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Old 02-23-2013, 09:48 AM   #1
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Stock SR-A's to Duratrac 285/70R17

I have a stock 2012 Sport S with 3:21's. The SR-A's each weigh in at 36 pounds, while the Duratrac 285/70R17 come in at 54 pounds each. That's adding a lot of un-sprung weight.

Assuming I mount the Duratrac's on my stock rims with 1.5 inch spacers, what was the "seat of the pants" loss of power?

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Old 02-23-2013, 09:56 AM   #2
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54 lbs is a big difference from 36 lbs and your also going to a tire that is a heavier load range and has more tread rolling resistance. You're going to lose power but at the end of the day and depending on how you drive your jeep, not much. Most jeepers run much heavier tires even with the stock gears in some cases.

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Old 02-23-2013, 01:22 PM   #3
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I have a stock 2012 Sport S with 3:21's. The SR-A's each weigh in at 36 pounds, while the Duratrac 285/70R17 come in at 54 pounds each. That's adding a lot of un-sprung weight.

Assuming I mount the Duratrac's on my stock rims with 1.5 inch spacers, what was the "seat of the pants" loss of power?
I'm in a 2012 Sahara with 3.21's as well. It's a huge difference the first time you drive off on the new tires, like you've got a few extra portly passengers sitting with you. The lower the pressure you run in the new tires, the more rolling resistance there will be.

Play around with the psi until you find the balance you like between rolling resistance and ride comfort. But don't worry, you get used to the new tires after a few days and never look back
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Old 02-23-2013, 01:31 PM   #4
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FWIW

I'm running 315/75/16 Duratracs with a manual tranny and 3.21s. No regrets or issues.
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Old 02-23-2013, 01:35 PM   #5
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FWIW

I'm running 315/75/16 Duratracs with a manual tranny and 3.21s. No regrets or issues.
Good to know. This is my next set of tires once mine wear out
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Old 02-23-2013, 01:44 PM   #6
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Good to know. This is my next set of tires once mine wear out
The info you hear online about how terrible 3.21s are is really up the beholder at the end of the day. I've run everything from 29", 31", 32", 33", and now 35" tires from AT to MTs with the same gears. No problem and no desire to re-gear. It works for me, it may not for others. My only need now is a pro cal to adjust things but that isn't even that big of deal with the manual tranny.
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Old 02-23-2013, 01:48 PM   #7
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Long term you will be money ahead to buy 15" rims and then you will be almost exact same weight at stock SRA's. The cost of rims and 33X12.50/15 dt is only a little more than the cost of the 17" tires then the next time you need tires you will be saving money.The 15" tires are a good bit cheaper.
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Old 02-23-2013, 09:38 PM   #8
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Thanks for all the responses. I purchased my Jeep off the lot without doing research into gears, etc. However, I don't plan on wheeling - just want some aggressive looking tires that perform well on all surfaces including snow and ice.

I have been looking at 15 and 16 inch rim options.

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