Innacurate speedometer

[Circusbear]

The speedometer reading on my 83 Aero is way off. I knew I wasn't going as fast as the speedo said so Installed a bicycle speedometer and found that when the speedo reads 30mph I am actually going 25mph. When it reads 42 mph I am only going 35.

Is there a fix for this or should I just live with it?

[Wheelman-111]

Greetings:

Speedos are generally optimistic, but 20% is unexpectedly high. Are you certain the bicycle speedo is correctly calibrated?

GPS would be more convincing. The only fix is a fatter front tire, if it can fit.

[Circusbear]

Yes the bicycle speedo is accurate. I had my wife follow me and she verified my speed at different intervals.

I was able to take off the plastic cover on the speedometer and have removed the speedometer needle. I am able to install the needle at different starting positions so my plan is to install the needle so it will accurately read my top speed (36 mph). Hopefully this will bring my speedometer reading at 25 mph closer to the true reading and prevent me from getting a ticket while riding around my neighborhood.

I will tell you if that works.

[Circusbear]

Update: With trial and error I was able to reinstall the speedometer needle to a position that will give me a more accurate reading.
It is spot on at 25mph, when I am going 36 the speedo reads 37. At idle the speedometer is way below zero so at speeds below 18 it is not even close. I can live with this.

[patthesoundguy]

Update: With trial and error I was able to reinstall the speedometer needle to a position that will give me a more accurate reading.
It is spot on at 25mph, when I am going 36 the speedo reads 37. At idle the speedometer is way below zero so at speeds below 18 it is not even close. I can live with this.

Seems like a pretty good fix here where I live in Canada our slowest speed limit is 50km which is around 31mph so any speed below that wouldn't matter much to me.

[alexfleury]

I seriously doubt that any cop around where I live would give anybody a ticket on a scooter regardless of how fast you are going You do realize that you and your scooter are a VERY small target for radar to pick up? You would see him way before he could record your speed unless he was hidden pretty well!