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Unread 01-04-2008, 08:14 AM   #1
nofrills
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Speeding ticket question?

I was issued a speeding ticket on my way to work this morning. The cop said I was doing 50mph in a 35. Now when i went by him, I looked at my speedo and it said 40mph. I have 33" tire on the jeep, and it seems like the speedo is off by like 4-5mph.
Is it possible that 33" tires on a stock, 2003 X, speedo gear can be off by as much as 10mph?

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Unread 01-04-2008, 08:38 AM   #2
carr51
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I know that mine is off by exactly 5mph. Ive used the GPS method, had a friend get behind me. I dont know about any more than that. I have 33s with 3.73 gears. 4.0L manual.
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Unread 01-04-2008, 08:49 AM   #3
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Could be a number of things. If you were speeding up, you could have speedo lag. He could have read it wrong. I'd say it was probably right though. Mine's off by about 7-8 mph @ 65mph with GPS, and most speedos are off by 2-3 mph anyway.
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Unread 01-04-2008, 09:07 AM   #4
Jerry Bransford
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If you haven't recalibrated your speedometer, you're definitely traveling faster than your speedometer indicates. Can't say by how much but cops are pretty good at figuring out how fast you're really going. Personally, I generally give the cops the nod in this stuff. In my 45 years of driving, I haven't had many speeding tickets but I never got one that I could have argued with.
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Unread 01-04-2008, 09:35 AM   #5
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Even if the speedometer in your Jeep is off, the burden falls on you to know your correct speed.
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Unread 01-04-2008, 09:51 AM   #6
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I am not planning on fighting it, was more concerned with my speedo gear and actual speed. I mean, 4-5mph off i can deal with, but if it's 10mph off i will change the gear. Thanks for the input guys.
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Unread 01-04-2008, 09:58 AM   #7
SpeedyCat3
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Quote:
Originally Posted by nofrills
I was issued a speeding ticket on my way to work this morning. The cop said I was doing 50mph in a 35. Now when i went by him, I looked at my speedo and it said 40mph. I have 33" tire on the jeep, and it seems like the speedo is off by like 4-5mph.
Is it possible that 33" tires on a stock, 2003 X, speedo gear can be off by as much as 10mph?
My Grand is off 8 MPH at 50 when I get a reading with my GPS. This is with almost 32' tall Mud tires.
You certainly could be close to 10 mph faster than your speedo reads.
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Unread 01-04-2008, 10:01 AM   #8
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Quote:
Originally Posted by Chris_
Could be a number of things. If you were speeding up, you could have speedo lag. He could have read it wrong. I'd say it was probably right though. Mine's off by about 7-8 mph @ 65mph with GPS, and most speedos are off by 2-3 mph anyway.
What I have seen is the other way though...
Most speedos I have checked usually read 2 to 3 miles faster, not slower than actual speed.
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Unread 01-04-2008, 10:16 AM   #9
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Quote:
Originally Posted by nofrills
I am not planning on fighting it, was more concerned with my speedo gear and actual speed. I mean, 4-5mph off i can deal with, but if it's 10mph off i will change the gear. Thanks for the input guys.
Good idea. It's one of the most simple things to do after a lift. There's write ups all over that show how to with pitcures, very simple task. Make sure you get the right tooth count.
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Unread 01-04-2008, 10:58 AM   #10
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Quote:
Originally Posted by speedycat3
What I have seen is the other way though...
Most speedos I have checked usually read 2 to 3 miles faster, not slower than actual speed.
Not once you install bigger tires.
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Unread 01-04-2008, 11:17 AM   #11
SpeedyCat3
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Quote:
Originally Posted by Jerry Bransford
Not once you install bigger tires.
Oh no... I was referring to stock tires.
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Unread 01-04-2008, 11:27 AM   #12
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What's your stock tire height?

And most 'factory calibrated' speedos have an error range of at best +- 3-5 mph. Non 'factory calibrated' may be a bit more. I'm a big fan of GPS'ing my speedo.
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Unread 01-04-2008, 11:49 AM   #13
RAMBOY
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Quote:
Originally Posted by nofrills
I am not planning on fighting it, was more concerned with my speedo gear and actual speed. I mean, 4-5mph off i can deal with, but if it's 10mph off i will change the gear. Thanks for the input guys.


Why not fight it? At least go to court and hope the cop doesn't show so the case is dismissed. Even if the cop shows your fine/points may be reduced.
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Unread 01-04-2008, 11:57 AM   #14
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The local court is across the hall from my office. I have heard all types of pleas and excuses. I have heard the "my spedo must be off" more than once. Every time the judge says the same thing. It is your responsibility to know your speed and the speed limit of the road you are traveling on. If you try to fight it you're not likely to win. The judge will ask to see tuning records for the radar, they will be detailed, current and prove that the radar is accurate. He will then find you guilty and you will not get a reduced points deal. I say pay the ticket and move on with life.
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Unread 01-04-2008, 01:05 PM   #15
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Borrow a GPS to check your speed.
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