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Unread 08-25-2014, 09:41 AM   #1
ttusqrl
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Join Date: Oct 2007
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Tire Weight

Yes, another tire thread. I've done my research and had trouble finding much on what I was looking for.

Question: Has anyone determined the max weight you'd look to put at the corners? Splitting up the question, what do we think our stock CV shafts will run weight wise, and what will the 3.73 handle?


I'm looking for new wheels and tires, and I'm leaning toward a 285/75/17. That said, the tires I'm looking at are between 65-70 lbs. I obviously don't want to have a failure, but I'm also curious how bad my 14 MPG highway will drop. It's bad enough I have to stop every 3 hours to fill up

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Unread 08-25-2014, 10:07 AM   #2
Forcus
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You know, nobody ever asks about weight so I'm happy you asked.

There is no hard and fast number wher everything goes to hell. However every pound has an impact. More weight means slower acceleration, slower deceleration, more brake wear, lower fuel economy, faster shock wear, less efficient shock function, etc.

My tactic is to minimize weight change from stock. When I picked my tires, I found that the manufacturer had the same sizes in P-metric (passenger car) and LT (light truck) tires, along with several load ratings. All of this lines out to weight carrying capacity, and by extension, mass from more rubber and more steel / reinforcing material.

Bottom line, the stock weight of tires was around 35 lbs each (don't recall the exact number), the P-metric were 42 lbs each and the lightest (C-load rating I believe) LT in the same size was 56 lbs. After looking at the load rating for the passenger car tire in lbs, I found the rating more than adequate for current and future needs, and saved 14 lbs per corner while increasing weight per corner by only 7 lbs (these are rough numbers, I don't recall the exact ones without looking.

Your mileage will vary... the tire you need should be the one that fulfills your requirements while not being overkill. Running around on heavy E Load LT tires on a mid-size SUV is overkill but I've seen it done and hey, if it makes you happy...!
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Unread 08-25-2014, 10:59 AM   #3
JeepN4KC
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Well, I know XJ folks are running around with 35s or better on stock 3.55 gears. So, I doubt the 3.73s would be an issue. The cv axles aren't going to explode because you put a heavier tire on. That would be far too dependent on what the driver is doing with the Jeep on big tires and stock cv shafts. Dd'ing will likely not be an issue regardless of tire weight - with the exception that anytime you modify the Jeep it will be more prone to premature failure of factory parts.

What do your current tires weigh? How much more will the 285s weigh? How heavy on the skinny pedal are you? Lots of variables in regards to mpgs but they will suffer relative to your current set-up.

Long answer short - I don't think there is a definitive answer to your questions.
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Unread 08-25-2014, 11:41 AM   #4
caronaxtr
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I was running 33's (BFG AT's ) on stock axles & gears in my XJ up to a few weeks ago & it wasn't that bad. Auto tranny was always searching for a gear though, especially on highways. I regeared to 4.56 & got GY MTR 35/12.5-15's a few weeks ago. Much better in terms of gas mileage and drivability. Sayin that, I don't know how much they weigh but she isn't happy stopping quickly....
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