2018 3500 Converting 20" to 18" Wheels & Tires - Dodge Cummins Diesel Forum
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post #1 of 54 (permalink) Old 12-15-2019, 03:50 PM Thread Starter
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Question 2018 3500 Converting 20" to 18" Wheels & Tires

So I am a newb for sure. I recently picked up a brand new leftover 2018 3500 Big Horn with the 20" wheel package, mainly because I wanted the 6-speed manual transmission. Anyway, the stock 20" tires, and the wheels are boring and don't work well in these WV Mountains.

So, I would like to order a new full set of Fuel Wheels and a set of Nitto Ridge Grapplers or the Toyo Open Country MT tires in 35x12.5Rx18LT. My question is, are there any mechanical issues with converting these 20" Ram wheels to a set of 18" Fuel wheels such as brake rotors, brakes, brake lines, TPSI sensors, etc?

The tires should be Load F, but on 20" tires, you only get a 3640lbs load rating, where as the Load F, 18" tires give you the heavier 3970lbs load rating. I like the taller sidewall of the 18" tires, and they give you a higher Load Rating for towing/carrying loads.

What do you guys think?

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post #2 of 54 (permalink) Old 12-15-2019, 04:06 PM
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You shouldn't have any issues at at unless you go with a crazy off set wheel

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post #3 of 54 (permalink) Old 12-15-2019, 04:12 PM
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Yes you will be fine just stay in the + offset!! Most recommended is +18 or so...
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post #4 of 54 (permalink) Old 12-15-2019, 04:17 PM
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Quote:
Originally Posted by Glockem^45 View Post
So I am a newb for sure. I recently picked up a brand new leftover 2018 3500 Big Horn with the 20" wheel package, mainly because I wanted the 6-speed manual transmission. Anyway, the stock 20" tires, and the wheels are boring and don't work well in these WV Mountains.

So, I would like to order a new full set of Fuel Wheels and a set of Nitto Ridge Grapplers or the Toyo Open Country MT tires in 35x12.5Rx18LT. My question is, are there any mechanical issues with converting these 20" Ram wheels to a set of 18" Fuel wheels such as brake rotors, brakes, brake lines, TPSI sensors, etc?

The tires should be Load F, but on 20" tires, you only get a 3640lbs load rating, where as the Load F, 18" tires give you the heavier 3970lbs load rating. I like the taller sidewall of the 18" tires, and they give you a higher Load Rating for towing/carrying loads.

What do you guys think?
I have 35x12.5x18lt ridge grapplers on my 2017 ram 2500 with +1 offset fuels only had to trim inside plastic off of flares at the front,very minimal. Clears rotors and everything just fine.
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post #5 of 54 (permalink) Old 12-15-2019, 04:51 PM
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What about the 20" makes them not work well in West Virginia???
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post #6 of 54 (permalink) Old 12-15-2019, 05:46 PM
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Originally Posted by Ltngdrvr View Post
What about the 20" makes them not work well in West Virginia???
Just a guess but the 20's have shorter and stiffer sidewalls, might ride a bit rougher and not the best tire for off-roading.
20's look good around the shopping malls though.

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post #7 of 54 (permalink) Old 12-15-2019, 07:52 PM Thread Starter
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Quote:
Originally Posted by Ltngdrvr View Post
What about the 20" makes them not work well in West Virginia???
I just think the stock 20" wheels are boring. As for the stock tires, they aren't doing well in the snowy/icy roads. I have slipped bad several times in this truck as we approach wintertime already, and that isn't a good feeling in a brand truck.

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post #8 of 54 (permalink) Old 12-15-2019, 07:53 PM Thread Starter
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Originally Posted by skeemsCTD View Post
I have 35x12.5x18lt ridge grapplers on my 2017 ram 2500 with +1 offset fuels only had to trim inside plastic off of flares at the front,very minimal. Clears rotors and everything just fine.
Sweet rig there skeemsCTD. Curious, do you have a leveling kit on the front to fit those 35's under there?

Also, did you go from the 20" wheels down to the 18" as well like I am wanting to do?

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post #9 of 54 (permalink) Old 12-15-2019, 07:55 PM Thread Starter
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Originally Posted by SRich12 View Post
Yes you will be fine just stay in the + offset!! Most recommended is +18 or so...
Oh, I thought most guys run the -12 offset on the Fuel wheels and 35s ?

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post #10 of 54 (permalink) Old 12-15-2019, 08:06 PM
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I went with the Method Mesh 18x9 +18. With the factory flares, they sit just about flush with the flares. Not that you asked, imho the fuel wheels are over played. Every other Ram has fuel wheels. Method as well, if were being honest. Look around, see if there are other styles/brands you like? Flame away!!


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post #11 of 54 (permalink) Old 12-16-2019, 01:11 AM
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Quote:
Originally Posted by upflying View Post
Just a guess but the 20's have shorter and stiffer sidewalls, might ride a bit rougher and not the best tire for off-roading.
20's look good around the shopping malls though.
I may need to look into ditching my 19.5s as Im only 1/2 away from joining the Mall Hauler Clique.

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post #12 of 54 (permalink) Old 12-16-2019, 08:12 AM
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Wait... Are shopping malls still a thing?
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