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Mazda CX-30 2021
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Same issue here since day 1. 2L FWD with O. E. TOYO 18'' tires on. Debbuging, at 1,000 miles 2 tires replaced. Didn't solve. Asked Mazda to perform road force balance. They don't want to. Front passengers side vibrates more than others. Using normal wheel balance, found out that 85 grams weights needed. Seemed to me too much as tire is new. They checked the rim itself without the tire on it, and the rim is not balanced! It showed 70 grams on the outer side and 10 grams on the other. Does it mean the rim is deformed?
This may explain why forum members felt vibration with different tire brands. Maybe there is a factory defect with the rims, or something at the manufacturing floor that makes this defect. Anyhow, the guy crossed the passengers side front right wheel with the left rear one and balanced it rotating the tire against the rim putting 35 and 10 grams instead of the 85 required before. It seems better now, but not perfect. I can feel the vibration specialy when driving a curve - it behaves like a giro ball. I may buy tomorrow the NVH app as JohnG recommended to try and solve this by myself, and would demand Mazda to take it to road force balance.

Yea. My dealer did regular, then road forced, then regular again with Mazda head office tech.
They decided to put Michelin tires on. Fixed 90% of vibration.
I'm happy for now but it's still not a very smooth ride.
 

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I haven't had any vibration issues, thankfully...
I replaced my OE tires & wheels, I was surprised how much balancing weight was on the wheels. My new set has very minimal weights added.
 

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2021 Mazda CX-30 Select AWD
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Same issue here since day 1. 2L FWD with O. E. TOYO 18'' tires on. Debbuging, at 1,000 miles 2 tires replaced. Didn't solve. Asked Mazda to perform road force balance. They don't want to. Front passengers side vibrates more than others. Using normal wheel balance, found out that 85 grams weights needed. Seemed to me too much as tire is new. They checked the rim itself without the tire on it, and the rim is not balanced! It showed 70 grams on the outer side and 10 grams on the other. Does it mean the rim is deformed?
This may explain why forum members felt vibration with different tire brands. Maybe there is a factory defect with the rims, or something at the manufacturing floor that makes this defect. Anyhow, the guy crossed the passengers side front right wheel with the left rear one and balanced it rotating the tire against the rim putting 35 and 10 grams instead of the 85 required before. It seems better now, but not perfect. I can feel the vibration specialy when driving a curve - it behaves like a giro ball. I may buy tomorrow the NVH app as JohnG recommended to try and solve this by myself, and would demand Mazda to take it to road force balance.
I got my dealership to road force balance mine and thought it helped, it didn't fix the issue.
I haven't tried changing tires or wheels. I just wish I knew exactly what the problem was so I can fix it.
 

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2021 Mazda CX-30 Select AWD
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Hi everyone. Does anyone have an idea what it means if my car vibrates less or almost not at all when there is baggage that adds weight to it?
There seems to be a huge difference when the car is loaded and when I am just driving alone with no load at all.
What does this mean in terms of where the vibration could be coming from?
 

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It seems this car is bit jumpy NVH wise. Maybe the mixture of 18'' wheels (who has them) plus planned sportineve shocks and cheap OEM tires.
I had a severe vibration problem.
Bottom line - Took it to a shop that had the Hunter's Elite Toad FRrce Balance machine. They made this machine process, and voila - problem solved.
Just to explain - seems the car stood some time on tires. It made them a bit oval - which led to unbalanced wheels. The machine checks the shape of the tire vs the rim. And gives recommnendations if some tire need to be rotated vs its own rim. After checking this on all 4 tires, the machine recommends which tire to put within which corner of the car. The best balanced wheel (the wheels are balanced with balanced weights) would go to the front drivers side corner. The second balanced to the front passangers corner. The third one to the rear drivers side, and the last one to the rear passangers one. Important to keep manufacturer air pressure.
Car drives like a charm.
 

