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AuthorTopic: Speedo Reading  (Read 727 times)

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Offline MudRat

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Speedo Reading
« on: February 27, 2007, 19:32:29 »
I have 265 75 16s, at 70mph on my speedo whats my actual speed and also at 30mph, cheers
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Offline redhand

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Re: Speedo Reading
« Reply #1 on: February 27, 2007, 19:41:11 »
Quote from: "MudRat"
I have 265 75 16s, at 70mph on my speedo whats my actual speed and also at 30mph, cheers


Varies from Vehicle to vehicle. All speedo's are out by a few MPH one way or the other. If you've got a sat nav that'll tell you exactly how fast you're going.
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Offline Disco-Ron

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Speedo Reading
« Reply #2 on: February 27, 2007, 19:45:59 »
As long as you know what the original tyre size is, you can work it out here.
http://www.tyresave.co.uk/tyresize.html
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Offline dazzawhipple

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Speedo Reading
« Reply #3 on: February 27, 2007, 20:47:23 »
I have a little excel sheet to do that just need to add it to a website page!!!!

PM sent
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Offline davidlandy

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Speedo Reading
« Reply #4 on: February 27, 2007, 20:49:46 »
theres one on my webpage http://www.yellowstrap.com/   its about two thirds of the way down on the left hand side
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Speedo Reading
« Reply #5 on: February 27, 2007, 21:20:07 »
i have same tyres, bf muds, and at 70 on your clock you are doing 80mph, and 30 on your clock you are doing 34mph.
i checked it out so i didnt get nicked at the speed cameras!
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Offline blackbob

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Speedo Reading
« Reply #6 on: February 27, 2007, 22:07:38 »
borrow a sat nav and watch the speed readout my disco has standard tyres and the speedo is out by about 4mph
so 34 is act 30mph
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Offline Range Rover Blues

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Speedo Reading
« Reply #7 on: February 28, 2007, 13:21:02 »
I've got 235/85 BFg M/T and my speedo is spot on according to my sat-nav :roll:
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Offline Budgie

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Speedo Reading
« Reply #8 on: February 28, 2007, 13:48:21 »
If you want to correct it then have a word with Ashcrofts. They may have a speedo drive gear that will do the job for you.  :wink:

According to my Garmin GPS, with 33" tyres, a Defender 1.41:1 ratio transfer box fitted and the standard Disco speedo drive gear, it's only reading 2 mph slow.  :D
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Offline Cassillis

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Re: Speedo Reading
« Reply #9 on: February 28, 2007, 19:26:19 »
Quote from: "MudRat"
I have 265 75 16s, at 70mph on my speedo whats my actual speed and also at 30mph, cheers


I run the same size in M/Ts on the pig and my speedo is spot on with the tomtom amazingly :shock:  :shock:
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Offline Range Rover Blues

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Speedo Reading
« Reply #10 on: February 28, 2007, 19:36:04 »
Flattery by speedo, it's a LandRover thing :lol:
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