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I changed tire dia.(larger)now abs is working all the time.(speedometer ratio problem?)

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Yes rim size does affect the mileage and speed of your vehicle. as you increase the speed your traveling at the difference in the reading on your speedometer and actually traveling at. and will cause adverse reaction from the abs. you can get some devices to recalibrate your speed whether you have a mechanical or electrical sending unit, both can be reprogrammed. Any dealership and some locally owned shops have the tools to make this fix. relatively inexpensive and can be done in just a few minutes.

Posted on Aug 06, 2010

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I have a 2007 ram 1500 with 33" nittos on 17" rims . if I do a hard reset on computer will I need to calibrate speedometer


a hard reboot of computer will only clear codes and reset to default need to flash or get a ratio change for sensor to calibrate spedo to larger tires

Jul 25, 2015 | Cars & Trucks

1 Answer

Tire size 65r16


I would say no

You have a larger dia in the 225 vs: 205
& a larger profile in the 65 vs: 55

You could have a several issues, mostly the
abs braking system, as well as the speedometer
& transmission shifting

Aug 26, 2013 | 1996 Ford Taurus

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The police officer said I was going faster than what my speedometer was saying I was doing.


Did you have stock size tires before and change it to a larger or smaller size? The change in tire size can alter the speedometer readings. Check out this website for tire size speed calibrations - http://www.roadkillcustoms.com/hot-rods-rat-rods/Speedometer-Calibration-Tire-Size-Change-Calculator.asp#axzz2ojsYwmsN

Aug 20, 2013 | 2005 Jeep Grand Cherokee

1 Answer

Want to change 14" 4


Make sure you change out the speedometer gear for the proper ratio when you do that. If you go to a larger rim and use standard tires it will effect the accuracy of the speedometer. You will have to check with the Ford dealer or specialty tire shop about that effect though. I do not recommend low profile tires on that particular vehicle. You can get 4 lug Rims for your vehicle in the sizes you are looking for but you also need to be careful that the selection you make doesn't require body modification otherwise you will have to do that first or face possible control and safety problems from the tires rubbing the body structure.

Sep 12, 2011 | 1992 Ford Mustang

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

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Can you change from a 14" tire to another size without changing anything else on the vehicle? I have a 1999 Ford Ranger with 225/70R 14 tires which I have found are really hard to find. Can I just get 15"...


You would need to have all 4 the same size. Cant mismatch sizes 1 or 2, will through off abs etc. If you change all 4 it will affect your speedometer. If larger tires put on you will actually be going slower than speedometer says. If you can live with being off say 2 to 5 mph, all is well.

Jun 15, 2010 | 1999 Ford Ranger SuperCab

2 Answers

Is there anything I could do to bring my RPM's down when Im driving in hwy. I have a 96 t100 4x4 stick, stock. At 70mph rpm is at 3300. I changed to manual hubs and that helps a little.


The only way to accomplish that is to change the axle gear ratio. Trucks are generally geared for hauling, towing, plowing, etc, so you have more torque and power at lower speeds. If you change the axle ratio,your low end performance will probably suffer (sluggish acceleration at low speed). Basically, your T100 is not designed for 70mph highway driving.

Mar 23, 2010 | 1998 Toyota T100

3 Answers

Bigger tires...


Taller tire have more centrifugal force because they have more mass (weight). A body in motion tends to stay in motion. They also have a larger outer diameter therefore through all the weight to the out side of the tire. requiring more energy to accelerate and more energy to slow down than a smaller tire at the same speeds. This is why I would recommend up graded in your brakes and also lowering your gear ratio( numerically higher) if you are going to larger tires. A lower gear ratio will act as a torque multiplier which will get you moving faster up to speed and also adjust your speedometer to be more accurate.
When you go to larger tires your speedometer will be inaccurate because taller tire have large outer diameter. A taller outer diameter tire will travel farther per revolution than a smaller tire. This cause your engine speed to be lower with taller tires because your vehicles tires are moving slower do to it larger outer diameter.
There your vehicle can be re calibrated through the computer. 4wheel parts offers parts call true speed sensors which also recalibrate your speedometer accurately that is the way i would go. Also maybe up grade to larger master cylinder off a 1 ton Chevy and go with some drill and slotted rotors. You most likely will have better braking with these upgrades than you would stock. keep it safe!

Good luck and have fun.

May 10, 2009 | 1994 Chevrolet K2500

1 Answer

Speedometer off due to tire size change and need to reset.


I dont think there is a way to reset the speedometer except installing the proper size for your particular vehicle. I made the same mistake one time . I installed larger tires deliberately ti make the car higher. It didn't work. it was rubbing against the metal when I hit a bump in the road. I had to install the proper recommended tires.

Apr 15, 2009 | Ford Explorer Cars & Trucks

1 Answer

Service Brake system flashed three seperate times over 24 hours


2 suggestions:

(1) I would suggest someone scan the ABS system for codes. I Have an '03 silverado 2500HD Crew cab, and it needs an EBCM (Electronic Brake Control Module) "ABS module". "Service Brake System" message on dash, ABS and Brake warning lamps lit as well. May be the R/F ABS wheel speed sensor, but what you described happen, shouldn't have caused damage to it.
(2) If the aftermarket rim and tire combo are larger than stock (larger overall diameter), then this may affect the way your PCM functions. You can reprogram the PCM to recognize larger diameter running gear so trans shift points and the speedometer and such can function properly.
I hope this helps.

Nov 14, 2008 | 2000 Chevrolet Silverado

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