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  1. 11-15-2021, 06:16 AM #1
    North Ga Couple
    North Ga Couple is offline
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    Bigger Tires or not?

    Folks I am about ready to replace the tires on our 2016 2600rb. It has 205/75/R15 now, I'm thinking of going to size 225/75/R15. Has anyone does this, or what are your thoughts?

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    Tom and Kathy
    North Ga
    North Ga Couple
    Dodge Ram 1500
    GD 2600 rb
    one dog, Sadie
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  2. 11-15-2021, 06:49 AM #2
    attaboy
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    We made the exact change you are considering over a year ago on our 2450RL
    with no problems.
    Bob A.
    Bob & Alice
    2020 Ram 3500 Limited Megacab SRW Aisin
    2020 Grand Design Imagine 2450RL
    ProPride 3P 1400 lb. bars WDH
    Micro Air easy start, Goodyear Endurance Load rated "E" Tires
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    Previous: 2019 Ram 1500 Limited
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  3. 11-15-2021, 07:10 AM #3
    AZMike
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    Quote Originally Posted by North Ga Couple View Post
    Folks I am about ready to replace the tires on our 2016 2600rb. It has 205/75/R15 now, I'm thinking of going to size 225/75/R15. Has anyone does this, or what are your thoughts?

    Thanks

    Tom and Kathy
    North Ga
    Should be OK as long as you have enough clearance (3 1/2 to 4") above the tires.
    Mike & (RIP Karen)
    2021 Imagine 2600RB
    2011 Toyota Tundra 5.7 RW, Tow Package
    Husky Centerline WDH
    Champion 2500DF, Prodigy P2
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  4. 11-15-2021, 07:43 AM #4
    BobLandry
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    The aspect ratio is the same. The diameter of the tires should not be affected.
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
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  5. 11-15-2021, 07:49 AM #5
    AZMike
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    Quote Originally Posted by BobLandry View Post
    The aspect ratio is the same. The diameter of the tires should not be affected.
    225/75R15 is, in fact, 1.2" taller than 205/75R15 which will result in a clearance reduction of .6". Granted, it's not much, but it's there.Click image for larger version.  Name: Tire Size difference.jpg  Views: 41  Size: 95.2 KB  ID: 37695
    Last edited by AZMike; 11-15-2021 at 07:53 AM. Reason: added tire size calculation
    Mike & (RIP Karen)
    2021 Imagine 2600RB
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    Champion 2500DF, Prodigy P2
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  6. 11-15-2021, 08:03 AM #6
    Hoopy Frood
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    Quote Originally Posted by BobLandry View Post
    The aspect ratio is the same. The diameter of the tires should not be affected.
    But the width has changed, which when multiplied by the aspect ratio, will result in a taller tire. The aspect ratio would have to change for the overall height to remain the same. Drop the aspect ratio to around 70 the tire height will be closer, still a little high though.
    Howard and Peggy
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  7. 11-15-2021, 08:11 AM #7
    BobLandry
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    At any rate, the increase in diameter is not going to require the 3-4" clearance that some on here have claimed.
    2010 Jayco 26(SOLD)
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  8. 11-15-2021, 08:13 AM #8
    Hoopy Frood
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    I think they're just saying to allow for spring movement, and vertical wheel travel.
    Howard and Peggy
    2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
    His: 1999 Honda Interceptor
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  9. 11-15-2021, 08:16 AM #9
    huntindog
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    Dexter states 3", and 1" between the tires on a tandem axle
    2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
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  10. 11-15-2021, 09:17 AM #10
    goducks14
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    205/75/15 are 27.1" dia.
    225/75/15 are 28.1" dia.

    You'll lose .7" of clearance.
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