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When do tire size differences cause problems?

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  • When do tire size differences cause problems?

    I've been lucky and wear out tires four at a time. My two kids, not so lucky. Each have lost one tire from a set of half worn tires and replaced with a new tire.

    My worry is rotating the newer tire to the drive axle and overworking the differential bevel pinions/shafts from two different size tires. Is this a problem?
    '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

  • #2
    As long as the ruined tire is being replaced with one of the same brand, size and model... I don't see a concern. Tell 'em to stop running over pointy things
    John and Linda
    Long Island, NY
    Escapade III
    1992 Carver 26 Command Bridge
    Twin Merc Alpha 4.3 'Gen +'

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    • #3
      Originally posted by harringtondav View Post
      I've been lucky and wear out tires four at a time. My two kids, not so lucky. Each have lost one tire from a set of half worn tires and replaced with a new tire.

      My worry is rotating the newer tire to the drive axle and overworking the differential bevel pinions/shafts from two different size tires. Is this a problem?
      What kind of cars and what type of drivetrain do they have in them? I know in my wife's Subaru, the AWD system is not tolerant of different sized tires much because of the way the coupler in the system senses slippage.

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      • #4
        AWD cars require the tires on all 4 corners to be the same with minimal difference.
        4x4 vehicles with limited slip differentials or quaife differenteials require the 4 corners to be the same with minimal difference.

        typical FWD and RWD cars without limited slip or quaife differentials do not care one way or another if any tire is different

        two wheel drive cars with limited slip or quaife differentials do not care if the font is different than the back, however do need the right/left to be the same
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

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        • #5
          Originally posted by MTboatguy View Post

          What kind of cars and what type of drivetrain do they have in them? I know in my wife's Subaru, the AWD system is not tolerant of different sized tires much because of the way the coupler in the system senses slippage.
          One is a Neon frt wheel drive 5 speed stick. Other is a Sebring frt wheel drive auto.
          '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

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          • #6
            Both one-wheel wonders. no problem
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
              Originally posted by Scott Danforth View Post
              Both one-wheel wonders. no problem
              Yes Scott. But my concern is the side gear/pinion mesh is working 100% of the time vs. just in turns and curves. Not sure if it was designed to take that kind of use. Most auto diff. pinions and some side gears are compacted sintered powdered metal. Not cut gears but more like Cogswell cogs.
              '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

              Comment


              • #8
                Sign up today
                the difference between a new tire and a used tire or between two tires the same size and wear, however one 10 psi different from the other is what the differential is for

                your over-thinking it in this case, especially with the sloppy diffs in the MOPAR front drivers.

                I can tell you from personal experience for 100,000 miles I beat the manual trans on the PT cruiser (same as the Neon) and that included the occasional new tire to replace a damaged one. when I took the trans apart (part of the shift detent mechanism dropped and got pushed thru the case by the ring-gear), the diff was fine, I actually drove the car 20 miles without oil in the trans.

                the diff is the low-point and fully oil-bathed. no problem with one new tire and one bad. however if it bothers you, put them on the back.
                Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                Past Boats
                1970 Wooster Hellion - Merc 9.8
                2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                What’s behind you doesn’t matter.Enzo Ferrari

                Comment

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