Speedo reading 12kph off

[alexsaccord]

I came to the realization that my cars speedo is off by 12kph. So when my speedo is reading 90kph my speed is actually 102 kph. How can I fix this?

[Sordz]

Stock size tires?

[Quashish]

Do you have larger than stock wheels? I'm used to mph but as you size up it changes I think it would read lower because yah.

[wildBill83]

195/60-R15 tires, if your not on the 14" steelies.

My guess is you have the wrong tire size on the car.

[Fleetw00d]

CB7 or CB9? USDM coupes/sedans have a 130 mph speedo, CB9 140 mph. From experience, my 140 mph speedo didn't work correctly when I had to replace the printed circuit board in the gage cluster (used one from a sedan). I don't remember whether it read high or low, but is was off by about the range you are experiencing. I had to install the 130 mph speedo from the sedan to get it to read close. Has the cluster been changed in your car?

[alexsaccord]

CB7 CAnadian car, stock wheels and tire size.

[Fleetw00d]

Has it always been off? Any work on the cluster? Have you ever changed the VSS? A little more background info might help.

[alexsaccord]

I bought the car a year ago. I never noticed it, but I started to wonder why everybody was driving below the speed limit. Come to find out I was going faster than I should be. Never did anything to the car but put on new tires and brakes. The tires are the right ones for the car.

[RyanD]

Have u tried resetting the computer? That fixed my issue after i installed a new speedo