Williams Speedo Accuracy

[J_A_R_B]

Hi All


I often get concerned when going through speed cameras that people driving visibly faster and slower and wondered those with GPS how accurate the williams speedo is.

[northy]

My one was around 3mph out mate on my GPS.

[J_A_R_B]

Thanks northy just get bit worried when see people going loads slower through cameras especially as speedo needle bounces a bit (sounds daft).

[Andyvalver]

People always worry about speedo's reading a higher speed than your going, but can they work the other way? Actually read a slower speed? So when your speedo says its doing 90 you could be doing a 100?

[J_A_R_B]

Having done a bit or reading legally they have to read higher than your actual speed 0-10% margin

[Zollo]

Mine's only a couple of MPH out according to my sat nav. Most accurate speedo I've compared the sat nav too, as it happens

[Swervin_Mervin]

10%. Trust me I used my last employer's speed gun to test the local flashing speed sign. :P

You could go through a camera doing an indicated 45 no trouble.*







*DISCLAIMER - In no way will I be held responsible if you do and your speedo's more accurate than mine.

[Purple]

Tyre size, make and model plays a part in the accuracy as well. Even different tyres of the same rated size can have slightly different rolling distance.

[Craig]

many factors make a difference, but generally at 30mph, usually about 3-4mph out. the faster you go the more they are out!

[Martin]

Mine is 2-3mph out at 100mph using pod timing.