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Discussion Starter · #1 ·
@ 95-105 KM/H I feel vibration at pedals and see the passenger seat shaking.

Anybody else?

Will visit dealer thursday for balance all wheels.
 

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Cant speak for vibration in the pedals, but it is not uncommon at all for the passenger seat to shake a bit when unoccupied, Ive noticed that in many cars Ive owned (Honda, Subaru, Nissan).
 

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Discussion Starter · #3 ·
Dealer did a new balance, didn't checked and only add mass to the wheels......
Will visit a specialist wheel shop for proper check the wheels and how they fit.
With one wheel is have one side 25 gram and outerside 75 gram, way to much I think.
 

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Wow, that does look like a lot. Hit any potholes? Bent wheel maybe? What tires do the cars with the bigger 18" wheels get? US AWD Touring models with 16" wheels like mine get the Yokohama AVID S34FV. I've had good luck with the Yokohama Geolanders that came on my wife's old Subaru Forester and also on her new 2016 CX-5. Some other brands like Goodyear and Bridgestone I've have problems with them going out of balance as they wear. I've heard of similar issues with Continental tires, as well.

I assume air pressure is good, or you would have gotten a TPMS fault, unless the TPMS sensor isn't working correctly.
 

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Discussion Starter · #5 ·
Pressure is oke, CX-3 does not have special sensors.
Did not hit anything, only 2000 km now.
Problem was from the start, but they said wheels should set within a few hundred km.
 

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I have also had problems with vibrations from the wheels (215/50 x R18), my dealer "balanced" my wheels and just added more sticky weights to the rims.
So I went instead to a specialist who dismantled all four tires, gauged the rim and then remounted all the tires again because the machine could "remember" The data of the rim it self. It was much better and one of the rims was "relieved" of 45 grams!.
It's worth going to a specialist because the car is very sensitive to even the smallest imbalance.
 

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Although I now have a specialist to balance my wheels (215 x50 R18 Toyo R40), I am still not satisfied, they still shaking in the range of about 120- 180 km per hour.
Toyo tires have good comfort aso, but they are not especially "round".
I can see that now Michelin has produced a tire in the right size, Michelin Primacy 3. They usually make good "round" tires, so it will be the next project.
 

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Although I now have a specialist to balance my wheels (215 x50 R18 Toyo R40), I am still not satisfied, they still shaking in the range of about 120- 180 km per hour.
Toyo tires have good comfort aso, but they are not especially "round".
I can see that now Michelin has produced a tire in the right size, Michelin Primacy 3. They usually make good "round" tires, so it will be the next project.
I haven't been able to find a tire in 215/50R18 here at all, so I just purchased Continental TrueContact in 225/50R18 and have scheduled to install them on Thursday. These tires are rated some of the best, better than the Michelin, in terms of comfort and performance. And I'm hoping the slight increase in size helps with the ride comfort even more. The stock tires are garbage.
 

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Although I now have a specialist to balance my wheels (215 x50 R18 Toyo R40), I am still not satisfied, they still shaking in the range of about 120- 180 km per hour.
Toyo tires have good comfort aso, but they are not especially "round".
I can see that now Michelin has produced a tire in the right size, Michelin Primacy 3. They usually make good "round" tires, so it will be the next project.
Toyo 215/50 tyres on my car's 18" rims. Thankfully no sign of wheel inbalance.
 

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Today I fitted new tires on our car. The tires are Michelin Primacy 215 50 R18 92W. What a difference !! it's like night and day! quieter and soft comfortable ride, no vibrations which we had struggled so much with the original tires ... just happy!
 

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Today I fitted new tires on our car. The tires are Michelin Primacy 215 50 R18 92W. What a difference !! it's like night and day! quieter and soft comfortable ride, no vibrations which we had struggled so much with the original tires ... just happy!
I know how you feel haha. I put in new tires too but I had to go a size bigger (225/50R18) because no one makes 215 for some reason here. It's a such a big improvement over the terrible stock tires.
 

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I've got a buddy with tire mounting and balancing equipment and he's shown me the basics of how to use it (he got tired of mounting race tires for me so he just lets me use his equipment).

With the proper equipment, it's not hard to tell if the wheel or tire is out-of-round. If you follow the workflow in the software, it will tell you more than you ever thought you wanted to know about your wheels and tires. It's not hard to balance a tire that isn't round but it will still cause vibrations.

The new-ish road-force balancing equipment will walk you through every step of testing run-out of the wheel and tire and it will tell you if there is a problem. Hunter have spent tons of money making this incredibly easy. If a tire installer can't get rid of the vibration or can't tell you why it's impossible, find another installer.
 
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For 18" wheels, 225/50-18 and 235/45-18 are also usable sizes.
 
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The 225/50-R18 is a perfectly fine alternative and in my opinion looks even better than the 215 on the car. It's most likely a lot cheaper too since it's a more popular size than the 215.
 

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The 225/50-R18 is a perfectly fine alternative and in my opinion looks even better than the 215 on the car. It's most likely a lot cheaper too since it's a more popular size than the 215.
Hmm.. If you put 225 50 R18 on instead of the recommended 215 there are some small things which, despite everything changes. The circumference is greater, corresponding to a higher leverage, corresponding declination in the speedometer (standard rolling circumference is 789 RPM, 225 50 is 798 RPM, ie 1.49% larger circumference), higher tires are becoming more comfortable but also more wobly sideways.
All in all, it makes slower acceleration and more wheel noise (wider footprint).
Small details but everything counts especially when you dont have several hundred BHP to do good with ;-)

I chose to put Michelin 215 50 R18, hence the standard size. They are also labeled AO, which means that they are standard approved for Audi cars and comes as a factory-installed tires on some Audi models (at least here in Europe)
 

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The only difference is a small change in speedometer (70 miles per hour becomes 71). Any change in acceleration will be negligible. There's no noise, the stock tires were noisy as hell, my new tires are very quiet. Generally it's tread pattern and make up of the tire that make noise, not size.
 

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The only difference is a small change in speedometer (70 miles per hour becomes 71). Any change in acceleration will be negligible. There's no noise, the stock tires were noisy as hell, my new tires are very quiet. Generally it's tread pattern and make up of the tire that make noise, not size.
I only emphasizes the facts, the rest is just a matter of style and emotion ;)
 

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215/50/18 is very limited in availability in the US and they are expensive. Michelin doesn't even sell that size in the US and I'd never bother with shipping them in from an overseas distributor. Going with 225/50 opens up an abundance of options at lower prices and is so close to stock that its fine.
 
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