheels do not line up on 115 mm lugs.

Hub centering rings are not the right way to solve the problem. Once vibration starts, it almost always gets worse.

Many years ago, I felt the right front wheel and tire vibrate violently then roll down the road ahead of my car as I rapidly descended a hill on a busy 2 lane black top. Soon the right front of my vehicle dipped, throwing my car into the path of a large Semi 18 wheeler. By the grace of God, I hit the opposite shoulder and eased into a ditch - a fraction of a second before the truck barrelled by.

Why did the wheel come off? I had oversized the wheels with mismatched rims and one wheel vibrated loose. No part of the car takes more stress than where the wheels are bolted to the lugs.

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The difference between 115mm (factory) and 114.3mm is 0.028".
In machinery, that is a huge difference. On the wheels on my car that would be totally unacceptable. Even with hub-centric wheels, I would be concerned with vibration, and if bolt circles don't match the lug nuts won't seat evenly. This could cause galling between the nut and wheel or possible loosening during driving.
This may be a slightly paranoid viewpoint from someone who had wheels come off his car because of (now discontinued) universal-mount wheels.
More than once. Actually, they never came all the way off, I was able to stop quickly enough when they began to vibrate. The lug nuts would slowly work loose during driving.
I also had major problems with some Breyton wheels Discount Tires mounted on my BMW without installing the hub-centric spacer rings. Although the lug nuts were tapered and should have centered the wheels, vibration was terrible no matter how they installed them.
I will never again install wheels on a car that aren't specifically designed to fit THAT car.
I used to care a lot more about getting the best deal. Now I care most about getting the best equipment.
I wonder if anyone else out there watching have had similar problems with non-specific wheels?