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Old 07-13-2015, 07:46 PM
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20x9 wheels, +18mm offset..

I have an opportunity to pick up some 20x9 Rockstar II wheels that have a +18 offset for only $400. They are a universal 5 lug that support 5x5 and 5x150 bolt patterns so I am going to need an adapter to get them to my bolt pattern and to fit spacing wise. According to this offset to backspacing converter, a 9" deep wheel with a +18mm offset makes 5.71" of backspacing. If I got bolt pattern adapters that were 1.25" (31.75 mm), would I subtract that from the 18mm, making the offset -13.75mm which converts to 4.46" of backspacing? Trying to decide whether or not to pick up these wheels.

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Old 07-14-2015, 01:01 PM   #2
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I have an opportunity to pick up some 20x9 Rockstar II wheels that have a +18 offset for only $400. They are a universal 5 lug that support 5x5 and 5x150 bolt patterns so I am going to need an adapter to get them to my bolt pattern and to fit spacing wise. According to this offset to backspacing converter, a 9" deep wheel with a +18mm offset makes 5.71" of backspacing. If I got bolt pattern adapters that were 1.25" (31.75 mm), would I subtract that from the 18mm, making the offset -13.75mm which converts to 4.46" of backspacing? Trying to decide whether or not to pick up these wheels.
Your math is correct and with the 1.25" spacer you should be good to go. A couple things I'd consider if I where you, first off the spacer adapters are going to run you about $125 on Amazon, secondly will the wheels be worth $525 to you all in knowing they're on there with spacers? If the answer is yes jump on them!

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Old 07-15-2015, 07:17 PM
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Your math is correct and with the 1.25" spacer you should be good to go. A couple things I'd consider if I where you, first off the spacer adapters are going to run you about $125 on Amazon, secondly will the wheels be worth $525 to you all in knowing they're on there with spacers? If the answer is yes jump on them!
He included a set of 1.5" 5x150 spacers that I am going to sell so yes, I think it's worth it. Just picked them up a few hours ago. Now to decide on sticking with 35's or going 37's since I'm going to be regearing anyway.. hmm
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Old 07-15-2015, 08:49 PM   #4
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Your Sahara has a dana 30 in the front and if you are debating on 37's you should sleeve and gusset the front. It will still be weaker than the dana 44 but it will help with the axle tubes. Don't forget balljoints too.
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Old 07-16-2015, 03:58 PM
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Your Sahara has a dana 30 in the front and if you are debating on 37's you should sleeve and gusset the front. It will still be weaker than the dana 44 but it will help with the axle tubes. Don't forget balljoints too.
Yeah I was looking into what all needs to be done to run 37's and it looks like to do it right can get pretty expensive for something that will rarely see any trails (DD). I'm now looking at tires and can see why this guy was getting rid of the wheels for so cheap-- r20 tires are expensive as hell!
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Old 07-16-2015, 10:15 PM   #6
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Yeah I was looking into what all needs to be done to run 37's and it looks like to do it right can get pretty expensive for something that will rarely see any trails (DD). I'm now looking at tires and can see why this guy was getting rid of the wheels for so cheap-- r20 tires are expensive as hell!
They are expensive. I paid 380.00 a piece for 35x13.50x20. For a Kumho 37x13.50x20 is 415.00 each. But you still need to do everything to your Jeep's front end to run them with less risk of breaking something. No matter what you do, be sure to enjoy it everyday.

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