When to change or recalibrate speedo gear

[Koenigturbo]

When you go to a different tire size in the back, When do you change or recalibrate to speedo gear.

What's height difference before you make changes in the speedo gear??

 

[mkIIIman089]

You can't change the speedometer gearing AFAIK. You MIGHT be able to if there is a drive and driven gear that will fit, but I don't know if such a thing exists - if it did, it'd be WAY more work than you'd want to do.

 

[deabionni]

There was a guy on here that was making a "ratio-box", so you could calibrate your speedometer for whatever tranny, rear end, and tire combination that you had.

I'm not sure if he's still doing it, but here's his old thread.

 

[Koenigturbo]

Yeah, just trying to find out what's the height difference between stock and aftermarket tires before the speedo is not very accurate any more..

"Meh" an second thought, Don't care any more.

 

[mkIIIman089]

Above ~50MPH I've found they aren't very accurate, period.

 

[Murd]

Not that it fixes the problem, but I use a GPS to tell how fast I'm going. Works pretty well.

 

[IJ.]

Used a ratio box for years until I ditched the mechanical speedo drive.