Mud-club

Vehicle & Technical => Discovery => Topic started by: MudRat on February 27, 2007, 19:32:29

Title: Speedo Reading
Post by: MudRat 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

Title: Re: Speedo Reading
Post by: redhand 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.

Title: Speedo Reading
Post by: Disco-Ron 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

Title: Speedo Reading
Post by: dazzawhipple 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

Title: Speedo Reading
Post by: davidlandy 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

Title: Speedo Reading
Post by: Guardian. 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!

Title: Speedo Reading
Post by: blackbob 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

Title: Speedo Reading
Post by: Range Rover Blues 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:

Title: Speedo Reading
Post by: Budgie 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

Title: Re: Speedo Reading
Post by: Cassillis 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:

Title: Speedo Reading
Post by: Range Rover Blues on February 28, 2007, 19:36:04

Flattery by speedo, it's a LandRover thing :lol: