I just weighted my Tires (KM vs Cooper ATP). - Jeep Wrangler Forum
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Old 07-10-2015, 12:14 AM
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I just weighted my Tires (KM vs Cooper ATP).

The OEM Rubi KM's on stock rims weigh 72.9 lbs.

Cooper LT285/70/17 ATPs on MB TKO wheels weigh 80.0 lbs.

I gained 7.1 lbs by going to 33's.

285/70-17 Cooper Discoverer ATP Tires

Wheel Details - Discount Tire Direct

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Old 07-10-2015, 07:38 AM   #2
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The stock wheels are 25 lbs. I think IIRC and the MB wheels are around 20 lbs. So basically those 285/70 tires are heavy. Around 60ish lbs. And that's with a mild tread pattern and no sidewall tread. So you can imagine how heavy a MT or aggressive AT tire is in that size. No wonder fuel economy goes to hell after upgrading. You gotta' pay to play I guess.

Thanks. Your results were very similar to mine. My Falkens in 285/75 were 63 lbs. each and Cooper ST Maxx was more than that in 285/75...just too much weight for a DD.

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Old 07-10-2015, 07:42 AM   #3
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I went from Stock wheels and tires on my Ruby to 315/70/17s Cooper Stt Pros and level 8 trackers. This combo comes in at a hefty 93 lbs per corner. Used the procal to adjust for tire size (verified speedo / odometer with app) and have run 2 full tanks of gas with no impact on mileage.
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MetalCloak 2.5" Game Changer RockSport Edition. Bushwacker flat fenders. Cooper Stt Pro 315/70/17. a whole bunch of other stuff.
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Old 07-10-2015, 07:08 PM
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Quote:
Originally Posted by WXman View Post
The stock wheels are 25 lbs. I think IIRC and the MB wheels are around 20 lbs. So basically those 285/70 tires are heavy. Around 60ish lbs.
As I recall, Discount Tire listed the tire in the low to mid 50 lb range on their computer system. I was unable to weight the tires separately however.

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Originally Posted by Jus Jim View Post
I went from Stock wheels and tires on my Ruby to 315/70/17s Cooper Stt Pros and level 8 trackers. This combo comes in at a hefty 93 lbs per corner. Used the procal to adjust for tire size (verified speedo / odometer with app) and have run 2 full tanks of gas with no impact on mileage.
Was that mileage (mpg I assume) measured by gallons at the pump and miles on your odometer or based on the internal computer?
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Old 07-10-2015, 07:10 PM   #5
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calculated, computer isn't worth a damn.
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Old 07-14-2015, 08:47 AM   #6
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Quote:
Originally Posted by Jus Jim View Post
I went from Stock wheels and tires on my Ruby to 315/70/17s Cooper Stt Pros and level 8 trackers. This combo comes in at a hefty 93 lbs per corner. Used the procal to adjust for tire size (verified speedo / odometer with app) and have run 2 full tanks of gas with no impact on mileage.
You realize that's impossible just by the laws of physics alone, right? We've gone over this in other threads, but when you go with taller, wider, heavier tires you WILL lose fuel economy, braking, and acceleration. There is simply no way around it.

People can calibrate, regear, add CAIs and exhausts, whatever they want...but at the end of the day the Jeep is working harder to turn those tires and the wind resistance is higher due to the height and the friction with the road surface is greater due to the tread pattern and width. You're gonna' spend more money at the gas pump. That's just a fact of life.

I lost a calculated 2 MPGs going to 33" Duratracs with a ProCal to calibrate everything, and that's a super lightweight combo that was only like 8 lbs. heavier than stock.
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Old 07-14-2015, 02:22 PM   #7
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other factors are involved besides weight alone. psi, tread type heck you get lower rpm with a taller tire so depending on gearing you might get in your sweet spot with a bigger tire yada yada. If anyone has paid attention to my threads I have been from 29-35" going up a bit a time and I have noticed very little mpg difference with my auto 410's. I just scored a steal of a deal on some new bfg 34x10.5-17 KO2's that I mounted on my stock rubi rims and slapped on this morning. They weigh ~20lbs less mounted on stock rims vs my Toyo 35/x12.5-17 mounted on Race line monsters depending on the tire as I used a bathroom scale which is tough to be accurate on but generally the BFG combo was around 80-82lbs a combo and the toyos around 100-103lbs getting ready to head on a road trip to Colorado so will see how they do. I really doubt mpg will be over a 1 or 2 better but brakes feel stronger and revs more at speed so feels peppier as they really are about 2" shorter then the Toyos. I figure once in motion a heavier tire wants to continue in motion so if you are not stopping and starting just on highway mpg will not be drastically affected. If I was drag racing I would pick the smaller lighter tire


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