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  #1  
Old 06-27-2015, 09:29 AM
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285/50/20 ride

I changed the tires on my wifes jeep and went to the bigger size. I love the look of the 285/50/20 and put cooper discover ht plus on. Right away the steering wheel vibrated from 60 to 75 mph and she wasn't happy! Since, I have had the tires balanced 2 more times and still no luck. Of course, i'm the blame since I wanted the larger size and she wont let it go! The question is... Is that common that the up size tire is going to give a worst ride than stock or will a Michelin or top tier tire clear things up? thanks!

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Old 06-27-2015, 10:08 AM
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Re: 285/50/20 ride

If you want to keep the tires, find a shop with a road force machine.

Hunter GSP9700 Wheel vibration Control System solves wheel vibration and tire pull problems that balancers and aligners can't fix

Will probably cost you about 90-100 bucks, but this machine will actually measure the roundness of the tire, runout of the rims, etc. Basically if this machine can't balance a tire then the tires are defective in some way. If there is a high spot on the tire, this machine will show them how to rotate the tire on the wheel so the high spot of the tire matches the low spot of the wheel for a more uniform ride. Make sure you find out what the highest road force measure is after then balance. Try to keep them under 10 lbs. I am very picky about any vibration at speed, and I can tell you that it seems now more than ever I have been having problems just using a regular balance machine. these large wheels are helping (20") but I think tire manufacturing QC has gone to crap lately.

Tire balancers only tackle the balance of the wheel/tire combo, and when you are having issues after a balance you have to go this route. Key also is making sure the shop you use actually knows how to use it.
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Old 06-27-2015, 11:59 AM
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Re: 285/50/20 ride

Thanks JP, but the second balance was with the road force machine. Not that I know, if they know, what their doing. Its just disappointing when the 33000 mile fortenzas road better than new tires! Im hoping I don't have to go back to stock size to make a nicer ride. I could probably live with it, but the wife wants a smooth quite ride.
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Old 06-27-2015, 10:19 PM
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Re: 285/50/20 ride

It has nothing to do with the size and everything to do with the tires being out of balance. Ask them to be replaced with another set. I had Hankooks that wouldn't balance so I went to Yokohama's now it rides smooth at all speeds.
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Old 06-28-2015, 06:40 AM
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Re: 285/50/20 ride

Yep plenty of people running bigger sizes, I would say tyre issue unless u have a damaged/ out of round rim.


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Old 06-28-2015, 10:18 AM
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Re: 285/50/20 ride

Thanks guys for response. That's what I wanted to hear, I really love the look! Any suggestions on a brand that is proven to be smooth and quiet? The tire shop said they would take back and credit, so that's good. Looks like I have one vote for yokahama, any more?
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Old 06-28-2015, 01:22 PM
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Re: 285/50/20 ride

Chances are you had a tire or two that couldnt balance and that could happen with any manufactured tire.
I had 285/50R20 Cooper Zeon LTZ and they balancing fine.
I currently have a set of 285/50R20 Bridgestone Blizzaks and again no issues.
You could give the Cooper Discover another try.
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Old 06-28-2015, 04:10 PM
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Re: 285/50/20 ride

I have Michelin 285/50/20 and ride is super smooth, there are many brands, choose what you like, what you should is that the fact of going to a bigger size doesnt mean you should have a worst ride than before, either the rim or tires you installed must have had some kind of damage.
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