I know they are very similar in diameter but the 265s are alot wider, I would probably run the 235s up front and the 265s in the back. Does anyone see a problem with this? Has any one did the same thing? If you are wondering why I would do such a thing I am getting the tires for free vs almost a 1000 newand I am cheap
I won't say "can't", but shouldn't be done; and will cost you more than 1G to fix when you blow out your t-case, or tranny down the line. You aren't even supposed to run a spare on a full time 4wd more than 1 tire size off. Risky proposition.
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"In certain places, at certain hours, gazing at the sea is dangerous. It is what looking at a woman sometimes is." - Victor Hugo
Originally Posted by Elemental
Some guys play hard to get, I play hard to want.
Ya good call XM, I am am not sure the actual difference in diameter between the two. Would it be bad if I went with two used tires and two new of the same size to offset the cost of four new?
if it's for only little while and you don't lock the transfer case then the open diffs should pick up the slack. i do not recommend you doing this however.
If you were asking an AWD vehicle I would say absolutely no. The problem you run into is the different sized tires making different numbers of rotations. With an all time 4wd vehicle you run into issues with the t-case, and with all vehicles (on the drive axle) you run into issues with the diffs if you run 2 different sized tires. Here is the math when I was comparing tread differences on used 34x9.5 TSLs. For reference the 34.31" is the used tires I am running on the front of my truck, and 34.81" was the tread when my rear tires were new. 4.625 is my gearing in the diffs.
34.31 x pi = 107.8, 63360 / 107.8 = 588 revs per mile, 588 x 4.625 = 2720 rpm drive shaft speed
34.81 x pi = 109.4, 63360 / 109.4 = 579 revs per mile, 579 x 4.625 = 2678 rpm drive shaft speed
2678 / 2720 = 0.98
579 / 588 = 0.98
If plug in your gear ratio you can find out the exact numbers, but the point is I was comparing 1/2 an inch... you are only talking 1/10 of an inch. The drive shafts will be making the same amount of turns, so there won't be any damage to the T-case or Diffs. BUT in my situation I am running a part time 4wd truck. I only have anything to worry about when I am wheeling. If you leave the t-case diff unlocked (center diff lock) you will minimize the risk but there is still that risk seeing you have full time 4wd. It boils down to do you want to take the risk, even if it is minimal?
If it's a finance thing, but you need good tires; your best bet would be four used from a reputable used tire shop. Get the size you want, four matched tires, same size, and same tread wear. If you can afford two new now; you can afford four used with 2/3 to 3/4 tread. Then save up for four new ones at a later date. You may find you want to go even bigger if you improve lift, or mods down the line.
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"In certain places, at certain hours, gazing at the sea is dangerous. It is what looking at a woman sometimes is." - Victor Hugo
Originally Posted by Elemental
Some guys play hard to get, I play hard to want.
Don't even consider doing that, your t/case and spider gears will pay the price.
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Mike
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
I took a couple minutes and plugged in the numbers for the Disco:
31.70 x pi = 99.5, 63360 / 99.5 = 636 revs per mile, 636 x 3.54 = 2251 rpm drive shaft speed
31.60 x pi = 99.2, 63360 / 99.2 = 638 revs per mile, 638 x 3.54 = 2258 rpm drive shaft speed
2251 / 2258 = 0.996
579 / 588 = 0.996
So the spider gears and the t-case gears will be spinning off by .004 . Less than what mine are (.02) by far, with no problems. But I would wait and save up to buy all the same size tires if possible even if you could technically run them. It is better to be safe than sorry.
Thanks for taking the time to do the math, I guess I will just have to save for a matched set.
When will some people on this forum start to think. As soon as you mention something outside the norm they all come up with stupid reasons why you should not do it.
You are talking about a 0.3% difference in tyre size. It is not going to have any impact on your transfer case or traction control. These same people that are telling you not to do it are running different tyre pressures in the front tyres compared to the back. These differences in tyre pressures will have more of an impact that the difference in size that you are talking about.
By these people responding, please make sure that you only ever drive in a straight line as you will blow up your transfer case if you turn a corner and some wheels travel further than others. What bullshit.
But what you need to check out is the actual size of the tyres rather than what is printed on the side. Look up the manufacturers website and look at the actual specs. They should list the actual rolling diameter, revolutions per mile, or something similar.
LOL. The only thing in this thread that is stupid is you, if you were the sole representative of your country I would think the same about Americans. Who really cares what you think. Calling me a pussy from your keyboard must make you feel pretty tough Please don't reply to this, I have no interest in arguing with a retard over the Internet.
Thanks for the input, I don't think a 0.3% should be a big deal. I think I will measure the tires myself and see how close they are. If they are not close I will get two new 265/75s and mix them with two used ones of the same size.
I say do it! Then yer get's yerself a can of that rattle can primer from Autozone, red or gray, don't matter no how what color yer pick. Then yer paints up yer truck and it'll look like one of them Cheby Nova's driving around town...
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It just doesn't matter.
Quote:
It's not like I am going to do this without asking my mom first.
Thanks for taking the time to do the math, I guess I will just have to save for a matched set.
"OH Geez eh, don't doit, ya for sure eh."
It will mess things up. this worked in the seventies with our hot rods but not awd. I wouldnt even mix brands the same size.
You can find a cheap, but good, used matched set on Craig's List or Ebay. I have done it for years. I have never paid retail for a tire, just won't do it.
You laugh, but I just bought a brand new ome in the box front fender cover for a 99 DII for $75 on CL. That item is over $1000 at the dealership.
I have a brand new set of Goodyear Wrangler HP 255 55 18 I will sell for $550.00 plus $80 for shipping you will save over $300 ....
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Can you run 235/85 and 265/75 on the same truck
and I am cheap
Please don't reply to this, I have no interest in arguing with a retard over the Internet.
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