Speedo Accuracy ( Or lack thereof)

[rocketjohn]

In the US at least, motorcycle speedos may not under-read at all, so they all are calibrated a tad fast from the factory. Of course it is within the riders liberty to make it read correctly by whatever means is at his disposal.

 

[Claviger]

Bingo!

 

[Hoffa]

I just came back from a trip and the guys and they were getting pissed when I was leading because I was going to slow, My speedo was reading 120km/hr, they say I was doing 110km/hr. How do I fix this? very annoying!

 

[warp9.9]

When my speedo says 85 I'm to busy watching for them revenue hunters to pay attention

 

[barbagris]

I just came back from a trip and the guys and they were getting pissed when I was leading because I was going to slow, My speedo was reading 120km/hr, they say I was doing 110km/hr. How do I fix this? very annoying!

Fit a GPS speedo - and know for sure.

 

[Ishrub]

I just came back from a trip and the guys and they were getting pissed when I was leading because I was going to slow, My speedo was reading 120km/hr, they say I was doing 110km/hr. How do I fix this? very annoying!

Go faster!

 

[motolink]

My speedo was reading about 8 kph faster than I was actually going but that corrected itself when I fitted the taller Bridgestone to the rear.

 

[1olbull]

I just came back from a trip and the guys and they were getting pissed when I was leading because I was going to slow, My speedo was reading 120km/hr, they say I was doing 110km/hr. How do I fix this? very annoying!

TWIST the RIGHT SIDE BAR END!!!

 

[barbagris]

In the US at least, motorcycle speedos may not under-read at all, so they all are calibrated a tad fast from the factory. Of course it is within the riders liberty to make it read correctly by whatever means is at his disposal.

Same in Europe.

Recalibrating is however a bit of a grey area. I know personally of two cases in different countries where recalibrating a speedo via something like TuneECU was treated as tampering as altering the speedo affected the odometer which therefore affected the vehicle mileage. One ended with a considerable fine. The other was forced to have it reset at a dealer who charged of course. Both Cars btw.

True in both cases they were unlucky to get caught.

The Speedo depends entirely on the rolling circumference of the tyre - so as it wears the calibration changes anyway. So personally my take is leave it be. If you're in an area with speed controls you know you're under indicated speed (safe) - If not who cares. If you REALLY want to know how fast you are - Fit something independent that does not rely on the vehicle ECU and maybe even logs the data. Most Mobile phones can deliver something. Personally I'd forgo the logging as there is legal precedent for it being used to prove infraction.

Ages ago I fitted a GPS device (blue numbers) as I could not see the OEM clocks at night - my eyes simply cannot distinguish the numbers (yellow) or needle(red) position - Turns out it is a form of colour blindness/sensitivity. In good light I find blue hues uncomfortable to look at and can even have difficulty to focus on some Blue LEDs . I know the OEM speedo is close to correct as I have an E-Max on the rear . But If I get an "official" tail - I always glance at the GPS.

 

[Rocket HP]

Hi all,
I get the feeling my 2010 Roadster's speedo is somewhat optimistic.
Sitting on 3 grand on the tacho on mine is an indicated 125 or so kmh. At that speed I'm only travelling marginally faster than most cars on the freeway.
My old Garmin Nüv gps continually reads about 5 to 8 kmh slower than the speedo indicates.
Is that about right?

Take it to some on that can recalibrate it or any one with a dino can do it