SOHC.co.uk Forums > CB350/400

Speedometer speed vs GPS speed

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Bryanj:
I have never yet found a speedo that is accurate and also not one reading low, it used to be a speedo had to be + or - 10% but i believe the - limit has been removed so you cant use it as an excuse

Mikep328:
"One thing though, the red zone on the new tacho has faded very quickly!  :o It's new in the pic, but now it is as faded as the original, maybe it is meant to?"

Mine is doing the same. :(

Spitfire:
When I first got my F1 on the road I followed my wife through Liverpool, she was in the car and sshe cared me to death with how fast she was going.
as the place has lots of speed cameras.
I was watching my speedo like a hawk, she seemed to be way too fast.
So when we got home we checked my speedo against the car speedo at various speeds, the car was a new Ford Kuga so the speedo was probably a lot more accurate that my 1970's Honda one.
It turned out that mt speedo was 7 mph fast at all speeds, at least it was consistant.

Cheers

Dennis

TrickyMicky:
Over the years, vehicles, (2 or 4 wheels), that have had many owners, may well have been modified/customised including a change in wheel size, or different profile tyres. All of this will affect the speedo reading. We are not too badly off with our bikes, as the speedo runs off the front wheel, but even here, modern tyres may have slightly different rolling radius. Cars were/are a problem when owners changed gearboxes and final drives.  As someone mentioned earlier, to the best of my knowledge, a satellite system will monitor in a straight and level line, and not account for going up or down hills.  If you feel brave or cheeky enough, you could ask your local friendly ;police traffic pfficer or motorcyclist to follow you for short periods at set speeds. 

Bryanj:
Follow an english hgv on the motorway, speed limited to 90kph(56mph)

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