Speedometer error - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-10-2010, 09:27 PM
Thread Starter
Join Date: Apr 2010
Posts: 12
Cool Speedometer error

My TJ has 16" tires and I recently installed a Garmin GPS unit. The readings between the Speedometer and GPS are as follows (speedometer reading will be first then GPS reading) 30MPH ~ 35MPH, 40MPH ~ 49MPH, 50MPH ~ 60MPH, 60MPH ~ 71MPH. I am assuming is is due to tire size. Am I right????

DCNKY is offline   Quote
Old 05-10-2010, 09:42 PM   #2
frankenbury's Avatar
Join Date: Mar 2010
Location: Emporia, KS
Posts: 138
Most likely. I assume you probably have 32" tires or so and 16" wheels. Bigger tires than stock will make your speedo show slower than you are actually going. If you go to the following link, plug in your vehicle on the top and select your tire size below it will show the speedo differences for the different tire sizes.

Tire Size Calculator - tire & wheel plus sizing

frankenbury is offline   Quote
Old 05-10-2010, 09:42 PM   #3
TJWhosYourMama's Avatar
Join Date: Feb 2010
Location: Denver, CO
Posts: 46
16" would be your wheel size. It's looking like you increased your tire size by a good amount if your speedo is off by that much. You can get a new speedo-gear to correct the discrepancy.
TJWhosYourMama is offline   Quote
Sponsored Links
Old 05-10-2010, 09:49 PM   #4
adawg38's Avatar
Join Date: Apr 2009
Location: arvada, co
Posts: 555
check partsmike.com you give them your tire size and gearing and they will hook you up with a speedo gear for $30. I went through them and they were the cheapest and most accurate speedo gears I could find.
2006 Jeep Wrangler TJ SE 2.4L(4 angry squirrels under the hood) 3.25" RC lift, 33x12.50R15 Firestone Destination AT's

RMGO "It's a Right, not a Privilege!"
adawg38 is offline   Quote
Old 05-10-2010, 09:58 PM
Thread Starter
Join Date: Apr 2010
Posts: 12

Got it.............thanks
DCNKY is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Speedometer gear help mike_b_ar YJ Tech Forum 11 05-19-2016 10:38 AM
Speedometer / tack quick fix former USMC YJ Tech Forum 0 02-13-2010 09:18 AM
Error Codes amara8 YJ Tech Forum 13 10-11-2009 07:43 PM
speedometer dosn't work..what should i check? alexcited YJ Tech Forum 5 03-20-2009 05:20 PM
Color and # of stock Speedometer gear? Yellow 30? jonbugh TJ General Discussion Forum 5 03-11-2008 05:31 PM

All times are GMT -5. The time now is 10:32 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.