Need wheel & tire advice - '14 Rubi w/ 3.5" lift - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 5 Old 12-12-2014, 10:18 AM Thread Starter
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Need wheel & tire advice - '14 Rubi w/ 3.5" lift

Hello all - I've searched the forum, but didn't find exactly what I'm looking for. I'm getting ready to lift my '14 Rubi Unlimited. I'm pretty sure I'm going with MetalCloak GameChanger 3.5", but RK is still in the running. Either way, I'm not an expert on tires and wheels and need to make sure I pair up the right stuff.

With this rig and this lift, and a desire to run 35" tires, what wheels and tires should I consider? I know I need a backspace of no greater than 4.5", but not sure about offset or even rim size. Some say 17x9, others say 16 for a larger sidewall for airing down.

This is my daily driver, but I also tackle serious trails on weekends. Not really hard-core rock crawling (I'm not interested in breaking my rig!) but I do want to get where I need to go!

Advice, please! Thanks in advance.
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post #2 of 5 Old 12-12-2014, 10:33 AM
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Quote:
Originally Posted by Merito View Post
Hello all - I've searched the forum, but didn't find exactly what I'm looking for. I'm getting ready to lift my '14 Rubi Unlimited. I'm pretty sure I'm going with MetalCloak GameChanger 3.5", but RK is still in the running. Either way, I'm not an expert on tires and wheels and need to make sure I pair up the right stuff.

With this rig and this lift, and a desire to run 35" tires, what wheels and tires should I consider? I know I need a backspace of no greater than 4.5", but not sure about offset or even rim size. Some say 17x9, others say 16 for a larger sidewall for airing down.

This is my daily driver, but I also tackle serious trails on weekends. Not really hard-core rock crawling (I'm not interested in breaking my rig!) but I do want to get where I need to go!

Advice, please! Thanks in advance.
Stick with 17s because you will have far more choices for tires.

Back spacing and offset are the same things in different terms. 4.0 - 4.75" back spacing will work just fine for your setup.

Fuel Offroad makes a LOT of wheels for the JK that have 4.5" back spacing. The only thing to pay attention to on offset is that it is negative. Don't get too worked up about the difference between offset and back spacing, but I'll explain it.

A 17 x 9 wheel with -12MM offset would have 4.5" back spacing. Here's how that works:

9 + 1 = 10 / 2 = 5 - 12mm (.5") = 4.5" Back Spacing

alternatively:

17 x 8.5 w/6mm offset:

8.5 + 1 = 9.5 / 2 = 4.75 = 4.5" Back Spacing

Hope that helps and welcome to JKO!

Marcus


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post #3 of 5 Old 12-12-2014, 03:18 PM Thread Starter
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Thank you, River City Offroad! That is very helpful. I've read SEVERAL explanations of offset, and yours is the first that made it very clear for me. Backspace made sense, but nobody else explained how they were related. Thank you again.

One question: why do you add 1 to the rim width when calculating this? And does this imply that backspace is always half of rim width + 1 (assuming offset is zero)?

Thanks also for the welcome to JKO! I met Bill (DesertJeep, I think) at the American Adventurist T4T campout last weekend, and he encouraged me to register.
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post #4 of 5 Old 12-12-2014, 06:40 PM
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Quote:
Originally Posted by Merito View Post
Thank you, River City Offroad! That is very helpful. I've read SEVERAL explanations of offset, and yours is the first that made it very clear for me. Backspace made sense, but nobody else explained how they were related. Thank you again.

One question: why do you add 1 to the rim width when calculating this? And does this imply that backspace is always half of rim width + 1 (assuming offset is zero)?

Thanks also for the welcome to JKO! I met Bill (DesertJeep, I think) at the American Adventurist T4T campout last weekend, and he encouraged me to register.
There is generally 1/2" of metal outside of the tire mounting surface, so you add 1" back to the wheel to get a real back spacing number. At least that's how I've understood it. Ha ha!


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post #5 of 5 Old 12-13-2014, 08:48 AM
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RCO is right, you have to account for the wheel flange which is why you add 1" to the rim width.

Details: Backspace and Offset - How do they relate?

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