As you can imagine with a tire and wheel overall diameter increase this durastic youw ill have a speedometer inaccuracy. Well i do. WHen im going 70 i am actuall doing 64-65 mph. Does anyone know the procedure to recalibrate the speedometer on a 2004 civic lx coupe? Would really appreciate the help. Thanks!

 

there is a website for it.. it was http://www.miata.some.com or something like that. it's not right, but someone should know what it is.

 

7thgencivic.com has a link to the tire calculator with the numbers for your stock tires already plugged in. otherwise just google. tire calculator

 

I don't think he is looking for a tire calculator, I think he already has the wheels and tires and wants a way to change the way the vehicle speed sensor reads.

 

if there even is a way to recalibrate the speedometer to match custom tire sizes, i'm sure a local speedometer shop could do it.

 

Yes i already have the wheels and tires and i know my speedometer at 65 mph im really going 70. I was talking to another technician at work today and he used to work for ford a while back and said that they could hold down 2 buttons on the cluster and get a formula. They marked the tire and the ground rolled the car till it got 360 degrees and counted the measurement from 1 mark to the other. They entered this into the gauge cluster and it was calibrated. Does anyone know if honda has something similar?

 

To my knowledge no one has reset the speedometer to account for tires. What tire size are you using that comes up with a 9% discrepancy?

 

i know how to fix it.. take them off

 

Get different tires.

Go here: http://www.miata.net/garage/tirecalc.html -- in fact, bookmark that site.

Give it your stock tire size, and fiddle with the 18" tire sizes until you find something that has nearly the identical circumference.

How wide are the 18's? You can fit tire widths anywhere from 205 to probably 225 on a 7"-wide rim.

Here's the thing, though... if you're going to live with those wheels and not recalibrate the speedometer, you'll probably have to use some VERY low-profile tires, and those aren't going to feel good on potholes and broken pavement.