May be a dumb question but after I put on my 245/70 16 Grabber AT2s will my speedometer be affected enough to have it recalibrated? Thanks for the help.

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-Great spirits have always encountered violent opposition from mediocre minds. -Einstein
-'07 KJ Sport
-Skink Super Sliders, Mopar Skids, Huskys, 245/70 16 Grabber AT2s, Hooks, Warholamo Rails, Black Widow Roof Rack
-Up Next: Lift?

Mine wasnt enough to worry about when I put the 245 70s on, havent even done it with the 245 75s I ran for a while or the 255 70s now, I do need to check it but I havent

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

my speedo is off by 3 mph @ 70 mph with 31.10.5's on a 15 inch rim.

speedo was off by 11 mph @ 70 mph with 265/75/r16 on moab rims.

speedo was not off at all while running 245/75/r16 on moab rims.

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2004.5 dodge qclb
smarty powered / isspros
2005 sivler lj
http://s303.photobucket.com/albums/nn13 ... ider_2008/

I have 245/70/16 BFG on mine & it's on the money, an believe me I tested it with one of those " YOUR SPEED IS " police trailer things

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PETE
ADMINISTRATOR
L.O.S.T. 4 LIFE
04 COLUMBIA ED. & 04 SPORT

I just had 247/70/16s put on and they had a little computer program that told you your new speeds at the tire shop. Each tire should have a revolution per minute number associated with it, not sure if its only based on your new diameter or weight too. They plug that number in based off your factory number and it gives you your new speed. My new tires will have me driving at 61 MPH when the speedometer reads 60 MPH....according to the computer that is. They are 29.6 inches in diameter and my stocks were 29.

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2003 Silver Sport - Debadged
245/75/R16 DuraTracs
Cragar Soft 8s
OME Coils & Front Shocks, Bilstein Rear Shocks - Muddified Lift
JBA 4.5 UCA
K&N CAI
MagnaFlow Exhaust
Rola Vortex Rack

http://www.fusion-multimedia.com

I have 245/75/16s and the speedo (pinion setting) was changed (via the body control module) by the previous owner for $100 at the dealer. It is interesting to note that the odometer did not get corrected by this change and reads 9% under. I believe that this is because on models with ABS, the odometer reading comes from the tire rotations counted by the wheel sensors and the ABS system computer.

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06 CRD LTD - Suncoast TC- Shift Kit - Spicer UJ - FRKNLIFT - F37 - Magnaflow - 22.0 City - 24@65MPH - Fumoto F-102 - AUX T Cooler - Tank Lift Pump

has anyone tried an aftermarket speedo recalibration device? I went from 2 mph under to 2.5 over with my tire change

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'03 Liberty w/3.7L & 45FRE Tranny
Revetek 2" Lift & JBA Gen 5 A-arms
Maxxis Buckshot XMT Mudders 31x10.5 on Soft 8's
Jet Stage 2 Chip : '07 Air Intake
Relocated IAT Sensor : '05 HVAC Controls
Front Hitch : EVIC from '01 GC : Custom Rock Rails
Transgo Shift Reprogramming Kit
KC Driving Lights & Aux Backup Lights
.......all GONE!

All KJ's from '02-'07 have a speedo sensor/tone ring one/in the rear diff where the speedo get's it reading from,not the ABS sensors.But it just so happens that the ABS uses that rear sensor on '02 KJ's with ABS since the rear only had drum brakes and doesn't have individual wheel sensors like the front wheels.

There's a heap on this here, You need to wade through the posts though..


http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=21020

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