How accurate is the SV speedo?

You can measure the diameter of your wheel and tyre, you know how many mm of tread you had new, you know how many mm of tread are left. You can easily calculate a circumference from a diameter, and convert that into a distance travelled and figure out a number of rotations for a given distance. do it for a knackered tyre and a new tyre and you can easily calculate the difference in speed reading. Personally I can't be arsed.

My vehicles

Pointy SV + 10%
Yamaha XT600 -3% (yes it under reads!)
Seat Ibiza + 10%
Vauxhal Vectra + 5%

[kaivalagi]

Originally Posted by -Ralph-

Personally I can't be arsed.

Me neither that's why I was hoping someone had a idea of the variation....life's too short though

I know for a fact ALL VDO manufactured clocks are factory made with an over read of 5%.
My pointy also over read exactly the same as others have mentioned.

So the question is:

What is the best device to get to enable you to have the most/more accurate reading of what speed you're travelling at?

GPS?

[kaivalagi]

GPS helps you understand but you don't need it after a while anyway

You could go out and buy a Speedohealer? or whatever the equivalent are...
Manufacturer's site here: http://www.healtech-electronics.com/

Or just get used to it and know that 77=70, 66=60, 55=50

Borrow a gps for a ride to check what your bike comes out then you're done

If you go the route of a speedohealer, keep in mind that the Odometer used the speed sensor as well so your millage will end up 9% short of actual.

[kaivalagi]

Originally Posted by sath182

If you go the route of a speedohealer, keep in mind that the Odometer used the speed sensor as well so your millage will end up 9% short of actual.

Mmmmmm, here's a question...Is the odometer accurate or does it also have 9% more than actually ridden as standard?

Originally Posted by kaivalagi

Mmmmmm, here's a question...Is the odometer accurate or does it also have 9% more than actually ridden as standard?

9% more.

I think musne was asking if GPS is accurate, the answer is, for the purposes of measuring vehicle speed to within 1-2 mph, yes it is.

From what I understand, the Odo is mostly accurate. Just the speedo has the over-read. I did a search on google for "speedohealer odometer" and the first few links have statements that follow this line of thought, but I can't find anything hard from Healtech. I was looking into one of these a while back but remember reading that it would make the Odo wrong so I let it go. I like not running out of gas :P

[kaivalagi]

Good to know, the newer dashs are digital rather than the old fashioned wind up things so it would make sense they are accurate in distance and inflated in speed

Personally I think just knowing the differences in actual speed versus what the dash is telling you is enough anyway