Rear Wheel Drive Vehicle, 2 New Tires, Front or Back?

Discussion in 'Community Discussion' started by jaw04005, May 4, 2008.

  1. macrumors 601


    Aug 19, 2003
    I'm getting two new tires for my Mustang. The two back tires are the ones that need to be replaced.

    My dad and grandpa are insisting that I have the tire shop put the two new tires on the front, and move my two good tires from the front to back.

    However, the tire shop disagrees since my car is rear wheel drive. The shop says I need to put the two new tires on the back. They even gave me a guide explaining why good back tires are important.

    Also, several of the tire manufacturers urge you to put your new tires on the back also.

    My tires are still on back-order. Any thoughts?
  2. macrumors 65816


    Feb 1, 2002
    I'd probably go with the people who make their livings studying such things and took the time and expense to print up literature about it.
  3. macrumors G5

    Sun Baked

    May 19, 2002
    Putting 2 tires with the most grip on the front can cause the back end to break loose and the car to spin out in a panic stop.

    Putting the good tires on the rear puts the most grip on the back, hopefully balanced with the front during panic stops.

    At worst the rear grips more than the front the car is being pulled to a stop, and doesn't want to swing around.


    aka, Putting the good tires of the front could make the panic stop a handful as the car gets squirrely.

    Edit: Also forgot to say that most weight + old tires (aka front) = most grip for old tires ... sticking them on the light side of the car takes poor grip tires and makes problem worse, and compounds that in a panic stop when even more weight and grip is removed from the tires.
  4. macrumors G3


    Aug 20, 2003
    sitting on your shoulder
    Well-worn tires generally have MORE grip in the clean 'n' dry than less worn.

    What you need to consider most here is hydroplaning resistance. Deeper tread is better than shallower tread (assuming same model and size of tire). Therefore, you should put the more worn tires at the front, and put the new ones in the back. This way, is you start to hydroplane, you'll understeer, which is fixable by just letting off the gas some. Otherwise, if the rear tires start to hydroplane first, you'll start to oversteer, which, while fun in a controlled environment, is not so fun on a crowded highway.

    Especially when that semi t-bones you...

    Everything you wanted to know about tires, and much much more.
  5. macrumors 65832


    Jan 13, 2008
    well worn tires with less tread are not sticker than new tires with a lot of tread.
    you might think its a slick sports tire or something but real racing tires if there slicks, get to a point where they suck. this is the point where you have no more tread left on the tire.

    sure people shave r compound tires 1/32 or two, but that in no way is making that tire a slick,

    i didn't read what you posted as i am pretty sure im correct and should be doing my homework instead of this.
    hey if im wrong.
    at least you know that is right
  6. macrumors 68000


    Jun 6, 2007
    Birmingham, England
    That is so wrong it's scary. As benlangdon said, a well worn tyre (sorry, using the English spelling) will not have more grip. The slick tyre used by racing teams have a much much softer rubber than a normal road tyre, thus generate more heat which adds to the grip. Any sign of uneven wear or a tread depth of 2mm or less and mine get changed.

    As for the OP, I'd listen to the tyre man and manufacture when it comes to where to stick the new ones.
  7. macrumors 65832


    Jan 13, 2008
    you should get all new
    keep one for the spare (if you have a full size spare, which ford prob skipped)
    and fing rotate your tires
    jesus christ :rolleyes: (as mr slave would say)

    i have 280 tread wear tires
    and i go around right turns a lot more than left turns (well hard turns) everyday and i rotate mine more than normal.

    yet all my tires have equal wear.

    o ya i drive a rear wheel drive car also.

    ya 2nd edit.
    i should mention those people who shave a little do this so they do not have to wear the tire in to get it i guess you could call it tempered, but even then it should go through a heating cycle
    and if they are a any team they would bake there tires before they even touched them, and wouldn't touch them at all.
    im rambiling now
    need sleep

    ya... worn tires are good for one thing
    burnouts, and coffee tables
  8. macrumors 65816


    Jul 29, 2005
    Don't step into the kawoosh...
    The question we should be asking is why do you only need back tires? Of course we know the answer to this question but that is not the point. I realize it is probably fun to do burnouts but you will soon come to realize tires can get expensive quick.

    My opinion is to do what one of the other guys suggested and get 4 new ones. Then use one of the remaining two good ones as a full size spare. Then, stop doing burnouts and screwing up your tires. When you get your tires get them from a place that offers lifetime balance and rotate. I usually get tires from firestone and get the lifetime balance and rotate along with front end alignment package. That way every time i take in the vehicle for an oil change i get the tires balanced and rotated and the front end aligned.
  9. macrumors P6


    Mar 22, 2008
    On tenterhooks
    I'm with your Dad and Grandpa on this one.

    In the wet, I want some tread on the front.

    I am less worried about doing donuts, but then I don't drive in that fashion.
  10. macrumors 65832


    Jan 13, 2008
    kinda forgot about that
    i get one almost every new set of tires.
    on second set this year :( 1600 down the drain
    maybe you have a lot of toe out or in in the back
    that will wear tires down fast.

    o ya get the most expensive tires you can afford.
    tires are the only thing that touch the road.
    what good is a 3k coilover setup with 195/60/15 and a tread of 900+
    just saying.
  11. macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Your dad and grandpa are thinking that if a tire were to blow out you'd prefer it to be a rea tire. In this respect they are correct.

    Also they are thinking about economy. In your car the front tire get "used up" faster and the rear tires will last "forever".

