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Bigger tires CORRECTED my speedo...

Discussion in 'Wheels & Tires' started by Scott88, Apr 12, 2010.

  1. Apr 12, 2010 at 9:32 AM
    #1
    Scott88

    Scott88 [OP] Member

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    Scott
    North Texas
    OEM Intermitent wipers, OEM fog lights, PNL on tailgate, Cruise Control...
    Am i alone, or has this happened to anyone else.
    I needed new tires on my 5 lug, 2.7L base truck, and decided to go with actual truck tires (235/75-15) rather that get the go-kart tires that came from the factory (215/70-15).

    I had noticed from the day I bought the truck that the speedo actually read faster than I was traveling, but didn't worry about it too much.

    Now that I changed to much bigger tires (2 inches larger in OD) the size calculator said I'd be off by around 5mph.

    I've checked with 2 different nav units, and the speedo is dead on with the new tires.

    So... has anyone else seen this??
     
  2. Apr 12, 2010 at 9:35 AM
    #2
    steve o 77

    steve o 77 braaap

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    makes sense. Larger tires make the speedo read slower than smaller tires. I plan on correcting my speedo with some 265/75/16's because my scangauge showed me my speedo is off 3mph at 70.
     
  3. Apr 13, 2010 at 3:44 AM
    #3
    surfrat

    surfrat Well-Known Member

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    icon coilover, total chaos UCA, allpr expo, icon 2.0 rear,wet okole
    same happend with my FJ...with 285's it was dead on
     
  4. Apr 13, 2010 at 8:20 AM
    #4
    David K

    David K Well-Known Member

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    All three of my OR Tacomas the speedo read more than I was actually traveling, all three with stock tires (265/70-16)... ie. If it indicated 70 mph, my GPS would show me about 67 mph... just like steve o 77 says. The 265/75s are nearly an inch taller... hmmm!???
     
  5. Apr 14, 2010 at 9:08 PM
    #5
    accrete

    accrete The WET! Coast of Oregon USA

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    I swapped out the stock 265/65r17 on our 07 4x4 Taco TRD with 245/75r17 and the speedo is now spot on 60=60 : ) and the new size fills the wells nicely with stock Sport suspension.


    [​IMG]
     
  6. Apr 15, 2010 at 1:33 AM
    #6
    Manlaan

    Manlaan Well-Known Member

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    I think it has to do with fed regs requiring a speedo to never display slower than actual speed from the factory, so they give a little leeway to be on the safe side. Anyway, thats the explanation I've heard about it.

    Mine is still a tiny bit fast (like 2-3mph at 70) based on GPS readings with 265/75/16.
     
  7. Apr 15, 2010 at 1:42 AM
    #7
    ColtsTRD

    ColtsTRD .....

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    Larger tires mean less rotation to go the same distance. Glad it worked out for ya man :)
     
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