Flat spot when tire cools down

[sfu88]

I have posted this question to this forum before. The feedbacks I got seemed to point to flat spotting of the Dunlop tires we got. Since then the service manager swapped another set of 4 tires for me to see if the same symptom persists. The same vibrations occur at around 25mph and 75mph for the first 5 miles or so. So the problem at least is not specific to my set of tires.

The service manager also suggested overnight flatspotting could be the culprit. However, he also wondered if this is a general Dunlop issue why I would be the only Genesis owner who voiced this issue to him so far.

I wondered if there any way I can confirm if it is in fact overnight flat spotting? If flatspot is not the problem, what would be the next thing to look into?

If this is a Dunlop issue why wouldn't we hear more about this except a few owners from this forum? I am just naturally nervous something else might be wrong with my Genesis. Everything else seemed to be perfect so far!

Your help is appreciated!




My post from before:

******************************************

My Genesis (Cdn) was manufactured on May9, 2009. I personally didn't find the ride unacceptable. Not sure anything was changed since it was launched.

However, I do have a slight problem with my ride. At the start of the day when driving at round 40km/h I can feel and hear some funny waddling at the rear wheels for a few seconds. However the waddle goes away as the tires warm up. I called my service manager he said to wait until the car breaks in at 1000Km to see if the problem persists. I am going to see how this works out after 1000Km. The symtom is almost exactly like flat spotting tires but it is impossible for my genie because it was so recently manufactured and I am pretty much driving it every day. Not sure what is causing it.

 

[ctrcbob]

I have posted this question to this forum before. The feedbacks I got seemed to point to flat spotting of the Dunlop tires we got. Since then the service manager swapped another set of 4 tires for me to see if the same symptom persists. The same vibrations occur at around 25mph and 75mph for the first 5 miles or so. So the problem at least is not specific to my set of tires.

The service manager also suggested overnight flatspotting could be the culprit. However, he also wondered if this is a general Dunlop issue why I would be the only Genesis owner who voiced this issue to him so far.

I wondered if there any way I can confirm if it is in fact overnight flat spotting? If flatspot is not the problem, what would be the next thing to look into?

If this is a Dunlop issue why wouldn't we hear more about this except a few owners from this forum? I am just naturally nervous something else might be wrong with my Genesis. Everything else seemed to be perfect so far!

Your help is appreciated!




My post from before:

******************************************

My Genesis (Cdn) was manufactured on May9, 2009. I personally didn't find the ride unacceptable. Not sure anything was changed since it was launched.

However, I do have a slight problem with my ride. At the start of the day when driving at round 40km/h I can feel and hear some funny waddling at the rear wheels for a few seconds. However the waddle goes away as the tires warm up. I called my service manager he said to wait until the car breaks in at 1000Km to see if the problem persists. I am going to see how this works out after 1000Km. The symtom is almost exactly like flat spotting tires but it is impossible for my genie because it was so recently manufactured and I am pretty much driving it every day. Not sure what is causing it.

Have not heard of anyone else having flat spot problems with the Dunlop SP Sport 5000m tires. Seeing as how you have swapped tires and the swapped tires also do this, the problem is most likely elsewhere in the car. (example, it could be an out of balance driveshaft, or any of many other things).

Lastly, although it probably is not the tires, due to you swapping them out, one thing you may want to try. Get a "Road Force Balance". (Look it up in Google). (Also look up "Hunter GSP 9700" as that is the machine that does the road force balance and correction). I had it done on my Continental and it worked wonders with the vibration I had at 55-60mph. Fixed it.

 

[sfu88]

Thanks Bob. My dealer does use Hunter Road force balancer so I doubted I can get more improvement from rebalancing the tires. The technician told me they spent 30K on the machine alone.

Do you think the driveshaft balance is temperature sensitive? I am not a mechanics and I am trying to isolate to the potential components that is temperature sensitive that would throw my wheel "out of balance".

 

[wallymn]

I have it, and it has been discussed in other posts on the site.

Leave the car sit overnight, and the first 2 miles of driving in the morning there is a VERY slight vibration until the tires warm up.

I don't have this problem with the snow tires, only the dunlops.

 

[GripperDon]

I have it, and it has been discussed in other posts on the site.

Leave the car sit overnight, and the first 2 miles of driving in the morning there is a VERY slight vibration until the tires warm up.

I don't have this problem with the snow tires, only the dunlops.

I had same thing. Two things came to mind:

1. It completely disappeared when I got rid of the Dunlops and put on the Goodyear Assurance Comfortreads.

2. I think the stiff ride accentuates sensing the problem.

 

[ctrcbob]

Have not heard of anyone else having flat spot problems with the Dunlop SP Sport 5000m tires. Seeing as how you have swapped tires and the swapped tires also do this, the problem is most likely elsewhere in the car. (example, it could be an out of balance driveshaft, or any of many other things).

Lastly, although it probably is not the tires, due to you swapping them out, one thing you may want to try. Get a "Road Force Balance". (Look it up in Google). (Also look up "Hunter GSP 9700" as that is the machine that does the road force balance and correction). I had it done on my Continental and it worked wonders with the vibration I had at 55-60mph. Fixed it.

I mentioned Drive Shaft only as an example. If it were the Drive Shaft, it would be out of balance all the time, not just when cold. Sorry.

 

[ImInPA]

I have posted this question to this forum before. The feedbacks I got seemed to point to flat spotting of the Dunlop tires we got. Since then the service manager swapped another set of 4 tires for me to see if the same symptom persists. The same vibrations occur at around 25mph and 75mph for the first 5 miles or so. So the problem at least is not specific to my set of tires.

The service manager also suggested overnight flatspotting could be the culprit. However, he also wondered if this is a general Dunlop issue why I would be the only Genesis owner who voiced this issue to him so far.

I wondered if there any way I can confirm if it is in fact overnight flat spotting? If flatspot is not the problem, what would be the next thing to look into?

If this is a Dunlop issue why wouldn't we hear more about this except a few owners from this forum? I am just naturally nervous something else might be wrong with my Genesis. Everything else seemed to be perfect so far!

Have them check the runout on the wheels themselves. You could have a slightly bent wheel that is exacerbated when the tires are cold. Had a wheel like that on Subaru some years back. The wheel was just slightly out of round and when the tires were cold I felt a slight vibration which seemed to go away once the tires were warm. Good luck!!!

 

[Gen46Tech]

I have the same vibration problem with my Genesis 4.6 sedan with Tech package (around 2000 milage).
The vibration comes from the rear side (seats not steering wheel) and it regularlly occurs during acceleration at around 25 MPH.
It is usually more prominent in the early morning, however I can even feel fine vibration during daytime normal ride.
I cannot feel abnormal vibration at a higher speed than 40 MPH.
I already visited to Hyunday local service twice, however, they only told me that they could not feel abnormal vibration and the car is absolutely in normal condition.
I don't think this abnormal vibration is caused by tire flattening.
Although I am not car person, it seems like from the automatic transmission or shaft to real wheels.
I will be waiting until other customers also complain same problem that Hyundai figure out the cause of vibration and release new TSB to correct it.

 

[kev4]

I have exactly the same problem which concerns me greatly. Although I am hoping it is the tires I also feel the Transmission or rear end may be the problem. Hyundai needs to address this problem.

 

[dond13]

I have the problem on my 4.6 also. I have never mentioned it because I just assumed it was a flat spot on the tires from sitting overnight. I have had it on several cars that I own and since it smooths out after a couple or 3 miles, I just ignore it. I think that I'll have my wheels balanced and see if it disappears, but I doubt it.

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