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‘17 CX-9 Signature & ‘19 Mazda 3 GT
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It seems this car is bit jumpy NVH wise. Maybe the mixture of 18'' wheels (who has them) plus planned sportineve shocks and cheap OEM tires.
I had a severe vibration problem.
Bottom line - Took it to a shop that had the Hunter's Elite Toad FRrce Balance machine. They made this machine process, and voila - problem solved.
Just to explain - seems the car stood some time on tires. It made them a bit oval - which led to unbalanced wheels. The machine checks the shape of the tire vs the rim. And gives recommnendations if some tire need to be rotated vs its own rim. After checking this on all 4 tires, the machine recommends which tire to put within which corner of the car. The best balanced wheel (the wheels are balanced with balanced weights) would go to the front drivers side corner. The second balanced to the front passangers corner. The third one to the rear drivers side, and the last one to the rear passangers one. Important to keep manufacturer air pressure.
Car drives like a charm.
Maybe flat spotted from sitting at dealer’s lot for some time? always recommended to over inflate tires to 40psi when sitting for a while that’s why new vehicles‘ tires when shipped from factories are over inflated to avoid flat spotting…
 

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tekz, I think you have pinpointed the problem! :cool:
Accordingly, my assumption is that many CX-30 cars stated above, with NVH required RFB, is that factory sent them underinflated, for long sitting in transport/dealer's lot. Which led to this problem. My CX-30 version requires 36PSI all corners. Maybe should have overinflated to 50PSI from factory, or maybe theres some leak from the TPMS valves.
I am curious wheather Mazda are reading this forum and may fix this problem.
 

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2021 Mazda CX-30 Select AWD
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Thank you all for posting. I had done the road forces balancing with the dealership in the beginning when this first started and it helped a bit, however it has not eliminated the vibration issues I am experiencing.
Since them the dealership has said all is within spec.
I plan on bringing it to a tire specialist next before going back to the dealership
 

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‘17 CX-9 Signature & ‘19 Mazda 3 GT
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tekz, I think you have pinpointed the problem! :cool:
Accordingly, my assumption is that many CX-30 cars stated above, with NVH required RFB, is that factory sent them underinflated, for long sitting in transport/dealer's lot. Which led to this problem. My CX-30 version requires 36PSI all corners. Maybe should have overinflated to 50PSI from factory, or maybe theres some leak from the TPMS valves.
I am curious wheather Mazda are reading this forum and may fix this problem.
Highly unlikely tires weren’t over inflated from factory during shipment…soon as dealers receive the cars, they perform the PDI (pre delivery inspection) and inflate them to the recommended spec. What these dealers don’t realize is that they don’t know when they’ll sell off the cars therefore causing flat spotting when cars aren’t driven/test driven regularly.
 

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2021 Mazda CX-30 Select AWD
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So I spoke to my local mechanic to get a second opinion on this.
I told him, this is a brand new Mazda CX-30, with 4500 miles on it, it has vibrations at 25-35 ; 45-55 ; 65-75 ,etc mph. As soon as he heard that, he got real uncomfortable, tense and said "this is a transmission issue."

The guy has been doing this for around 30 years, he didn't even look at my car and already knew something wasn't right.
He said that a lot of the time the only fix on new, modern cars that have these kinds of vibrations so early on is an update of the computer.

Now that brings me to my second point. I have been posting on this forum about having issues with my transmission too. It jerks, it has grinding acceleration at certain gears and RPM, and I can feel a kick from under the floor right where the transmission is located when driving down the road especially at faster speeds, so it gets worse when going faster.

So for those of you whom are still having vibration issues but not at the expense of the tires or wheels, then look into this. We all know that there are tons of people who have have issues with the transmission and lots who have had it corrected by a computer update.

My mechanic was so thrown off by this, he said if Mazda can't fix it what am I going to do with it to help you out? He said i can look at it but I probably won't be able to help you out.

Now I will be bringing my car into another dealership for another opinion before I bring it back to the one I was originally going to.
 

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I had vibrations due to automatic cylinder deactivation wich got worse after the fix, change of brackets and an pcm update.
The car was more shaking after the fix, I bought a lemon , the car dealership did not do their job right when it comes to give proper information to Mazda general agent in Sweden according to a friend who works for another Mazda car dealer….. I wish I took the lemon to another car dealer for a second opinion.
 

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2021 Mazda CX-30 Select AWD
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I had vibrations due to automatic cylinder deactivation wich got worse after the fix, change of brackets and an pcm update.
The car was more shaking after the fix, I bought a lemon , the car dealership did not do their job right when it comes to give proper information to Mazda general agent in Sweden according to a friend who works for another Mazda car dealer….. I wish I took the lemon to another car dealer for a second opinion.
Did you get rid of your car or do you still have it?
 

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Sorry to hear about the lemon! I hope you find something that you can be happy with!
 
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