Hi there, would anyone happen know why my 08 Bandit 650's speedometer is showing more MPH than the bike is actually doing? At 70mph it is showing about 75mph on the gauge, not sure what it is at other speeds. Is this something that can be checked at home or in a garage and fixed? Many thanks for your help. Kam
Speedometer faster than should be on Bandit
Posts 16 | Views 46
Could be different sprockets fitted to give it more bottom end.
What mileage has it done and is it an import?
Governments way of slowing you down
My new bike, car & van all read faster than the actual speed you are travelling at. I'm convinced it's a way of reducing traffic speeds by stealth. I just drive at an indicated 63 now instead of an indicated 60 to compensate.
There's never enough time to do it right but there's always enough time to do it twice.
Speedo over-reading is perfectly normal. They are usually up to 10% out.
They can over-read by a LOT more, when you're in the pub, bragging about your top speed runs. Especially if you're a teenager and there's totty in the vicinity
its showing 75 on the gauge" - how have you measured this?
As Jaffa - maybe you've got different sprockets from standard which would throw it out a bit. How worn are your tyres? Many speedometers have an in-built "tolerance" to account for wear.
Jaffa, it's done 22k and bought in the UK.
AdieR, I measured the difference by asking a mate to drive his car at a constant 70mph for a while (assuming his speedo is ok!).
Tyres are not worn, the front has been recently changed and the back has got plenty of thread in it.
Is it always MORE mph than actually going or does it vary? Would be rather worrying if it could go either way (I here have speed cameras in mind).
My K8 Bandit
on standard gearing is about 10% out as eatcs01 says, measured from the sat nav.
Just count the number of teeth on the front/rear sprockets,as said it`s just under 10% out the right way for you.
Can it be tuned to be accurate?
are that you mates car is out also.
arn't police cars callibrated? Not sure, mabey google that one.
The only way to correctly gauge your speed is to time it over an exactly known distance. There are "measured mile" markers on the road here and there, you need to time it, work out your average speed over that mile, then compare it to what you recall the speedo reading during that time.
Measuring it against anything else depends on that instrument's calibration being accurate - which it usually isn't. Manufacturers tend to err on the side of an overestimate, arguably to reduce the chances of their customers getting done for speeding due to a speedo being a bit out. Somewhat akin to the "baker's dozen" (look up that phrase's origin if you don't know it).
They are designed to be up to 10% out. Then when your front tyre wears down, the speedo isn't UNDER reading.
Rev counters can over-read too.
Just don't worry about it. It's normal.
Speedo always overread
By law they must not read less than true speed. For that reason manufactures build in an error factor to allow to ensure they don't otherwise it's them who could he liable.
They can read 10% + 6mph high. Your mates car will overread, they ALL do.
Best 'guide' (and again it's only a guide) it those speed readers that show you your speed. They are closer to true speed than most speedos but still no 100%
And no, you can't calibrate a speedo yourself, there's no way to adjust them.
Riade past several of the 'speed readers' to get an idea but when you pass a speed trap, USE YOU SPEEDO to be safe.
Thanks for your help and clearing this up. K