    I think the tire company is thinking about handling and braking performance and legal liabilty. If they place them on the rear and something goes wrong it is less likey to cause an accident.
  12. adk
    macrumors 68000


    Nov 11, 2005
    Stuck in the middle with you
    Why? If it's wet or icy, having tires with better tread on the rear tires will keep your car pointed straight ahead in an emergency stop. Having the front tires grip better than the rears will inevitably cause the rear end to slide out, which is quite dangerous.
  13. macrumors 6502

    Jul 24, 2007
    Stop peeling out if you have warn out your rear tires and not your fronts. How many miles do you have on these tires?

    I think of it this way, your family wants you to put the used front tires on the back because the cost of tires is not cheap. You have proven your going to wear out your rear tires quicker than your front. Your family does not want you to have the new tires wear out before your older front tires do.

    I agree with them.

    The garage wants you to put them on the back, so you will wear them out faster, and buy more from them.

    I agree they are thinking that primarily, and their secondary thinking is not wanting to do more work by moving the fronts to the rear, adding the new tires to the front, and losing money in both manual labor, and you not burning through their tires faster.

    Put the new ones on the front, your car has a majority bias for braking towards the front. And you steer with the front of your car. If your rear tires lock up, ya you could possibly spin out. But if your front lock up, you have no steering, and will spin out.
  14. macrumors G3


    Aug 20, 2003
    sitting on your shoulder
    1.) Hydroplaning is the major issue at hand.
    2) If your rear tires lock, you will almost certainly oversteer if you try to steer, and unless you know how to handle that situation in your car, you're boned.
    3) If your front tires lock, you'll obviously take longer to stop on hard surfaces (not gravel though), and you won't turn at all if you try to steer. This is easier to fix, by letting up on the brake to give your front tires grip again.

    Of course, ABS makes locking under braking moot anyway.

    Now, on to worn vs. full tread tires in the dry. (bold is mine)
    So, nearly worn tire = bigger contact patch, which is exactly what you want in the dry. The rubber is quite as sticky anymore though, but it's better than squirmy tread.

    Quick rank, for dry performance:
    1. Real slick
    2. shaved new tire (shallow tread + fresh rubber, possibly has lubricant on the tread if they used any when shaving)
    3. nearly worn out tire (shallow tread + old rubber, no lube on tread)
    4. brand-new tire (deep squirmy tread + fresh rubber, lube on tread from the molding process. Takes a few hundred miles to remove.)

    Of course, any rubber >>>>>>>>>>> the casing of the tire, so there are obviously limits.
  15. macrumors regular

    Dec 17, 2006
    when i had my car running (350+hp rearwheel drive tbird) id go through 2 sets of tires a summer, i usually run a different size tire in the front vs the rear so i always put the new set on the rear. ive gone about 8:2 rear:front tires. put them on the rear.

    what tires are you putting on the stang?
  16. macrumors 6502a

    Aug 28, 2007
    I assume they are all the same size tires? Why not just all four?
  17. macrumors G3


    Aug 20, 2003
    sitting on your shoulder
    Well, if two are still over 5/32" or so of tread depth, there's no reason to replace it unless you have monsoons every week.
  18. macrumors 65832


    Jan 13, 2008

    are you kidding me?
    did you get this from personal experience or actually something viable, and not just from what you think.

    i am not saying i am right. hell someone correct me cause i would like it right.

    lets say this.
    a "racing slick"
    is not better than a coarsely treaded tire.
    it depends on the actual rubber not the tread.
    formula one, somewhat of a tread.
    formula 3000 or something (its very low powered car used for getting higher up in racing and learning) has a slick. and it defiantly not sticker than the treaded formula 1 tire

    my last set of tires.
    where really sticky when i got them
    half way through, they dropped off a cliff in terms of stickiness.

    will be worn off if you go around a couple turns somewhat hard.
    this "lube" is not from the tire company, its from the tire selling company trying to make it look nice.
    again, i have done this. i tried seeing how good the tire was first day i got it. it understeered and oversteered a few times, thats it. a few times, in one day.

    to be honest i have no clue why people shave there tire, i know in drag racing the clean it but do not shave it.

    when the do shave a tire, or cut more tread into it they cut it they do not shave it, there is no lubrication.

    haviing less tread does not make a tire better as already stated.

    and this worn tire = bigger tread patch.
    this might, if it does or not correct me
    changing from a 225 to a 235 tire is 10millimeters, now a 225 might go into a 226 if it happens, but do you know how much a millimeter is?
    ten bucks says you can not tell a difference between the same wear rating on a tire from 225 to 235, experience will tell you but if your a novice i highly doubt it you will be able to tell, and if you were a pro, you would not be saying, shaving a tire gets fresh rubber. its all the same age. graining might happen, but that is on very very expensive tires that wear out very very quickly and are definatly not street legal, and then you need to just not push on the tire so much and it will go away.

    i wish i could have made that really clear and informative, but i am tired, and still in the middle of finishing a research paper

    i was just so taken that you might actually believe what someone will say on here
    im not saying you should believe me, joe blow, or schumacher
    just wanted to help, well sort of

    side note. you will envitably be replaceing those worn out ones
    so who gives a f$*(
    where do you live anyway.
    this hydroplanning c*$( can be solved one way and should be solved this way, go slow you *$(#, its raining.
  19. macrumors 6502

    Aug 15, 2003
    Putting the new tires in the back will give the car a tendency to understeer, which is safer for most drivers. That's probably why the shop wants to do it.

    Putting the new tires in the front will cause oversteer, which is more difficult to control but a lot more fun. This is what I would do.
  20. macrumors G3


    Aug 20, 2003
    sitting on your shoulder
    That lube IS from the tire company so that it doesn't stick to the mold while it cures.
    Shallower tread = less tread squirm = better response to inputs
    It's not gaining width when it wears, but when the tread depth is nearly gone, the rubber at the bottom of the tread grooves starts coming in contact with the road surface.
  21. macrumors 68000

    Jan 14, 2007
    I would take the professional opinion. It sounds logical to me.

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