Question about 1999 Ford Contour

1 Answer

Went up in tire size now speedo is off - 1999 Ford Contour

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 287 Answers

You can go to Ford give them your vin# and tire size and a mechanic should be able to figure out what pick up,sensor or gear you need to make it accuracte. The easy and quick way is to buy a GPS unit and it reads your true speed.That is how we use to check speedo calibration. Mount the GPS and use it for the speedo. Most Fords are about 3 MPH off from the factory anyway.

Posted on Apr 20, 2013

Testimonial: "thanks I have done the first along with a tire size calculation and came up with the same at 80mph doing 75, but I have not tried the second one which I will do on Monday when ford is open, and I really appreciated the advice it was helpful! "


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I got a 1998 SVT cobra my speedometer seems to be reading 10 mph faster than what I'm going what would cause that ? at highway speeds it says 80mph when going 70 just bought the car

check rim sizes and tires fitted as they may be smaller than the speedo sender is gear ed for
smaller dia. tires = faster speedo reading as the speedo reads off drive shaft speed

Jan 24, 2016 | Cars & Trucks

1 Answer

Why speedometer problems car runs faster than speed on speedometer?

Since the diagnostic shows good, it's a physical problem. Check that tire size is correct for the vehicle. Too large will slow the speedo. Tires too small will increase the speedo.

Aug 07, 2014 | 2005 Volkswagen Jetta Sedan

1 Answer

I have a1998chevy 1500 speedometer is 10 mph off any ideas why?thanks

It probably has something to do with the tires. Does it have the original size tires on the truck? If so then maybe someone had changed the speedo gear when they had bigger or smaller size tire on the truck.

Oct 18, 2013 | 1992 Isuzu Trooper

1 Answer

Original tire size is 215/65r16 can i replace this with a tire size of 235/65r16, this is for toyota sienna sienna ce 2004

You can do this but i do not recommend it because the tire diameter is much bigger, this throws off the speedo reading and affects the transmission operation. Contact the and see what tire sizes you can use that might be bigger (wider tread foot print) but with the same diameter.

Jun 14, 2012 | 2006 Toyota Sienna

4 Answers

Do oversized tires alter the speedometer. The speedometer stated i was going 65 and the state police clocked me at 79 mph.

Most certainly does
You need a different gear in the trans or transfer case,that drives the speedo
Now if the speed sensor is the output,then you will need help. I personally do not know, if a scan tool can reprogram the ecm/bcm etc, to correct for the tire change.

Ask that question next.

Nov 05, 2010 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

What tires can fit a 1999 ford expedition xlt

I believe it will fit. If you go to you can use their site for alternate tire sizes. Especially handy is the feature which shows you the Speedometer error for different size tires. The site will also show you recommended and popular substitute tire and wheel sizes.

The 1999 model had a 265/65/17 as an alternative. You may want to ask the Tire store you intend to use if they can reconfigure your Speedo to be accurate. Some of the Fords can be done electrically without changing Speedo gears.

I did something similar by going from a "60" series to a "65" series in the same width. On my Grand Marquis, I gained 5% mileage improvement, but have to watch Speedo until I get it reconfigured. I hope this helps to answer your questions.

Jul 26, 2010 | 1999 Ford Expedition

1 Answer

I currently have factory 17" rims and 245/70 tires and would like to upsize and wondered if the xtr package 18" chrome rims and 275/65 tires would cause problems with speedo or have clearance problems in...

to be straight forward! the size of the rim/tire will not affect speedo tran ect ! the speedo is on the trans ! the truk will register correctly! speed that is

Apr 17, 2010 | 2009 Ford F-150

1 Answer

Tire size for a 96 cavalier

The factory recommended tire size is usually on a sticker on the drivers side door post and in the owners manual. This will keep the speedo calibration correct. If you are customizing the car then you need to go to a tire shop and work with them to determine what sizes will do what you want. You can buy different tire size rims with various offsets that allow for larger tires to be put on a vehicle. Hope this helps, RAC

Apr 13, 2009 | 1996 Chevrolet Cavalier

1 Answer

Tire size for mitsubishi outlander

Here's a good tire calculator and it gives you the speedo changes etc.

Tire calculator

Mar 24, 2009 | 2006 Mitsubishi Outlander

1 Answer

Have changed tire size from 15 31 10.5 to 15 235 and have a 7mph error on speedometer

You are wanting to correct the speedo?

the toyota dealer should be able to reflash the computer for your tire size and this will correct the speedo
or you can buy a programmer like a hypertech or superchips most of the power programmers give you option for tires

Sep 22, 2008 | Toyota Tacoma Cars & Trucks

Not finding what you are looking for?
1999 Ford Contour Logo

Related Topics:

98 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers


Level 3 Expert

5537 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides