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Speedometer with bigger wheels and tires

Discussion in 'Wheels & Tires' started by Kiko, Feb 16, 2015.

  1. Feb 16, 2015 at 6:17 PM
    #1
    Kiko

    Kiko [OP] New Member

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    Hey guys. I'm putting 33x12.5R20 wheels and tires on my 2014 tundra. I know that it will affect the speedometer and mileage . Any suggestions on how to fix that?

    Thanks
     
  2. Feb 16, 2015 at 7:14 PM
    #2
    Virgils12

    Virgils12 New Member

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    Camburg Fox factory 2.5" lift Xd monsters with 295/70/18 nitto terra graplerrs Corsa cat back Weather tech liners Wet okole covers
    I think the hypertech chip or programer fixes it.
     
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  3. Feb 16, 2015 at 7:45 PM
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    T-Rex266

    T-Rex266 .org? Never heard of her. Staff Member

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    The hypertech can fix it.

    ImageUploadedByTapatalk1424144739.525407.jpg
     
  4. Feb 16, 2015 at 8:37 PM
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    csuviper

    csuviper Moderator Staff Member

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  5. Feb 17, 2015 at 9:03 AM
    #5
    Relentless

    Relentless Eric @Relentless Fab Vendor

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    I doubt it'll be more than a couple mph off. On my '14 I did 295/70/18's (nitto spec's 34.6") and I'm about 5% off.... 2mph around 40mph, and about 3-4mph off on the freeway. I would check your speed with a gps after installing the tires before spending the money on the hypertech speedo calibrator.
     
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  6. Feb 17, 2015 at 9:25 AM
    #6
    chphilo

    chphilo Tundra addict

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    I wouldn't worry about recalibrating speedometer with 33 inch tires. From what I read, your speedometer becomes more accurate with 33 inch tires than with stock 32 inch tires.
     
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  7. Feb 17, 2015 at 11:01 AM
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    scratchex

    scratchex New Member

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    Would you need to going from 33's to 35's?
     
  8. Feb 17, 2015 at 1:46 PM
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    chphilo

    chphilo Tundra addict

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    Yes. Your speedometer will be substantially off with 35. For some reason, vehicles are set so the speedometer reads faster speed than the actual speed. It may have to do with law suits, but I am not sure. For Tundras, 33 seems to be almost spot on with gps speed reading.
     
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  9. Feb 17, 2015 at 2:19 PM
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    Virgils12

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    With my 35's I'm off 3-4 mph.
     
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  10. Feb 17, 2015 at 2:41 PM
    #10
    Relentless

    Relentless Eric @Relentless Fab Vendor

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    Cant hurt, see my post above.
    Yeah, it's actually a percentage so at low speed it's nearly correct and the faster you go the more mph the gap is from what it should read. On mine it's 3-4 on the freeway (70mph) but only like 2 mph in town (around 35-40mph)
     
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  11. Feb 17, 2015 at 3:46 PM
    #11
    Virgils12

    Virgils12 New Member

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    This is probably right just never checked it in town before. ^^
     
  12. Feb 17, 2015 at 5:29 PM
    #12
    T-Rex266

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    That changes with speeds

    Take it from someone who was stopped 90+ In a 75 from CSP ...no cite though.
     
  13. Feb 17, 2015 at 5:30 PM
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    T-Rex266

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    A good way to find out is to find one of those portable radars where it displays your speed...or know some fellow LEO friends that'll use a radar or laser to measure Ur MPH :cool:
     
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  14. Feb 17, 2015 at 5:57 PM
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    Virgils12

    Virgils12 New Member

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    There are plenty of speed apps to download on your smartphone also. The one I use is speed box.
     
  15. Feb 17, 2015 at 6:41 PM
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    Relentless

    Relentless Eric @Relentless Fab Vendor

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    Yes, like I said it's a percentage difference not fixed like some believe it to be.
    Mine as an example seems to be off 5%(verified w/ GPS app) so in calculations......

    Reads----------Actual
    20 mph x 105% =21mph
    30 mgh x 105% = 31.5mph
    40..... 42mph
    50...... 52.5mph
    60..... 63mph
    70..... 73.5mph
    80..... 84mph
     
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  16. Feb 18, 2015 at 1:06 PM
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    JMB

    JMB Not new, just a little old.

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    Here's a pretty handy calculator.

    http://www.tacomaworld.com/forum/tirecalc.php

    Hypertech will work, or some shops will calibrate. We have a guy local that will calibrate and provide a notarized statement as to how far off it was. Can get speeding reduced to improper equipment.
     
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  17. Feb 20, 2019 at 7:39 AM
    #17
    r1-superstar

    r1-superstar Kailua Boy

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    This is another reason I didn't go with 295/70-18 for my application.

    OEM size - 275/55-20, the 295/70-18 would put my speedo at a difference of 8% on average. This is a 2.4" difference in tire height, possibly needing a speedo recalibration.
    OEM size - 275/55-20, the 305/65-18 would put my speedo at a difference of 4% on average. This is a 1.4" difference in tire height, perhaps not needing a speedo recalibration.

    The 275/65-18 tire found on the Off-Road models are is 1/4" taller than my 275/55-20 found on my Sport.
     
  18. Feb 20, 2019 at 7:59 AM
    #18
    JoshuaA

    JoshuaA Canuck Member

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    As it takes a longer rotation to reach 1 full turn going from stock to a larger tire, I believe % difference higher in circumference is % difference slower on speedo. The bonus your odo is adding up slower too. So if it looks like you are going the max speed limit, you will be speeding according to radar traps.

    Hypertech calibrator is the dash fix. GPS based speed app on a mounted smartphone is the cheap fix. Guys with android HU's of any sort can install home screens with GPS based speedo.
     
    r1-superstar likes this.

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