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Thread: Is anyone using a 125/80/16 spare?

  1. #1
    Join Date
    Feb 2009
    Location
    Charlotte, NC/Denmark
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    My Cars
    2K Z3 2.8

    Is anyone using a 125/80/16 spare?

    Well, the stock size 125/90/15 tire seems to be extinct. You can go without spare, put on your 17 year old donut and cross your fingers, or buy another (old) one off eBay and THEN cross yoru fingers.

    BMW part # 36116750006 is for a 16" rim and with the Kumho spare tire in size 125/80/16, that lands the dimensions about as close to identical as possible.

    After inspecting my donut. I'm not going to put it back in!

    I'm thinking about pulling the trigger on this setup. Is anyone running it?

    125/90/15
    Diameter: 23.9"
    Width: 4.9"
    Sidewall: 4.9"
    Circumference: 74.9"
    Revs/Mile: 846


    Replace with: 125/80/16
    Diameter: 23.9"
    Width: 4.9"
    Sidewall: 3.9"
    Circum: 75"
    Revs/Mile: 845
    Zed's dead baby. Zed's dead.

  2. #2
    Join Date
    Aug 2015
    Location
    Denver, CO
    Posts
    3,444
    My Cars
    1999 Z3M, 1999 2.8 Coupe
    Hmm, sounds like a great alternative. ~$90/tire and ~45/wheel plus install.

    A 15" (or 16") wouldn't fit over my front Coupe brakes, so if I ever got a flat in front, I'd have to put a rear wheel on the front and the donut on the rear. But, not sure how I'd accomplish that as I don't carry jack stands in the hatch. Or, is the offset such that the brakes don't run inside the rim?

    Thankfully my AAA membership is up to date.
    Last edited by s8ilver; 11-28-2018 at 11:49 AM.
    Nathan in Denver

    1999 M Roadster, VFE V3 S/C, Randy Forbes Reinforced, Hardtop, H&R/Bilstein, Apex PS-7, Supersprint
    1999 Z3 2.8 Coupe, Headers, 3.46, Manual Swap, H&R/Koni, M Geometry/Brakes, M54B30 Manifold, Style 42

  3. #3
    Join Date
    Feb 2009
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    Charlotte, NC/Denmark
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    See .... that's why I'm back and forth on it. I have AAA also, and don't really plan on taking this car further from the house than can be towed.

    That being said ... there is that space underneath where you CAN indeed put a donut, so why not have one.....
    Zed's dead baby. Zed's dead.

  4. #4
    Join Date
    May 2015
    Location
    Maryland
    Posts
    189
    My Cars
    1998 M Roadster
    Wouldn't the Kumho T125/80D15 work on your original rim? It is smaller in diameter at 22.9in but it is a spare for short term use. I have a M so no spare tire problem, all AAA.
    Last edited by Adker; 11-28-2018 at 08:59 PM.

  5. #5
    Join Date
    May 2015
    Location
    Maryland
    Posts
    189
    My Cars
    1998 M Roadster

  6. #6
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,462
    My Cars
    36 Cylinders
    On the newer cars they make an alloy 5 spoke 17", 4" wide ET5 for 135/80R17 tires. I wonder if it would fit?


    http://www.realoem.com/bmw/enUS/show...diagId=36_1274
    Last edited by 328 Power 04; 11-29-2018 at 02:32 AM.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  7. #7
    Join Date
    Feb 2009
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    Charlotte, NC/Denmark
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    The spare is already smaller than the full size wheel. I just don't feel very good about putting an even smaller tire on there - especially if it's the rear!

    I put air in my donut and disconnected that "check pressure here" hose which just doesn't seem like it would help the matter.

    At 18 years old - I'm not sure how much faith I have in it though.

    That alloy spare looks cool, but does not appear easy to get a hold of and I wonder if it costs an arm and a leg.
    Zed's dead baby. Zed's dead.

  8. #8
    Join Date
    Sep 2018
    Location
    Alexandria, VA
    Posts
    50
    My Cars
    2000 BMW Z3
    So did you try it? My 15 in spare is questionable and considering the 16 in with Kumho tire myself.
    Steve
    Alexandria, VA
    2000 BMW Z3 Roadster 2.8

    2020 BMW 230ix (Convertible)
    2015 MINI Cooper S (Convertible)
    2015 Jeep Grand Cherokee Limited

  9. #9
    Join Date
    Feb 2009
    Location
    Charlotte, NC/Denmark
    Posts
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    My Cars
    2K Z3 2.8
    I haven't done it yet, although I still intend to.

    My Z had a "dubious" stereo install done by a PO and in a moment of weakness I had ordered a giant box of stuff from Crutchfield, so I am forcing myself to finish this before I tackle other areas.
    Zed's dead baby. Zed's dead.

  10. #10
    Join Date
    Jun 2016
    Location
    Montreal
    Posts
    49
    My Cars
    2000 BMW Z3
    Anyone try the 16inch upgrade? Curious if its going to fit in the 15inch carrier.

    Sent from my SM-G950W using Tapatalk
    Last edited by iDaKRO; 04-20-2019 at 02:00 AM.

  11. #11
    Join Date
    Oct 2016
    Location
    Ambler, PA
    Posts
    260
    My Cars
    2000 BMW Z3 Coupe
    I just roll with fix a flat. Its never not worked for me. Unless you really destroy your whole sidewall it will work in most cases. No point in trying to find a wheel that would work when I can buy a 10$ can, and its not like my car has TPMS sensors to ruin so the tire can be plugged if possible

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