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Old 05-17-2013, 05:13 AM   #1
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Tire weight issues?

The stock 255's on my JK weigh in at 36 lbs, tires Im looking at go anywhere from 62 up to 78 lbs. Big difference. What are the negatives of adding so much more weight to a tire/wheel combo?

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Old 05-17-2013, 08:45 AM   #2
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more weight causes your engine to work harder to turn the bigger heavier tires. This will decrease your fuel mileage, acceleration, and top speed. How much? Hard to say. Also depending how the tire size you chose a regear maybe needed. Example...Im running 4.56 gears with my little I6 and I have two sets of 37". Set 1 weighs 150 lbs, Set 2 weighs 105. With set 1 i cant do the speed limit of 70 mph and i get 12-13 MPG. Set 2 I can run 80 mph on the freeway and if i run 70 mph ill get 14-15ish MPG.

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Old 05-17-2013, 08:53 AM   #3
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I've been on 305/70R16s on alloys for two weeks. They are probably 80 pounds apiece and replaced the P225/75R16s on steelies, which might weigh 35 pounds. I'm running the stock 3.21 gears and the 6-speed.
I have definitely noticed that I use 5th and 6th gear a lot less than I had. My gas mileage is probably lower, but I haven't been paying much attention to that. I have not noticed any stability or steering/tracking problems.
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Old 05-17-2013, 11:31 AM   #4
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2012, 3.21 gears, 6spd. I run p285/70/17 toyo at2 @ 48 lbs.w/ my wheels, weight is around 60+lbs. I can feel power loss but its not that significant. Cruise control in 6th gear is still able to hold its speed @65+. I didn't change my driving style and i'm still getting 19-20mpgs.

Compare mine to the others above. With my goals, i wanted to keep mpg as high as possible and thats what i did.
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Old 05-17-2013, 11:52 AM   #5
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Quote:
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I've been on 305/70R16s on alloys for two weeks. They are probably 80 pounds apiece and replaced the P225/75R16s on steelies, which might weigh 35 pounds. I'm running the stock 3.21 gears and the 6-speed.
I have definitely noticed that I use 5th and 6th gear a lot less than I had. My gas mileage is probably lower, but I haven't been paying much attention to that. I have not noticed any stability or steering/tracking problems.
Dude.... I was getting killed on gas milage running 35's on 17" wheels using 3.21 gears... I could never stay in 6th on the hwy especially if there was stronger wind. I changed my gears to 4.56 and go the power to hold hwy speed and certainly noticed my RPM's go up to 2500. My gas milage...well I think it's still low compared to what other people are posting on here.... Still 12 or 13 mpg and just purchased new bumpers which will add some weight ... Gas milage arrrrrrrg!
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Old 05-17-2013, 12:28 PM   #6
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An additional 10# at the axle is Equivalent to 100 pounds in the cabin. That adds up fast Especially when you consider That is before anybody or anything is in the Jeep! So a tire / wheel That is 10 pounds heavier Multiplied times four Is equivalent to 400 pounds more in the cabin. THEN Add family, gear etc that's a huge weight penalty The vehicle has to compensate for...
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Old 05-17-2013, 12:45 PM   #7
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Dude.... I was getting killed on gas milage running 35's on 17" wheels using 3.21 gears... I could never stay in 6th on the hwy especially if there was stronger wind. I changed my gears to 4.56 and go the power to hold hwy speed and certainly noticed my RPM's go up to 2500. My gas milage...well I think it's still low compared to what other people are posting on here.... Still 12 or 13 mpg and just purchased new bumpers which will add some weight ... Gas milage arrrrrrrg!
I will probably re-gear at some point, even though I don't really 'need' to with the 33's I'm running. I figure it can't hurt, and if I ever move to 35's or 37's, I'll be ready for it.
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Old 05-17-2013, 06:38 PM   #8
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so me running 315-70-17's on my stock wheels with spacers on my 13 jk 6sp 3.73 geared ride will kill my mpg's, the tires are like 30 lbs more each, thats like toting 1200 lbs around? Makes me want to reconcider my OME lift and big tire plans.
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Old 05-17-2013, 07:02 PM   #9
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Lower gas mileage, worse acceleration, more strain on engine/transmission, and reduced braking effectiveness. That's about it....besides the cost. I run 35s now.
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Old 05-17-2013, 07:13 PM   #10
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Math may be a little off !
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Old 05-17-2013, 07:29 PM   #11
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I've got 35 MTRK's and 16 inch Moabs. That wheel and tire combo is most likely pushing 100 lbs. When it had the stock 31's and 4.10's it got 17, when it got the 33's it got 15. Now it has 35.s and 4.88's and it gets 17 again. Not to bad for a flying brick.
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Old 05-17-2013, 08:31 PM   #12
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braking is greatly effected. I had my first emergency stop today with my 33" total weight measured on a postal scale is 82lbs (285/75-16 toyo AT II's and raceline raptors 16X8) was driving and saw two guys get into a scuffle and was watching them for a second and traffic had stopped for a pedestrian in cross walk and thought I was going rear end the car ahead of me, fortunately I stopped in time but I definetly could tell my stopping distance was increased.
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Old 05-17-2013, 08:38 PM   #13
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I think my 35s may weigh around 68 lbs. The braking was quite a bit worse when compared to my stock 32s. I had to upgrade my brakes. It was really bad coming down mountain passes. Safety-wise, that was a big deal.

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