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18” vs 16” Tires - Ride comfort

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Old 06-30-2018, 10:50 AM
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Default 18” vs 16” Tires - Ride comfort

I recently stole a absolutely mint 2000 DII Kinver Sand with 130,xxx a few months ago and it has 18” rims. They are fitted with Cooper tires. I have been a Michelin man my whole life, and these Coopers are... crap. The ride is just absolutely terrible. You feel EVERY single crack, pebble, bump in the road. It sends shockwaves through the entire truck. The ride is so bad that I dropped the psi to ~34-36 just to get a better ride. I don’t care how it affects the wear on the tires because I am replacing them soon. I need opinions from owners that have knowledge of how a DII rides on 16”s vs 18”s. Current tires are 255/55R18.

My experience on ride comfort between the 16”s and 18”s is bookended by 20 years: in 2000 I owned a ‘99 with 16”s and in 2018 I own a 2000 with 18’s. I remember my ‘99 16” driving like a truck (through the bumps, not over them, like a true DII) but was a relatively smooth ride with my Michelin’s.

Does anyone one have any real world experiences between riding on the two different diameter rims? Before I go and drop $1,500 on a new set of 18” Michelin’s I want to see if anyone on the forum has any insight. I don’t have any issue at all with sourcing a set of unique factory 16”s.

Also so does anyone have recommendations with tire size on 18”s? The truck isn’t lifted and is stock, except for the Ashcroft CDL. Discount Tire suggested 265/60R18s for a little bit more sidewall.

Any inout out you guys (and gals) can provide would be greatly appreciated.
 
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Old 06-30-2018, 05:25 PM
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16's= more rubber = softer ride
 
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Old 06-30-2018, 09:35 PM
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I changed my 03 from 18 to 16". Ride quality is much better. Been running 25 PSI recently as the D2 is seeing little on road use.
 
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Old 06-30-2018, 11:26 PM
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Running less air in a tire will give it a softer ride. You would need to run rovers at similar air pressures to see the difference
 
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Old 07-01-2018, 12:04 AM
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I find that I have that type of ride when my shocks or springs are shot. You'll have to asses the condition of your suspension before you go deciding what tires to buy. Seriously, tires don't cause the conditions you describe, suspension issues do... you probably have clapped out OG springs.
 
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Old 07-01-2018, 01:28 AM
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Running 18" on worn Cooper tires at the moment. Intend to upgrade to some decent offroad rubber maybe next month or so... but I haven't noticed a harsh ride.

I've got good springs+shocks, though.

34 psi fronts and 40 psi rears.
 
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Old 07-01-2018, 11:05 AM
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Thank you for the input. I’m gonna take a look at the springs/shocks.
 
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Old 07-01-2018, 11:06 AM
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Originally Posted by Dave03S
I find that I have that type of ride when my shocks or springs are shot. You'll have to asses the condition of your suspension before you go deciding what tires to buy. Seriously, tires don't cause the conditions you describe, suspension issues do... you probably have clapped out OG springs.
OG springs? Can you clarify?
 
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Old 07-01-2018, 12:41 PM
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Original
 
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Old 07-01-2018, 01:54 PM
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16" rims are larger sidewall tires and often softer so a better more comfortable ride but the compromise is tarmac roadholding.

18" rims are a harder lower profile tire so a harder ride but better tarmac roadholding.

Of course the above data depends entirely on the big factor of what tire pressures you run.

I drive 95% of my time towing on tarmac so roadholding is important and I run 255 50 R19 tires or better known to some as 'denture rattlers'
 


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