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Bigger tires?

Discussion in 'Trucks and Trailers' started by qualitylawnmanagement, Dec 15, 2006.

  1. qualitylawnmanagement

    qualitylawnmanagement LawnSite Bronze Member
    Messages: 1,000

    I am running 285's on my truck and was wonder how much that set off my speedo?
  2. qualitylawnmanagement

    qualitylawnmanagement LawnSite Bronze Member
    Messages: 1,000

    anyone? I need to because I got speedy ticket and I need to know before I go to court.
  3. KrayzKajun

    KrayzKajun LawnSite Fanatic
    Messages: 10,737

    maybe set you off by one or two mph, i upgraded to a 36" tire and it offset my speedometer by 7mph, so when it says im doin 30 im really doin 37
  4. charmill26

    charmill26 LawnSite Senior Member
    Messages: 369

    i may have read somewhere 5-8% or so. im pretty sure that was for the 285s. i know here in omaha if you get a ticket and you had bigger tires put on the truck than the stock ones you can get out of the ticket i believe. you just have to go get your speedometer reset and show it to them i think?
  5. Josh.S

    Josh.S LawnSite Bronze Member
    Messages: 1,085

    Well the only thing I think is to find the circumference of your tire, find the circumference of the stock tires, and subtract the difference. Put the difference into percent, and that would be the percent that your speedometer is off.

    By the way, how fast were you going in what zone? and on what rode?

    I got a speeding ticket on cable rd near walmart for 52 in a 35, my speedometer was off but I knew I was speeding so I just went to the JDC, signed the waiver and paid the ticket...

    That is what I suggest you do, and it might not even get back to your insurance (mine didn't), plus no court costs...
  6. smalley360

    smalley360 LawnSite Member
    Messages: 48

  7. mosmgras

    mosmgras LawnSite Senior Member
    from NC
    Messages: 270

    New tire diameter divided by old tire diameter = percentage of change.


    New tire 33" diameter, old tire 30" diameter:

    33/30= 1.1 - that translates to 1.1 times whatever your speedometer says.

    In this case, speedo says 60 mph, you're traveling 66 mph.

    Hope this helps.
  8. qualitylawnmanagement

    qualitylawnmanagement LawnSite Bronze Member
    Messages: 1,000

    Well I figured it out, It is 6 mph difference, so when I was doing 50mph it showed I was 56. I was on my way to the pub heading on breeze not the 35mph zone but heading away from Shawnee, and my radar detector was going off so I didn't do anything cause I was thinking it was picking up a senors at a store so I kept't going and all of sudden I see a cop so I slam on my brakes and he clocked me doing 58mph in a 45mph so he pulled me over. Well from my accident I got a ticket for not staying assured clear distance, and this is my second ticket so I lost them for 3 months. What makes me mad is cop do this stuff by stores so people with radar detectors think it a sensor in the store and the clock you for speeding when you think it isn't a cop.
  9. qualitylawnmanagement

    qualitylawnmanagement LawnSite Bronze Member
    Messages: 1,000

    Well thanks alot. It did help me out.
  10. qualitylawnmanagement

    qualitylawnmanagement LawnSite Bronze Member
    Messages: 1,000

    Well here is my solution for cheating my way out of ticket, I am going to get a set of 305 tires from my buddy so it puts it 10mph more then my speedo would of said 50mph and I really would of been doing 60mph so if I can get it fixed and take the papers to the judge and show my a 50 in a 45 I think I should be clear. This is what one of my Buddy's who is a cop and told me to do this.

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