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  1. #1
    Sr. Apprentice
    Join Date
    Jul 2010
    Location
    Myrtle Beach, SC
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    34

    Default Anyone swapped factory 20's for 18's on a NBS Silverado?

    Hi all, I did a search and couldn't find this info anywhere. I have a 2008 Silverado extended cab with factory 20's and Goodyear LS 2 tires. This damn thing rides like a buckboard. I am thinking of swapping for a factory set of 18's that are a very similar style. The main reason being, I have driven a 2009 Silverado extended cab at work, identical to mine, that has the factory 18's and the difference in ride quality is night and day.

    My truck kicks very sharply over bumps and bad pavement and will beat you to death. I'm wondering if anyone else has done this or have you gone from 18's to 20's and noticed a decrease in ride quality?

    I know my gas mileage will also increase for two reasons. 1) the 18's have less rotational mass (weigh less). and 2) they have a smaller (narrower) tread width which will allow them to coast further when I lift off the gas pedal. I have driven MANY GM trucks and they all coast a long way after lifting off the gas. Not so with my 20's. When I lift off the gas on mine, it starts slowing immediately.

    I know some of you will think I am de-valuing my truck by removing the factory 20's and you are right to a point. If I were to trade it in the next 2-3 years, I would reduce my trade value by $800-$1000. However if I keep it 7-8 years or more, it really won't make a difference.

    The bottom line is I need to produce a better ride quality for everyday driving and this seems to be the easiest solution. It is also the cheapest, as it won't cost me a dime to swap.

    The tires on the 18's are 265, 65 18 Bridgestone Dueler A/T's.

    I welcome any and all comments and opinions. Oh, and I'm probably going to do this VERY soon, so please chime in!

    Click image for larger version. 

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    18" rim
    Frederick - South Carolina
    2008 Silverado LT1 5.3 with tow pkg and 20's

    I work for a GM dealer.

  2. #2
    Sr. Apprentice
    Join Date
    Jul 2010
    Location
    Myrtle Beach, SC
    Posts
    34

    Default

    Bueller? Bueller?

  3. #3
    Sr. Apprentice
    Join Date
    Jul 2010
    Location
    Myrtle Beach, SC
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    Default

    47 views and not one response? Really?

  4. #4

    Default

    Wish I could help you out. I wonder if it has to do something with either the tires, brand, or shocks and suspension. I have a 99 Z with the Bridgestone Dueler A/T's and Bilstein Shocks and my truck rides smooth with some weight in the rear, but when the bed is empty it is rough and bumpy. I don't know what shocks they are putting on the trucks anymore. But the Z71 package is designed for off the highway use and makes the most use of suspension travel to keep the wheels on the ground when on the trail or dirt roads. So I really don't know if downsizing the rims will help.
    Paul


  5. #5

    Default

    Are you running the factory recommended air pressures?

  6. #6

    Default

    My Sierra has the same tires with the GMC chrome 20" rims, and my ride is very comfortable. My wife thinks it's one of the best rides for long trips that she's ridden in. I also have the Z85 performance/trailering suspension which may make a difference.

  7. #7

    Default

    Did find this. Z-71 package includes 46mm shocks, off-road jounce bumpers, stabilizer bars and skid plates, so it's going to be a much firmer suspension, and you'll feel that it's a little tighter and more rigid, while the Z-85 mainly consists of just 36mm piston monotube shocks, to enhance toungue weight and handling when the trailer is on the back. Handling with just the Z-85 will be about the same as the regular Silverado Classic.

  8. #8

    Default

    Quote Originally Posted by Pats1pab1 View Post
    Did find this. Z-71 package includes 46mm shocks, off-road jounce bumpers, stabilizer bars and skid plates, so it's going to be a much firmer suspension, and you'll feel that it's a little tighter and more rigid, while the Z-85 mainly consists of just 36mm piston monotube shocks, to enhance toungue weight and handling when the trailer is on the back. Handling with just the Z-85 will be about the same as the regular Silverado Classic.
    Thanks Paul. I had no idea what it meant other than that it is supposed to be a little smoother ride. I guess I need to find a boat to tow now.

  9. #9

    Default

    Quote Originally Posted by Als09Sierra View Post
    I guess I need to find a boat to tow now.
    I need one too!! Maybe we can find a buy one get one free and go in on halves... all I get to tow is tools and trash to the dump!

  10. #10

    Default

    Quote Originally Posted by Pats1pab1 View Post
    I need one too!! Maybe we can find a buy one get one free and go in on halves... all I get to tow is tools and trash to the dump!
    LOL...I'm with you. Taking a dump run tomorrow.

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