Any issues putting 18's on my 2015 V8 K900? How much will it improve ride quality? - Kia K900 Forum
 
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post #1 of 5 Old 03-10-2021, 04:47 PM Thread Starter
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Default Any issues putting 18's on my 2015 V8 K900? How much will it improve ride quality?

I mentioned in another thread issues with tires. I've fixed those up now and am happy with that issue. What I'm still not happy about is ride quality. Car doesn't take bumps well. I have 2015 K900 VIP V8 with 19 inch wheels. I've had the dealership check my car up and down and there are no issues.

I'm told from car experts that going down in size will help with ride quality. I know the V6 K900 has the same sized 18s all the way around.

1.) Can I sub out my wheels for 18s? And I can just use the same tire all the way around like the V6 version does?

2.) Will this dramatically improve my ride quality? I don't want to go through all of this (cost will be $1600-2000 to sub out 4 wheels and 4 new tires) if I don't get dramatic improvement.

Thanks!
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post #2 of 5 Old 03-14-2021, 01:38 AM
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I haven't made any tire experiments with mine, pappy97, so I can't address that . I have the 19"s that came on my car.

I do agree with you that the ride quality is not up to what you expect from this class of car--much too harsh. It's not nearly as good as my old Town Car, for instance.

Just in case you don't know, the car was made available with air suspension most everywhere it was sold except the US and Canada. I figure, myself, that's the reason for the poor ride. The suspension they cobbled up for this market is just not quite up to the job, and I'm not at all confident different tires would change it.

However, that's just my opinion. If you decide to make the swap, let us know how it goes.

2016 V8 VIP+, black with white interior
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post #3 of 5 Old 07-02-2021, 03:01 AM Thread Starter
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Quote:
Originally Posted by pappy97 View Post
I mentioned in another thread issues with tires. I've fixed those up now and am happy with that issue. What I'm still not happy about is ride quality. Car doesn't take bumps well. I have 2015 K900 VIP V8 with 19 inch wheels. I've had the dealership check my car up and down and there are no issues.
In case anyone comes back to this looking for discussion about K900's, I just replaced my rear shocks on my car because, despite what anyone said, I became convinced that my rear shocks were worn and the cause of a rough ride. The car wasn't taking bumps well past 60k miles, and it felt like it was always the rear tires, not the front, ie driving over the same bump with front and back, it was the back that harsh.

Now that I have replaced the shocks (finally, at 72k miles), the ride is much better. I don't hate the car anymore! Not saying it is silky smooth like my previous LS460, but it is like a normal car again that doesn't take bumps so harshly. In fact, despite not "needing it" according to mechanics, later this summer I am going to replace the front struts too. I want that original ride quality!

I know shock manufacturers say shocks should be replaced every 50k miles, but that's mostly BS. But I feel like the 50k rule might actually apply for the K900. And remember that no third party makes K900 struts/shocks, you need to get OEM replacement from Kia, which is what I did.

I went to my local Kia dealership (The one I like), parts and labor were just under $650.00, which I'm fine with.

Last edited by pappy97; 07-02-2021 at 03:06 AM.
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post #4 of 5 Old 07-03-2021, 12:44 AM
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Thanks for the update. I'll keep this in mind as my mileage accumulates.

2016 V8 VIP+, black with white interior
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post #5 of 5 Old 07-12-2021, 02:33 PM
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Thanks for the update. I have gone from 37,000 miles to 54,000 in fourteen or fifteen months of interstate trips, and I am not at all displeased with the ride quality on my 2015 (and I have owned three Lexus LSs). However, if I do get to that point, I will start with the rear shocks.
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