18” vs 20” Wheels
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Mountain Pass
Joined: Aug 2018
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From: Clayton, NC
Fleet Mechanic
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From: Tomball, Tx
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From: Jasper, Texas
Everyone has an opinion, but ride quality will have a lot more to do with tire brand, type and size than the one inch of rim vs tire at the sidewall. To achieve the same ride heigth, an 18" rim will require more sidewall a larger aspect ratio. A 20" rim will will require less sidewall a smaller aspect ratio (less rubber/less weight). Generally speaking at the same ride heigth a 20" rim and tire will have less rotational mass and therefore more efficiancy, better fuel mileage. That is why auto manufacturers now engineer larger rims and less rubber, also shorter sidewalls provide for better handling and performance. Look at the trend in all racing venues that require cornering. True, taller sidewalls will absorb more shock when off-road. I went from 275/70/18 to 295/70/18 to fill in my fender wells some; I lost 2-3 mpg. Recently I went from the 295/70/18 to 275/65/20 (these wheels are approximately the same heigth) and gained my mileage back.
My 2 cents worth.
My 2 cents worth.
Tuned
Joined: Jul 2018
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Well that sucks. So worse case is that I have to change the front springs back down 1 step to go back to the standard F350 front spring rate correct? I believe the camper package only adds rear stabilizer bar as the standard F350 already comes with overload spring package. Correct?
Tuned
Joined: Oct 2016
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It should also be noted that there are two different size 18 tires available. The standard 18's are "all season" 65 series, and the optional (required for FX4 if I remember correctly) are "all terrain" and are 70 series (taller sidewall).
Fleet Mechanic
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From: Tomball, Tx
My other 4 tires are 275/65 R20's.
Fleet Mechanic
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From: Tomball, Tx
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Tuned
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3.55 is the lowest you can go in SRW. Moving to 37s converts to 3.08 if memory serves, but only if you go off the smallest tire as the starting point. There are three tire sizes available with the 3.55, so converting from the middle size (which I'm assuming the speedometer is probably set for - I doubt it is recalibrated for for the various tire options since it is almost certainly installed long before anyone on the line has any clue what tires will actually be on any particular truck) its probably more in the teens with 37s.
If I could, I would have gone with a 4.10 on the SRW. My wife's Rubicon is 4.10s with 35s and its a little more sluggish than stock, but it doesn't have 900 ft/lb.
If I could, I would have gone with a 4.10 on the SRW. My wife's Rubicon is 4.10s with 35s and its a little more sluggish than stock, but it doesn't have 900 ft/lb.
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